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WO1994000977A1 - Procede de transformation d'une monocotyledone - Google Patents

Procede de transformation d'une monocotyledone Download PDF

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Publication number
WO1994000977A1
WO1994000977A1 PCT/JP1993/000925 JP9300925W WO9400977A1 WO 1994000977 A1 WO1994000977 A1 WO 1994000977A1 JP 9300925 W JP9300925 W JP 9300925W WO 9400977 A1 WO9400977 A1 WO 9400977A1
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Prior art keywords
gene
tissue
agrobacterium
plant
cultured
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PCT/JP1993/000925
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English (en)
French (fr)
Inventor
Yukou Hiei
Toshihiko Komari
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Japan Tobacco Inc
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Japan Tobacco Inc
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Priority to DK93914958T priority Critical patent/DK0604662T3/da
Priority to DE69334225T priority patent/DE69334225D1/de
Priority to US08/193,058 priority patent/US5591616A/en
Priority to AU45134/93A priority patent/AU667939C/en
Priority to EP93914958A priority patent/EP0604662B1/en
Publication of WO1994000977A1 publication Critical patent/WO1994000977A1/ja
Priority to CA002121545A priority patent/CA2121545C/en
Anticipated expiration legal-status Critical
Priority to US09/229,324 priority patent/US7060876B2/en
Ceased legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12NMICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N15/00Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
    • C12N15/09Recombinant DNA-technology
    • C12N15/63Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
    • C12N15/79Vectors or expression systems specially adapted for eukaryotic hosts
    • C12N15/82Vectors or expression systems specially adapted for eukaryotic hosts for plant cells, e.g. plant artificial chromosomes (PACs)
    • C12N15/8201Methods for introducing genetic material into plant cells, e.g. DNA, RNA, stable or transient incorporation, tissue culture methods adapted for transformation
    • C12N15/8202Methods for introducing genetic material into plant cells, e.g. DNA, RNA, stable or transient incorporation, tissue culture methods adapted for transformation by biological means, e.g. cell mediated or natural vector
    • C12N15/8205Agrobacterium mediated transformation

Definitions

  • the present invention relates to a method for transforming a monocotyledonous plant.
  • methods for transforming monocotyledonous plants include the electoral poration method, the polyethylene glycol method (PEG method), the particle gun method, and the like.
  • the electoral poration method is a method in which protoplasts and the target DNA are mixed, and DNA is introduced into cells by making holes in the cell membrane by electrical stimulation, thereby effecting transformation.
  • various genes have been introduced into monocots, especially rice, by this method (Toriyama R. et al., 1988; Bio / Technol. 6: 1072-1074, Shimamoto R et al., 1989; Nature 338: 274-276, Rhodes CA et al., 1989; Science 240: 204-207).
  • this method is only applicable to 1) plant species for which an individual regeneration system from protoplasts has been established.2) It takes several months to regenerate individuals from protoplasts. 3) Since the cultivation period is prolonged, the frequency of culture mutation accompanying the cultivation period increases, and the probability of obtaining normal transformants decreases.
  • the PEG method is a method of introducing a gene by mixing a target gene and protoplast and treating with a PEG, and differs from the electroporation method in that electrostimulation is changed to PEG.
  • the introduction efficiency is considered to be somewhat lower than the electoral port method.
  • transformants obtained by this method, they have not been widely used. Since protoplasts are used, they have the same problems as the electroporation method (Zhang W. et al., 1988; Theor. Appl. Genet. 76: 835-840, Datta SR et al., 1990; Bio / Technol 8: 736-740).
  • the particle gun method is a method in which a target gene is attached to fine metal particles, and transformation is performed by driving the metal particles into cells or tissues at a high speed. Therefore, in principle, any tissue can be transformed, and in particular, It is effective for plant species for which a regeneration system from protoplasts has not been established. Transformation efficiency depends on selection after gene transfer. There are no data comparing the efficiency with the electroporation method (Gordon-Ka Kan WJ et al., 1990; Plant Cell 2: 603-618, Fromrn ME et al., 1990; Bio / Technol. 8: 833-839). , Christou P. et al., 1991; Bio / Technol. 9: 957-962).
  • the gene transfer method using the Ti plasmid of the genus Agrobacterium as a vector is widely used as a transformation method for dicot crops such as tobacco, petunia, and rape.
  • the host of the bacteria belonging to the genus Agrobacterium is limited to dicotyledonous plants only and is not infested by monocotyledonous plants (De Cleene M.
  • Gould J. et al. (1991; Plant Physiol. 95: 426-434) is a highly virulent agrobacterium harboring the kanamycin resistance gene and the GUS gene after incising the corn stump with a needle. EHA1 was inoculated and the shoot apical tissue after the treatment was selected with kanamycin to obtain a resistant plant. Southern analysis confirmed that some of the progeny seeds had the introduced gene (chimerism).
  • the electoporation method is the mainstream for gene transfer in grass crops.However, since protoplasts are used, it takes a long time to obtain a regenerated plant, which requires a great deal of labor, and There is a risk that mutants will appear frequently in culture. In addition, this method cannot be applied to crops for which a regeneration system from protoplasts has not been established, for example, corn. Therefore, as described above, it has been attempted to use a growth point tissue for corn (Gould J. et al., 1991). However, the work of isolating the growing point requires a lot of labor, and it is not always easy to prepare it in large quantities.
  • an object of the present invention is to provide a universal method for a plant in which the time from transformation to regeneration of a plant is shorter than that of a conventional method and a plant regeneration system from protoplasts has not been established.
  • Another object of the present invention is to provide a method for transforming monocotyledonous plants which can be easily applied to a plant.
  • the inventors of the present application have conducted intensive studies on the effects of monocotyledonous plant tissues treated with agrobacterium, treatment conditions of agrobacterium, and the structure of a binary vector on the gene transfer efficiency.
  • the present inventors have found that cultures of cotyledon plants can be transformed with remarkably high efficiency and reproducibility using bacteria of the genus Agrobacterium, and that the above object can be achieved according to this finding.
  • the invention has been completed.
  • the present invention comprises transforming a cultured tissue or a dedifferentiated cultured tissue in the process of dedifferentiating a monocotyledonous plant with a bacterium belonging to the genus Agrobacterium containing a desired gene.
  • a method for transforming a plant is provided.
  • the method of the present invention it has become possible for the first time to introduce a target foreign gene with good reproducibility into monocotyledonous plants such as grasses such as rice, maize, wheat, and wheat. Transformation methods for monocotyledonous plants using agrobacterium are not yet established as described above.
  • a cultured tissue that has not been used so far is subjected to the method improved by the present invention. By inoculating pum, the gene could be introduced very easily.
  • a cultured tissue such as a callus, which can be easily prepared, is used, a test material can be easily obtained as compared with a conventional technique using a growth point.
  • the cultured tissue is transformed, the time required for plant regeneration is shorter than in the case of transforming protoplasts, and the frequency of mutation is reduced.
  • the use of a super binary vector has made it possible to introduce a gene with high efficiency into a variety that is difficult to culture, such as some rice varieties.
  • the chimera phenomenon in which the target gene is introduced in a chimeric manner can be reduced.
  • FIG. 1 shows the structure of PT0K162 which is an example of a plasmid contained in a bacterium belonging to the genus Agrobacterium which can be used in the method of the present invention, and the method of constructing the plasmid PTOK232 used in Examples of the present invention.
  • FIG. 1 shows the structure of PT0K162 which is an example of a plasmid contained in a bacterium belonging to the genus Agrobacterium which can be used in the method of the present invention, and the method of constructing the plasmid PTOK232 used in Examples of the present invention.
  • FIG. 1 shows the structure of PT0K162 which is an example of a plasmid contained in a bacterium belonging to the genus Agrobacterium which can be used in the method of the present invention, and the method of constructing the plasmid PTOK232 used in Examples of the present invention.
  • FIG. 1 shows the structure of PT0K162 which is an example of a
  • the monocotyledon transformed by the method of the present invention is not particularly limited, and can be applied to any monocotyledon such as rice, maize, wheat, wheat, asparagus, and the like.
  • the cultured tissue used in the method of the present invention is a cultured tissue or a dedifferentiated cultured tissue in the process of dedifferentiating a monocotyledonous plant.
  • the culture tissue in the dedifferentiation process is a tissue obtained by culturing an explant in a medium containing a plant growth regulator such as auxin and cytokinin, and a callus and an adventitious embryo-like tissue are formed.
  • Pre-stage tissue means dedifferentiated cultured tissue means callus and adventitious embryo-like tissue obtained by culturing explants on a medium containing plant growth regulators such as auxin and cytokin. I do.
  • the cultured tissue used in the present invention may be derived from any site, and examples thereof include those derived from scutellum, shoot apex, radicle, immature embryo, pollen and ul.
  • As the cultured tissue used in the present invention it is preferable to use a cultured tissue, or a callus and an adventitious embryo-like tissue, which are in a callus forming process after 7 days or more after explants are placed on a dedifferentiation induction medium. Among them, it is most preferable to use callus and adventitious embryo-like tissue as a cultured tissue.
  • the dedifferentiation induction medium is in this field For example, the main inorganic salts and vitamins of N6 medium (Chu CC 1987; Proc. Symp.
  • Plant Tissue Culture Science Press Peking, PP. And LS medium (Linsmaier, E., and Skoog, F. 1965; Physiol. Plant 18: 100-127) supplemented with lgZl casamino acid, 30 g / l sucrose and 2 gZl gellite A medium containing 100 mg / 1 casamino acid, 70 OmgZ 1 proline, 1.5 mg / l 2,4-D, 208 sucrose, and 2.3 gZ 1 gellite added to vitamins can be used.
  • the cultured tissue used in the method of the present invention does not necessarily need to be callus, and may be suspension cells.
  • bacteria belonging to the genus Agrobacterium used for transformation those conventionally used for transformation of dicotyledonous plants can be used. Many of these have a vector containing a DNA region derived from the virulence region (vir region) of the Ti frasmid derived from Agro bacterium tumefaciens, and the gene responsible for the trait to be imparted to the plant is contained in this vector. It is inserted or present in a separate plasmid from this vector, and is introduced into Ti plasmid in vivo by homologous recombination or the like.
  • Agrobacterium tumefaciens A281 a highly pathogenic strain with extremely high transformation efficiency
  • This plasmid is A plasmid called pT0K154 capable of growing in Enterobacteriaceae and Agrobacterium tumefaciens (a T region constructed from a known PGA472 plasmid derived from a Ti plasmid and a known broad host range plasmid called pVCKlO1 by the method described below).
  • the plasmid contains the previously cloned 15.2 kilobase Kpnl fragment (including virB, virG, and virG genes) derived from the virulence region of pTiBo542.
  • a kanamycin resistance gene is arranged as a gene to be introduced into monocotyledonous plants between the two border sequences of the T region, and in this example, the gene power SpTiBo542 to be introduced into monocotyledonous plants is This is an example in which it is located on a plasmid containing a cloned DNA fragment derived from the virulence region.
  • FIG. 1 Each symbol in FIG. 1 has the following meaning.
  • the desired gene to be integrated into the monocotyledonous plant can be integrated into a restriction enzyme site in the T region of the plasmid by a conventional method, and is selected based on an appropriate selection marker such as drug resistance of the plasmid. be able to.
  • an appropriate selection marker such as drug resistance of the plasmid.
  • homologous recombination in an in vivo system in Agrobacterium tumefaciens cells (Herrera-Estrella L. et al., 1983; EMBO J.
  • pT0K162 is introduced into Agrobacterium tumefaciens, and a plasmid called PBR322 (including a similar plasmid) into which the desired DNA has been further introduced is introduced into this bacterium. Since the DNA of PT0K162 has a portion homologous to PBR322, the pBR322 derivative will be incorporated into PT0K162 by recombination via homologous sequences.
  • pBR322 cannot replicate in Agrobacterium tumefaciens, unlike pT0K162, it cannot survive in Agrobacterium tumefaciens without such an integrated state (pT0K162:: pBR322 derivative). Then, if selection for specific properties to each of PT0K162 the pBR322 derivative (drug resistance, etc.), pT0K162:: it is possible to obtain the Agrobacterium tumefaciens with pBR322 2 ⁇ body.
  • transposon Tn7 (De Greve HH et al., 1981; Plasmid 6: 235-248) was one of the selection markers for PBR322 derivatives.
  • the derived spectinomycin resistance gene (SP) was found to be superior. Therefore, if the desired gene has already been cloned into pBR322, inserting the SP gene into the plasmid will introduce the desired gene into the T region of pT0K162 by homologous recombination in Agrobacterium tumefaciens. can do.
  • a method is also conceivable in which a plasmid composed of the DN ⁇ and SP genes derived from PBR322 is prepared and the desired gene is inserted into this plasmid.
  • the border sequence of the T region it is possible to finally arrange the kanamycin resistance gene and the desired gene in separate T regions on PT0K162.
  • both T regions can be introduced at a considerable ratio, so that the target gene can be sufficiently introduced.
  • both T regions may be integrated into separate chromosomes, it becomes possible to separate the target gene from the kanamycin resistance gene later.
  • the desired gene to be introduced into a monocotyledonous plant is not limited in any way, and includes any gene capable of imparting desired properties.
  • any gene capable of imparting desired properties for example, to confer herbicide resistance gene, antibiotic resistance gene, virus disease resistance
  • the present invention is not limited thereto.
  • the host Agrobacterium belonging to the genus Agrobacterium is not particularly limited, but Agrobacterium tumefaciens can be preferably used.
  • a procedure for introducing a plasmid into a bacterium belonging to the genus Agrobacterium such as Agrobacterium tumefaciens can be performed by a conventional method.
  • a three-system hybridization method for bacteria DiUaG. Et al., 1980; Pro Natl. Acad Sci. USA 77: 7347-7351).
  • the bacteria of the genus Agrobacterium prepared in this way contain DNA having a high virulence ability derived from PT0K162, it is possible to transform monocotyledons with high efficiency.
  • the gene to be introduced into a monocotyledonous plant is, as in the prior art, a bacterium belonging to the genus Agrobacterium, which is located between the border sequences of the T region. i It may be located on a plasmid or on another plasmid.
  • a method for transforming a cultured tissue of a monocotyledonous plant with a bacterium belonging to the genus Agrobacterium can be carried out by simply contacting the cultured tissue with a bacterium belonging to the genus Agrobacterium.
  • a cell suspension of Agrobacterium genus having a cell concentration of about 106 to 1 cell Zm 1 is prepared, and the cultured tissue is immersed in the suspension for about 3 to 10 minutes.
  • the above can be performed by co-culturing for several days.
  • transformation can also be performed by adding a bacterium belonging to the genus Agrobacterium to the culture solution of the cultured tissue and co-cultivating it.
  • the cultured tissue can be subjected to transformation without performing pretreatment such as enzymatic treatment or damage.
  • the transformed cells or the transformed tissue be selected in the dedifferentiation process or the dedifferentiated state. This is achieved by culturing the cultured tissue in a medium containing plant growth regulators such as auxin and cytokinin, and adding a selectable marker such as hygromycin and an antibiotic against Agrobacterium bacteria. It can be carried out.
  • the selected cells or tissues can be subjected to redifferentiation culture by a known method. This Thereby, a plant that has obtained a desired trait by transformation can be regenerated.
  • the present invention will be described more specifically based on examples. However, the present invention is not limited to the following examples.
  • Ripe rice seeds are disinfected by soaking them in 70% ethanol for 1 minute and 1% sodium hypochlorite for 30 minutes. Then, 2N6 solid medium (N6 inorganic salts and vitamins (Chu CC 1978; Proc. Symp Plant Tissue Culture, Science Press Peking, PP.43-50), lg / 1 casamino acid, 2 mg / 2,4-D, 30 g / l sucrose, 2 g / l gellite). On the fourth day after placing the ripe seeds, the scutellum was excised from the seeds and used as a scutellum. After the mature seeds were cultured for about 3 weeks, the formed callus derived from the scutellum was transplanted to a 2N6 medium, and the callus 4-7 days old was used as the scutellum callus.
  • 2N6 solid medium N6 inorganic salts and vitamins (Chu CC 1978; Proc. Symp Plant Tissue Culture, Science Press Peking, PP.43-50),
  • N6 solid medium (12 amount of major inorganic salts and trace salts of N6, N6 vitamins, lgZl casamino acid, 20gZl sucrose, 2 gZl gel light), and 3 to 3 mm of tissue including apical split tissue was cut out from the seedling after 3 days of culture and used as a material.
  • the tip of the seed root was cut out 5 to 10 mm from the seedling obtained by the method (iii) to obtain a material.
  • calli obtained by culturing these radicles on a 2N6 solid medium for about 2 weeks were used as radicle calli.
  • the callus derived from the scutellum obtained by the method (ii) was converted into an AA liquid medium (AA major inorganic salts, AA amino acids and AA vitamins (Toriyama and Hinata 1985; Plant Science 41: 179-183, MS trace salts (Murashige and Skoog 1962; Physiol. Plant.15: 473-497), 0.5 g / 1 casamino acid, l mg / 1,4-D, 0.2 mg / 1 strength ricetin, 0.1 mg / 1 gibberellin, (20 gZl sucrose) and shaken at 120 rpm in the dark at 25 ° C. to obtain suspension-cultured cells. The medium was updated every week.
  • Ti plasmid binary one vector one
  • the following plasmids were prepared by incorporating the hygromycin resistance gene (HPT) and the / 5-D-glucuronidase (GUS) gene into the T-DNA region of Ti plasmid.
  • HPT hygromycin resistance gene
  • GUS 5-D-glucuronidase
  • pIG121 Hm Plasmid ligated to the GUS gene containing the first intron of the castor catalase gene and the hygromycin resistance gene (Nakamura et al., 1991; Plant Biotechnology II (Hyundai Chemical Special Edition, PP.123 -132), obtained from Nagoya University, Nakamura).
  • the C1aI fragment (2.5 kb) containing the spectinomycin resistance gene derived from ⁇ 7 was blunt-ended by Klenow treatment, and this was inserted into the SmaI site of pUC19 to obtain ampicillin and spectinomycin resistance.
  • a plasmid P TOK107 (5.2 kb) having a sex gene was obtained.
  • pT0K107 was treated with EcoRI and Hindlll, and the 2.51) fragment containing the spectinomycin resistance gene was digested with the 0482 EcoRI and Hindlll fragment (2. 7 kb) to obtain pTOK170 (5.2 kb) containing a spectinomycin resistance gene and HindIII and HpaI sites.
  • the vector PIG221 (Ohta S. et ah, 1990; Plant Cell Physiol. 31: 805-813, transferred from Nagoya University, transferred from Nakamura, Nagoya University) in which the first intron of castor catalase and the GUS gene are linked to the 35S promoter. After digestion with RI, the ends were blunt-ended with Klenow enzyme, and Hindyl linker (pCAAGCTTG; Takara Shuzo Co., Ltd. 4660P) was introduced. A fragment containing the 35S promoter and the intron GUS was cut out with Hindill, and Hindlll of plasmid pGL2 (obtained from J.
  • pGL2-IG 7.6 kb
  • pGL2 is expressed in pDH51 (Pietrazak et al., 1986; Nucleic Acids Research 14: 5857-5868) by the hygromycin resistance gene (Gritz L. and Da vis J. 1983; Gene 25: 179-188).
  • the fragment obtained by treating pTOK170 with HpaI was ligated with the Pvul fragment of pGL2-IG (5.2 kb) to obtain PTOK229 (10.1 kb).
  • Super binary vector obtained by inserting VirB, virC, and ⁇ irG genes derived from strongly pathogenic Agrobacterium A281 into a binary vector The introduction of the sex gene, intron GUS gene) was performed by homologous recombination. That is, since both vectors have a site derived from Escherichia coli plasmid pBR322, it is necessary that the strains selected by spectinomycin and kanamycin contain only plasmids produced by recombination of both plasmids. become.
  • the plasmid in which the hygromycin resistance gene and the intron GUS gene have been integrated into the super binary vector is called ⁇ 232 (see FIG. 1).
  • LBA404 and EHA101 strains with the T-DNA region deleted were used as host bacteria.
  • LBA404 is a bacterial strain having a helper plasmid (completely having a vir region) PAL4404, and is available from the American Type Culture Collection (ATCC 37349).
  • EHA101 is derived from Hood E. E. et al. 1986, in which the vir region of the helper plasmid is derived from the strongly virulent Agu paclidium A281.
  • the shoot apex tissue was made of N6S3 solid medium (1/2 N6 major inorganic salts, N6 trace salts, N6 vitamins, Chu CC1978, 100 M acetociringone, lOg / 1 glucose, 20 g / 1 sucrose.
  • N6S3 solid medium 1/2 N6 major inorganic salts, N6 trace salts, N6 vitamins, Chu CC1978, 100 M acetociringone, lOg / 1 glucose, 20 g / 1 sucrose.
  • AA amino acids (Toriyama and Hinata 1985), 1 g / 1 casamino acid, 0.2 mg NAA, 1.0 mg / 1-strength ricetin, 3 gZl gellite) and other cultured tissues such as scutellum callus include acetociringone, glucose, and sucrose.
  • the cells were transferred to a 2N6 solid medium containing the same concentration, and cultured at 25 ° C in the dark for 2 to 5 days. Thereafter, the inoculated tissue was washed with sterilized water containing 250 mg / 1 cefotaxime, and cultivation was continued in each solid medium containing the same concentration of cefotaxime.
  • a tissue Immediately after the co-culture treatment, the tissue was immersed in 0.1 M phosphate buffer (pH 6.8) containing 0.1 Triton X-100, and allowed to stand at 37 ° C for 1 hour. After washing and removing the agrobacterium with a phosphate buffer, a phosphate buffer containing 0.1 mM 5-promo 4-chloro-3-indolyl y5-D-gluconic acid (X-glute) and 20% methanol is added. Was added. After treatment at 37 ° C. for 24 hours, a tissue exhibiting a blue color was observed under a microscope, and expressed as a percentage of the number of test tissues.
  • 0.1 M phosphate buffer pH 6.8
  • Triton X-100 Triton X-100
  • leaf pieces were collected from the plant and subjected to GUS staining according to the same method. Positive individuals were those in which the whole leaf piece or the cut end of the leaf piece was uniformly colored blue, and chimera individuals were those that exhibited a chimera-like expression.
  • the obtained resistant tissue was further added to an N 6-12 medium containing 5 Omg / 1 hygromycin (N 6 inorganic salts, N 6 vitamins, 2 gZl casamino acid, 0.2 mg / 12, 4-D, 0.5 mg / 16 BA, 5 mg / 1 ABA, 30 gZl sorbitol, 20 g / 1 sucrose, 2 gZ 1 gellite) for 2 to 3 weeks (second selection), callus grown on this medium was reduced to 0, 20 Was transferred to N6S3, an individual regeneration medium containing 5 Om1 hygromycin.
  • 25 OmgZ1 cefotaxime was added to all the media after co-culture.
  • the suspension cultured cells co-cultured for 5 days were cultured in a 2N6 medium containing 25 Omg / 1 cefotaxime for 1 week, and then transformed cells were selected in a 2N6 medium containing 5OmgZl hygromycin.
  • the seeds of the transformed next generation were sown in a 400-fold aqueous solution of Homai wettable powder containing 7 Omg / ⁇ hygromycin, treated at 25 ° C for 10 days, and examined for hygromycin resistance.
  • seeds of the transformed next generation were seeded in 20 seeds each, and leaf pieces were collected from seedlings about 3 weeks later, and the expression of GUS gene was examined.
  • Agrobacterium with a strongly pathogenic Vir region is resistant to hygromycin in EHA101.
  • Bacteria transfected with the binary vector pIG121Hm (described above) having the gene and the GUS gene were treated on various tissues of the rice cultivar Tsukihikari, and the GUS activity was investigated after coculture. Test tissues are shoot apex, radicle, scutellum, radicle callus, scutellum callus and suspension cultured cells. When not treated with agrobacterium, none of the materials exhibited blue GUS expression.
  • a force gene which is a tissue containing a growth point
  • the gene must be introduced to a limited number of growth points in order for resistant tissue to grow.
  • a large number of genes were introduced into the shoot apices, but no resistant tissue was obtained.This is because the probability of introduction into the vicinity of the growing point is low. Conceivable.
  • Transformed cells were obtained in scutellum callus and suspension culture cells, which are culture tissues derived from the scutellum of the ripe seeds, whereas proliferation of resistant cells was not observed in the scutellum. Furthermore, according to the method of Raineri et al. (1990), gene transfer was attempted using the injured scutellum as a test tissue, but no improvement in gene transfer efficiency was observed, and transformed cells were obtained. Did not. In contrast, when scutellum callus was used as the test tissue, transformed cells were obtained with good reproducibility and high frequency without the need for treatment such as scratching. From these facts, it is judged that a cultured tissue in a dedifferentiated state or in a dedifferentiation process is suitable as a test tissue for transformation with an agrobacterium. Table 2 Efficiency of appearance of transformed tissues and cells depending on the test materials
  • EHA101 has the Vir region of a strongly pathogenic agrobacterium A281 in helper plasmid.
  • LBA4404 has a normal vir region.
  • LBA4404 (PT0K232) has a part of the vir region of the strongly pathogenic agrobacterium A281 in a force binary vector in which the Vir region of helper plasmid is a normal type. This binary vector was derived from pTOK 162, and LBA4404 ( ⁇ ⁇ 0 ⁇ 162) enabled extremely high transformation of difficult-to-transform plant species among dicotyledonous crops (Saito Y. et al. 83, 679-683).
  • the presence or form of the highly virulent vir region can significantly affect the efficiency of transformation.
  • the transfection efficiencies for the expression of the GUS gene were compared using the above three types of agrobacterium that differed in the strongly pathogenic Vir gene.
  • the test materials were Koshihikari and scutella callus of the moonlight.
  • LBA4404 Virulent V ir no region LBA4404 (P IGI21Hm) even both cultivars tissue exhibiting GUS activity was observed, but the rate was bought and low about 30% in Koshihikari.
  • EHA101 pIG121Hm
  • LBA4404 pT0K232
  • LBA4404 which has a virulent Vir in the binary vector, showed GUS activity in more than 95% of tissues in Koshihikari as well as in moonlight (Table 3). Furthermore, regarding the area of the blue region in each tissue showing GUS activity, it was observed that LBA4404 (4040 ⁇ 232) had the largest and the highest transduction rate.
  • LBA4404 ( ⁇ 0 ⁇ 232) was the highest in terms of the emergence rate of resistant plants, and there was no difference between the cultivars in the selection rate of resistant calli (Table 4). The selection rate is low for the two strains, LBA4404 (pIGl 21Hm) or EHA101 (pIG121Hm), and the appearance of hygromycin-resistant calli in Koshihikari, which is difficult to culture, is about 2%. Stayed. Therefore, LBA4404 (pTOK232), which has a part of the highly virulent Vir gene in the binary vector, was determined to be the best agrobacterium used for rice transformation. You.
  • the obtained transformant showed normal growth when cultivated in a greenhouse, and no individual showing tetraploid or malformation from the appearance was observed.
  • seed fertility some individuals showed partial sterility / complete sterility, but most individuals showed almost normal fertility.
  • the transgene in the current generation of the transformant was detected by the Southern method using the HPT gene as a probe.
  • the presence of one to several copies of the transgene was observed in all the tested individuals (Tables 8 and 9).
  • the HindlH fragment containing the HPT gene was 5.5 Kb, whereas the band of about 6 Kb or more was observed in all the transformants tested. This confirms that T-DNA was integrated into the plant chromosome.
  • the fact that the lengths of the detected DNA fragments differed from one individual to another indicates that the sites where the gene was introduced into the rice chromosome were different from each other. It was confirmed that it was not a thing.
  • Transformation lines 112 and 3-2 of “Morning Light” in Table 8 indicate that the presence of transgenes of two or more factors is presumed from the segregation ratio, but the results of Southern analysis are also compatible with the two-factor separation. I was The presence of two copies of the transgene was confirmed in the transformed individuals 2-1 in Table 8, but one of these bands was a fragment shorter than 5 Kb, and the T-DNA was incomplete. It is presumed to have been incorporated in the form. Therefore, it is considered that this individual showed one factor-like separation of hygromycin resistance in the next generation.
  • Table 9 shows that many of the "Moonlight" transformed lines have resistance to hygromycin in the next generation
  • One factor-like segregation was shown for sex and GUS gene expression.
  • recent Southern analysis showed multiple copies, except that some individuals had one copy.
  • GUS-positive, GUS-negative, and hygromycin-resistant individuals were determined for two lines of the next generation, 18a and 16c, where the transgene was one copy and two copies, respectively. was tested for two individuals, and Southern analysis was performed. As a result, the same band as that of the individual at the time of the transformation was detected in all the individuals except for the GUS-negative individuals, indicating that the transgene was inherited in the transformed next generation.
  • Corn varieties A188, Fl (A188 x Black Mexican Sweet), Fl (A188 x B73Ht), Fl (B73Ht x A188) and Fl P3732 were selected as materials.
  • A188, Black Mexican Sweet, and B73Ht were obtained from the Ministry of Agriculture, Forestry and Fisheries, and P3732 was obtained from the Iwata Dairy Cooperative.
  • Ripe seeds were immersed in 70% ethanol for 1 minute and in sodium hypochlorite for 5 minutes. After washing three times with sterile water, LS solid medium (Linsmaier and Skoog inorganic salts and Mins; Linsmaier, E. and Skoog, F. 1965; Physiol. Plant 18: 100-127, 10 O mg / 1 casamino acid, 700 mg / l proline, 20 g / 1 sucrose, 2.3 g / 1 gel light ). After culturing at 25 ° C in the dark for 4 days, about 0.1 X 0.3 thigh tissues including apical meristem were cut out from the germinated seedlings and subjected to the following experiments.
  • Immature embryos were cultured on LSD 1.5 solid medium (Linsmaier and Skoog inorganic salts and vitamins, 100 mg / l casamino acid, 700 mg / l proline, 1.5 mg / l 2,4-D, 20 g / l sucrose, 2.3 g / l gel light). After culturing for 3 weeks, the formed scutellum-derived calli were subjected to the following experiments.
  • LBA404 pTOK232
  • EHA101 pIG121Hm
  • Agrobacterium colonies cultured on an AB medium containing hygromycin (50 mg / l) and kanamycin (50 mg / l) for 3 to 10 days were scraped with a platinum loop, and the modified AA medium described in Example 1 was used. And adjusted to a bacterial concentration of 3 to 5 ⁇ 10 9 cells / ml, and used for inoculation.
  • the tissue was immersed in the above-described agrobacterium suspension for 3 to 10 minutes.
  • a modified LS solid medium containing 100 acetosyringone, 20 g / 1 sucrose and 10 g / 1 glucose (inorganic salts of Linsmaier and Skoog, histamine of Murashige and Skoog; Murashige, T. and Skoog, F. 1962) Physiol. Plant. 15: 473-497, 0.1 mg / l strength rice, 1.0 mg / l casamino acid, 2.3 g / 1 gellite), and cultured under illumination at 25 ° C for 2-3 days. Thereafter, the cells were washed with sterilized water containing 250 mg / l cefotaxime, and cultured in an L S solid medium containing the same concentration of cefotaxime.
  • the callus was immersed in the aforementioned agropacterium suspension for about 5 minutes, and then transplanted to the 2N6 solid medium containing acetociringone shown in Example 1 and co-existed at 25 ° C in the dark for 3 days. Culture was performed. Thereafter, the calli were washed with sterilized water containing 250 mg / l cefotaxime, and cultured on LSD 1.5 solid medium containing the same concentration of cefotaxime and 30 mg hahygromycin to select for transformed calli.
  • the GUS activity was examined based on the method of Example 1 for the shoot apex tissue and callus immediately after the co-culture treatment, and thereafter, for the shoot apex tissue and callus that was continuously cultured.
  • the area near the growth point is a very fine tissue, and it is not easy to puncture it and infect it with an agrobacterium. From the results of this experiment, it was considered that skilled techniques such as excision of the growth point and puncture were necessary for transformation of the growth point to the vicinity of the growth point with Agrobacterium.
  • the cells were cultured on a solid medium containing hygromycin to grow compact and bumpy Calsca S in part of the test callus.
  • the proliferated cells showed GUS gene expression and are considered to be transformed cells.
  • These compact, bumpy transformed calli were prepared by the method of Lupotto et al. (Lupotto, E. and Lusardi, MC 1988; Maydica XXXI 11: 163-17). 7) can be redifferentiated.

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Description

明細書
単子葉植物の形質転換方法
技術分野
本発明は、 単子葉植物の形質転換方法に関する。
ϋ體
単子葉植物の形質転換方法としては、 従来より、 エレクト口ポレーシヨン法、 ポリエチレングリコール法 (PEG法) 、 パーティクルガン法その他が知られて いる。
エレクト口ポレーシヨン法は、 プロトプラストと目的の DNAを混合し、 電気 刺激で細胞膜に穴を開けることにより DNAを細胞内に導入し、 形質転換を図る 方法である。 現在、 最も再現性のある手法で、 この方法で種々の遺伝子が単子葉 植物、 特にイネに導入されている (Toriyama R. et al., 1988; Bio/Technol. 6 :1072-1074, Shimamoto R. et al., 1989; Nature 338:274-276, Rhodes C. A. et al., 1989; Science 240:204-207)。 しかしながら、 この方法は、 1 ) プロト プラストからの個体再生系が確立されている植物種にのみ適用可能である、 2) プロトプラストから個体再生までには数か月を要するので、 形質転換体を得るの に時間がかかる、 3) 培養期間が長期化するので、 それに伴う培養変異の頻度が 高くなり、 正常な形質転換体を得る確率が低くなる、 という問題点を有する。
PEG法は、 目的遺伝子とプロトプラストとを混合し、 PEGで処理すること によって遺伝子の導入を図る方法であり、 エレクトロポレーシヨン法とは電気刺 激が PEGに変わった点で異なる。 導入効率はエレクト口ポレーシヨン法よりは いくぶん低いと考えられる。 この方法で形質転換体を得た報告はあるものの、 広 く用いられているとは言い難い。 プロトプラストを用いるため、 エレクトロボレ ーシヨン法と同様な問題点を持つ (Zhang W. et al., 1988; Theor. Appl. Gene t. 76:835-840, Datta S.R. et al., 1990; Bio/Technol. 8:736-740) 。
パーティクルガン法は、 目的の遺伝子を微細な金属粒子に付着させ、 金属粒子 を高速で細胞あるいは組織に打ち込むことによって形質転換を行わせる方法であ る。 従って、 原理的にはあらゆる組織を対象に形質転換を行うことができ、 特に 、 プロトプラストからの再生系が確立されていない植物種に有効である。 形質転 換効率は、 遺伝子を打ち込んだ後の選抜に依存する。 エレクトロボレ一シヨン法 と効率を比較したデータはない(Gordon-Ka關 W. J. et al., 1990; Plant Cell 2:603 - 618, Fromrn M. E. et al., 1990; Bio/Technol. 8:833-839, Christou P. et al., 1991; Bio/Technol. 9:957-962) 。
その他の方法としては、 1) 種子、 胚と DNAの共存培養(Topfer R. et al.,
1989; Plant Cell 1:133-139, Ledoux L. et al., 1974 Nature 249:17-21) 、 2 ) 花粉管への処理 (Luo and Wu 1988; Plant Mol. Biol. Rep. 6:165-)、 3) リボソーム法 (Caboche M. 1990; Physiol. Plant. 79:173-176, Gad A. E. et al., 1990: 177-183)及び 4) マイクロインジェクション法 (Neuhaus G. et al.,
1987; Theor. Appl. Genet. 75:30-36)があるが、 形質転換の効率、 再現性、 あ るいは汎用性に関して問題があり、 一般的な方法とは言い難い。
一方、 ァグロパクテリゥム属細菌の T iプラスミドをベクターとして用いた遺 伝子導入法は、 タバコ、 ペチュニア、 ナタネ等の双子葉作物の形質転換法として 普遍的に用いられている。 しかしながら、 ァグロパクテリゥム属細菌の宿主は双 子葉植物のみに限られ、 単子葉植物には寄生しないとされている (De Cleene M.
1976; Bot. Rev. 42: 389-466) 0
ァグロパクテリゥムによる単子葉植物の形質転換に関してはアスパラガス (By tebier B. et al., 1987: Proc. Natl. Acad. Sci. USA :84 :5345-5349)、 そして ャム (Dioscorea bulbifera) (Schaferw, et al. , 1987; Nature 327:529- 532)で 報告されているが、 その他の単子葉植物、 特にイネ科作物にはこの方法を適用で きないとされている (Potrykus I. 1990; Bio/Technol. 8:535-543) 。
Grimsley et al, 1987: Nature 325:177-179はァグロパクテリゥムの T一 DN Aの中にトウモロコシス卜リークウィルス (Maize streak virus) の DNAを揷 入したものをトウモロコシの生長点に接種したところ、 トウモロコシストリーク ウィルスの感染を確認したことを報告している。 トウモロコシストリークウィル スの D N Aを接種しただけではこのような感染症状が認められないことから、 上 の観察結果はァグロパクテリゥムがトウモロコシに D N Aを導入することができ ることを示すものと解釈している。 しかし、 ウィルスは核ゲノムに組み込まれな くても増殖する可能性があるので、 この結果は T一 D N A力核に組み込まれたこ とを示すものではない。 その後、 感染効率はトウモロコシの茎頂の生長点に接種 した時が最も髙く (Grimsley et al . , 1988; Bio/Technol . 6 : 185-189)、 感染に はァグロパクテリゥムのプラスミドの virC遺伝子が必須であることを示した (Gr imsley et al . , Mol . Gen. Genet. 217:309-316)。
Gould J. et al . ( 1991 ; Plant Physio l . 95:426-434) はトウモロコシの茎頂 に針で傷をつけた後カナマイシン抵抗性遺伝子と G U S遺伝子を持った強病原性 ァグロパクテリゥム E H A 1を接種し、 処理後の茎頂組織をカナマイシンで選抜 したところ、 抵抗性を示す植物体を得た。 この後代の種子の一部は導入した遺伝 子を持つことをサザン分析で確認した (キメラ現象) 。
Mooney P. A. et al . , (1991 ; Plant Cel l, Tissue, Organ Culture 25:209-21 8)は、 ァグロパクテリゥムを用いて小麦の胚にカナマイシン抵抗性遺伝子の導入 を試みた。 まず、 胚を酵素で処理し、 細胞壁に傷をつける処理をし、 その後ァグ 口パクテリゥムを接種した。 処理したカルスのうち極めて少数のカナマイシン抵 抗性と思われるカルス力 S増殖したが、 このカルスからの植物体の再生はできなか つた。 また、 カナマイシン抵抗性遺伝子の存在をサザン分析で確認したところ、 全ての抵抗性力ルスで導入遺伝子の構造変異が見られた。
Raineri et al. (1990; Bio/Technol . 8:33-38) はイネの胚盤に傷をつけた後 、 強病原性のァグロパクテリゥム A 2 8 1 (pTiBo542) をイネの 8品種に処理し たところ、 日本晴、 藤坂 5号の 2品種で腫瘍状の組織の増殖が見られた。 さらに 、 T一 D NAからホルモン合成遺伝子を除いた T iプラスミドにカナマイシン抵 抗性遣伝子と G U S遺伝子を挿入したプラスミドを持つァグロパクテリゥムをィ ネの胚に接種したところカナマイシン抵抗性カルスの増殖が見られた。 この抵抗 性カルスでは G U S遺伝子の発現が認められたが、 形質転換植物を得ることはで きなかった。 これらのことから、 ァグロパクテリゥムの T一 D NAがイネ細胞に 導入されたと解釈している。
このように、 イネ、 トウモロコシ、 コムギ等のイネ科の作物でもァグロバクテ リウムによる遺伝子導入が可能であることを示唆する研究報告が現れてきている 力 まだ、 再現性、 導入効率、 さらには遺伝子の導入の確認についても完全に説 得できる結果を示しているとは言い難い (Potrykus I . 1990 ; B io/Techno 1 . 8: 5 35-543) 。
上述のように、 イネ科作物における遺伝子導入法は、 エレクト口ポレーシヨン 法が主流であるが、 プロトプラストを用いるため、 再生植物を得るまで長期間を 要し、 多大な労力がかかり、 また長期間の培養により高頻度で変異体が出現する という危険性がある。 また、 この方法はプロトプラストからの再分化系が確立さ れていない作物、 例えばトウモロコシには適用できない。 そこで、 上述のように 、 トウモロコシに対しては、 生長点組織を用いることが試みられている (Gould J. et al . , 1991)。 しかし、 生長点を単離する作業は多くの労力を要し、 大量に 調製することは必ずしも容易ではない。
発明の開示
従って、 本発明の目的は、 従来の方法に比較して、 形質転換から植物体の再生 までの時間が短く、 プロトプラストからの植物体の再生系が確立されていない植 物に対しても普遍的に適用することができ、 さらに用いる材料の調製力 s容易な単 子葉植物の形質転換方法を提供することである。
本願発明者らは、 ァグロパクテリゥムで処理する単子葉の植物組織、 ァグロバ クテリウムの処理条件、 及びバイナリーベクタ一の構成等が遺伝子導入効率に及 ぼす影響等を鋭意研究した結果、 単子葉植物の培養組織をァグロパクテリゥム属 細菌を用いて飛躍的に高い効率で再現性をもって形質転換することができること を見出し、 これによれば上記目的を達成することができることを見出し、 本発明 を完成した。
ずなわち、 本発明は、 所望の遺伝子を含有するァグロパクテリゥム属細菌で単 子葉植物の脱分化過程にある培養組織又は脱分化した培養組織を形質転換するこ とから成る、 単子葉植物の形質転換方法を提供する。
本発明の方法により、 イネ、 トウモロコシ、 コムギ、 ォォムギ等のイネ科植物 を始めとする単子葉植物に目的の外来遺伝子を再現性良く導入すること力 s初めて 可能になった。 ァグロパクテリゥムを用いた単子葉植物の形質転換方法はこれま でにもある力 前述のとおり確立された方法とは言い難い。 しかし、 本発明では これまでに用いられていない培養組織に本発明で改良した方法でァグロパクテリ ゥムを接種することにより、 極めて容易に遺伝子を導入することができた。 本発 明の方法では、 材料調製が容易なカルス等の培養組織を用いるので、 生長点を用 いる従来技術に比べて供試材料を容易に得ることができる。 また、 培養組織を形 質転換するので、 プロトプラストを形質転換する場合に比べて植物体再生までの 時間が短く、 変異の頻度が低下する。 また、 スーパ一バイナリーベクターを用い れば、 一部のィネの品種のように培養が困難な品種にも高い効率で遺伝子を導入 することが可能になった。 さらに、 後述の実施例に記載するように、 適切な接種 後の選抜法を採用すれば、 目的遺伝子がキメラ状に導入されるキメラ現象を低減 させることもできる。
図面の簡単な説明
図 1は、 本発明の方法に用いることができるァグロパクテリゥム属細菌に含ま れるプラスミドの一例である PT0K162 の構造と本発明の実施例で用いたプラスミ ド P T O K 2 3 2の構築方法を示す図である。
発明を実施するための最良の形態
本発明の方法により形質転換される単子葉植物は、 特に限定されるものではな く、 イネ、 トウモロコシ、 ォォムギ、 コムギ、 アスパラガスその他、 いかなる単 子葉植物にも適用可能である。
また、 本発明の方法に供される培養組織は、 単子葉植物の脱分化過程にある培 養組織又は脱分化した培養組織である。 ここで、 脱分化過程にある培養組織とは 、 外植片をオーキシン及びサイトカイニン等の植物生長調節物質を含む培地で培 養することにより得られる組織で、 カルス及び不定胚様組織が形成される前段階 の組織を意味し、 脱分化した培養組織とは外植片をオーキシン及びサイトカイ二 ン等の植物生長調節物質を含む培地で培養することにより得られるカルス及び不 定胚様組織を意味する。 本発明で用いられる培養組織はいかなる部位由来のもの であってもよく、 例えば、 胚盤、 茎頂、 幼根、 未熟胚、 花粉及び蔚由来のものを 挙げることができる。 本発明で用いられる培養組織としては、 脱分化誘導培地に 外植片を置床した後 7日以上経過したカルス形成過程にある培養組織、 又はカル ス及び不定胚様組織を用いることが好ましい。 中でも、 カルス及び不定胚様組織 を培養組織として用いることが最も好ましい。 脱分化誘導培地はこの分野におい て周知であり、 例えば N 6培地 (Chu C.C. 1987; Proc. Symp. Plant Tissue Cu lture, Science Press Peking, PP.43- 50)の主要無機塩類及びビタミン類に 2 m g/ 1 2, 4一 D、 l gZlカザミノ酸、 30 g/lショ糖、 2gZlゲルラ ィ トを添加した培地及び L S培地 (Linsmaier, E. , and Skoog, F. 1965; Physi ol. Plant 18:100-127) の無機塩及びビタミン類に 100 m g/ 1カザミノ酸、 70 OmgZ 1プロリン、 1. 5mg/l 2, 4— D、 208ノ1ショ糖、 2 . 3 gZ 1ゲルライトを添加した培地等を用いることができる。 もっとも、 本発 明の方法に用いる培養組織は必ずしもカルスである必要はなく、 懸濁細胞であつ てもよい。
形質転換に用いられるァグロパクテリウム属細菌は、 従来より双子葉植物の形 質転換に用いられているものを用いることができる。 これらのものの多くは Agro bacterium tumefaciens 由来の T iフラスミ ドのヴィルレンス領域 (vir領域) 由来の DN A領域を含むベクターを有しており、 植物に付与しょうとする形質を 担う遺伝子はこのベクター中に挿入されるか又はこのベクターとは別のプラスミ ド中に存在し、 相同組換え等により T iプラスミ ド中に vivoで揷入されるも のである。 また、 本願発明者らは、 先に、 Agrobacterium tumefaciens A281とい う強病原性の、 形質転換効率が極めて髙ぃ株 (Hood E.E. et al., 1984; Bio/Te chnol. 2:702-709, Hood E.E. et al., 1986; J. Bacterid . 168:1283-1290, R omari T. et al., 1986; J. Bacterid . 166:88-94, Jin S. et al., 1987; J. Bacteriol. 169:4417-4425, Romari T. 1989; Plant Science 60:223-229 ATCC3 7394) に含まれる T iプラスミド pT i B o 542 (Jin S. et al., 1987: J. Bacteriol. 169:4417-4425) のヴィルレンス領域 (vir領域) 由来の DNA領域 を含むベクター (本明細書において、 このベクターを Γスーパーバイナリーべク ター J と呼ぶことがある) を開発した (特開平 4— 222527号) 。 このよう なスーパーバイナリーベクターを本発明において好ましく用いることができる。 このようなスーパ一バイナリーベクターの例として PT0K162 (特開平 4一 22 2527号、 欧州特許公開第 504869号、 米国特許出願第 07 854, 8 44号) を挙げることができる。 その構造を図 1に示す。 このプラスミドは、 大 腸菌及び Agrobacterium tumefaciens 中で増殖可能である pT0K154 と呼ばれるプ ラスミド (T iプラスミドから誘導された公知の PGA472プラスミドと pVCKlOl と 呼ばれる公知の広宿主域プラスミドから後述の方法により構築された、 T領域を 含むプラスミド) に pTiBo542のヴィルレンス領域由来の既にクローン化されてい た上記 15. 2キロベースの Kpnl断片 (virB、 virG、 virG各遺伝子を含む) を組 み込んだものである。 この PT0K154 には、 T領域の 2つの境界配列とその間に単 子葉植物に導入しょうとする遺伝子としてカナマイシン耐性遺伝子が配列されて おり、 この例は、 単子葉植物に導入しょうとする遺伝子力 SpTiBo542のヴィルレン ス領域由来のクローン化された DN A断片を含有するプラスミ ド上に配置されて いる例である。 なお、 図 1中の各符号は次の意味を有する。
S P スぺクチノマイシン抵抗性遺伝子
HPT ハイグロマイシン抵抗性遺伝子
NPT カナマイシン抵抗性遺伝子
TC テトラサイクリン抵抗性遺伝子
I G イントロン GUS遺伝子
BR T— DNAの右ボーダー配列
BL T— DNAの左ボ一ダ一配列
V i r B, C, G 強病原性ァグロパクテリゥム A 281由来の v i r領域 OR I Co l E lの複製開始点
COS ラムダファージの COS部位
K 制限酵素 Kpn l部位
H 制限酵素 H i n dill 部位
単子葉植物に組み込もうとする所望の遺伝子は、 上記プラスミドの T領域中の 制限酵素部位に常法により組み込むことができ、 プラスミドが有する薬剤耐性等 の適当な選択マーカ一に基づいて選択することができる。 もっとも、 図 1に示す PT0R162 のように、 大型で多数の制限部位を持つものは、 通常のサブクローニン グの手法では所望の D N Aを T領域内に導入することが必ずしも容易ではないこ とがある。 このような場合には、 Agrobacterium tumefaciens細胞内の vivo 系での相同組換え (Herrera- Estrella L. et al., 1983; EMBO J. 2:987-995, H orsch R. H. et al . , 1984; Science 223:496-498) を利用することにより、 目的 の D N Aを PT0K162 に導入することが可能になる。 すなわち、 例えば、 先ず、 pT 0K162 を Agrobacterium tumefaciens に導入しておいて、 この菌にさらに所望 D N Aを導入した PBR322と呼ばれるプラスミ ド (類似のプラスミドを含む) を導入 する。 PT0K162 の D N Aには PBR322と相同な部分があるので、 pBR322誘導体は相 同配列を介した組み換えにより PT0K162 に組み込まれることになる。 pBR322は pT 0K162 と異なり Agrobacterium tumefaciens 中では複製できないので、 このよう な組み込まれた状態 (pT0K162: :pBR322誘導体という) でなければ Agrobacteriu m tumefaciens 中で生存することができない。 そして、 pT0K162 と pBR322誘導体 のそれぞれに特異的な特性 (薬剤耐性等) について選抜すれば、 pT0K162: : pBR32 2 謖導体を有する Agrobacterium tumefaciens を得ることができる。 さらに、 pT 0R162 を有する Agrobacterium tumefaciens に各種のプラスミドを導入して研究 したところ、 PBR322誘導体の選抜マーカ一としては、 トランスポゾン T n 7 (De Greve H. H. et al . , 1981 ; Plasmid 6 :235-248)由来のスぺクチノマイシン耐性 遺伝子 (S P ) が優れていることが判明した。 従って、 すでに所望の遺伝子が pB R322にクローン化されている場合には、 S P遺伝子をそのプラスミドに揷入すれ ば、 Agrobacterium tumefaciens 内の相同組換えにより、 pT0K162 の Τ領域に所 望の遺伝子を導入することができる。 またその他の場合には、 PBR322由籴の D N Αと S P遺伝子から構成されるプラスミドを用意しておいて、 これに所望の遺伝 子を挿入する方法も考えられる。 この際、 T領域の境界配列を活用すれば、 最終 的に、 PT0K162 上において、 カナマイシン耐性遺伝子と所望の遺伝子を別々の T 領域中に配置することも可能である。 カナマイシン耐性をマーカーとして植物を 形質転換した場合、 両 T領域とも導入される場合も相当の比率で生じるわけであ るので、 目的遺伝子の導入は十分達成できる。 また、 両 T領域が別々の染色体に 組み込まれる場合もあり得るので、 後に目的の遺伝子をカナマイシン耐性遺伝子 から分離することも可能となる。
単子葉植物に導入しょうとする所望の遺伝子は、 何ら限定されるものではなく 、 望まれる性質を付与することができるあらゆる遺伝子が包含される。 例えば、 除草剤抵抗性遺伝子、 抗生物質抵抗性遺伝子、 ウィルス病抵抗性を付与するため のウィルスのコート蛋白質遺伝子及び胚乳の澱粉形質閧連遺伝子などを挙げるこ とができる力 もちろんこれらに限定されるものではない。
寄主となるァグロパクテリゥム属細菌としては、 特に限定されないが、 Agroba cterium tumefaciens を好ましく用いることができる。
プラスミドを Agrobacterium tumefaciens 等のァグロパクテリゥム属細菌に導 入する操作は従来法により行うことができ、 例えば、 細菌の三系交雑手法 (DiU a G. et al ., 1980; Pro Natl . Acad. Sci. USA 77: 7347-7351) により行うこ とができる。
このようにして調製されるァグロパクテリゥム属細菌には、 PT0K162 由来のヴ ィルレンス能力の高い D N Aが含まれるので、 高い効率で単子葉植物の形質転換 を行うことが可能である。
尚、 本発明においては、 単子葉植物に導入しょうとする遺伝子は、 従来の技術 と同様に T領域の境界配列の間に配置されるものである力 ァグロパクテリゥム 属細菌中で、 T iプラスミド上に配置されてもよく又は他のプラスミド上に配置 されてもよい。
ァグロパクテリウム属細菌で単子葉植物の培養組織を形質転換する方法は、 培 養組織をァグロパクテリゥム属細菌と単に接触させることによリ行うことができ る。 例えば、 1 06 〜1 O il細胞 Zm 1程度の細胞濃度のァグロパクテリゥム属 細菌懸濁液を調製し、 この懸濁液中に培養組織を 3〜1 0分間程度浸漬後、 固体 培地上で数日間共存培養することにより行うことができる。 あるいは、 培養組織 の培養液中にァグロパクテリゥム属細菌を添加して共存培養することにより形質 転換を行うこともできる。 このように、 本発明の方法では、 培養組織を酵素処理 や傷つける等の前処理を行わずに形質転換に供することができる。
形質転換に供試した培養組織は、 その後、 脱分化過程又は脱分化状態で形質転 換細胞又は形質転換組織を選抜することが好ましい。 これは当該培養組織をォー キシン、 サイトカイニン等の植物生長調節物質を含み、 ハイグロマイシン等の選 抜マーカー及びァグロパクテリゥム属細菌に対する抗生物質を添加した培地で培 養することによリ行うことができる。
選抜した細胞又は組織は公知の方法によリ再分化培養を行うことができる。 こ れにより、 形質転換により所望の形質を獲得した植物体を再生することができる 以下、 本発明を実施例に基づきより具体的に説明する。 もっとも、 本発明は下 記実施例に限定されるものではない。
実施例 1
(1) 供試培養組織の調製
(0 イネの品種
日本稲品種、 朝の光、 月の光及びコシヒカリを選定して供試した。
(ii)胚盤、 胚盤カルス
イネの完熟種子を 70%エタノールに 1分間、 1 %次亜塩素酸ナトリウムに 3 0分間浸漬することによって消毒した後、 2N6固体培地 (N6の無機塩類及び ビタミン類(Chu C.C. 1978; Proc. Symp. Plant Tissue Culture, Science Pres s Peking, PP.43- 50) 、 l g/1カザミノ酸、 2mg/ 2,4-D、 30 g/lシ ョ糖、 2 g/lゲルライト) に置床した。 また、 完熟種子を置床後 4日目に種子 より胚盤部位を摘出し胚盤として供試した。 完熟種子を約 3週間培養後、 形成さ れた胚盤由来のカルスを 2 N 6培地に移植し、 4~ 7日経過したカルスを胚盤カ ルスとして用いた。
(ϋί) 茎頂組織
ィネの完熟種子を上記の方法で消毒した後、 1 2 N 6固体培地 ( 1 2量の N 6の主要無機塩類及び微量塩類、 N 6ビタミン類、 l gZlカザミノ酸、 20 gZlショ糖、 2 gZlゲルライト) に置床し、 培養 3日後の幼苗から、 頂端分 裂組織を含む 2~3 mmの組織を切り出し、 材料とした。
(iv)幼根組織、 幼根カルス
(iii) の方法で得た幼植物体から種子根の先端部を 5〜10mm切り出して材 料とした。 また、 これらの幼根を 2 N 6固体培地上で約 2週間培養して得たカル スを—幼根カルスとして用いた。
(V) 懸濁培養細胞
(ii)の方法で得た胚盤由来のカルスを AA液体培地 (AA主要無機塩類、 AAアミ ノ酸及び AAビタミン類(Toriyama and Hinata 1985; Plant Science 41:179-183, MS微量塩類 (Murashige and Skoog 1962; Physiol. Plant. 15:473-497) 、 0. 5 g/1 カザミノ酸、 l mg/ 1 2,4- D、 0.2 mg/1力イネチン、 0.1 mg/1ジべレ リン、 20 gZlショ糖) に移し、 25°C、 暗黒下で 1 20 r pmで振盪するこ とによって懸濁培養細胞を得た。 なお、 培地の更新は 1週間毎に行った。 (2) T iプラスミド (バイナリ一ベクタ一)
ハイグロマイシン抵抗性遺伝子 (HPT) 及び /5— D—グルクロニダーゼ (G US) 遺伝子を T iプラスミ ドの T一 DN A領域に組み込んだ、 以下のプラスミ ドを作製した。
(i) pIG121 Hm:ヒマのカタラーゼ遺伝子の第 1イントロンを含む GUS遺伝子と 、 ハイグロマイシン抵抗性遺伝子と連結したプラスミド (中村ら、 199 1 ;植 物バイオテクノロジ一 II (現代化学増刊、 PP.123-132) 、 名古屋大学、 中村氏よ り入手) 。
(ii) pTOK232 :
1. イントロン GUS及びハイグロマイシン抵抗性遺伝子の中間べクタ一 p T〇 Κ 229への導入
Τη 7由来のスぺクチノマイシン抵抗性遺伝子を含む C 1 a I断片 (2. 5 k b) をクレノー処理により末端を平滑化し、 これを pUC 19の Sma I部位に 挿入し、 アンピシリン及びスぺクチノマイシン抵抗性遺伝子を持つプラスミド P TOK1 07 (5. 2 k b) を得た。 p T 0 K 1 07を E c o R I、 H i n dll I で処理し、 スぺクチノマイシン抵抗性遺伝子を含む 2. 5 1)断片を 0 4 82の E c oR I、 H i ndlll 断片 (2. 7 k b) と連結し、 スぺクチノマイ シン抵抗性遺伝子と H i n d III 、 H p a I部位を含む p TOK 170 (5. 2 k b) を得た。
35 Sプロモーターにヒマのカタラーゼの第 1イントロンと GUS遺伝子を連 結したベクター P I G 221 (Ohta S. et ah, 1990; Plant Cell Physiol. 31 :805-813, 名古屋大学中村氏より譲渡) を Ec o R Iで切断後クレノー酵素によ り末端を平滑化し H i n dill リンカ一 (pCAAGCTTG; タカラ酒造コ一 ド 4660 P) を揷入した。 35 Sプロモータ一及びイントロン GUSを含む断 片を H i n dill により切り出し、 35 Sプロモータ一にハイグロマイシン抵抗 性遺伝子を連結したプラスミ ド pGL 2 (J. Paszkowski, Friedrich Mieocher Institute より入手) の H i ndlll 部位に挿入し pGL2— I G (7. 6 k b ) を得た。 なお、 pGL2は pDH51 (Pietrazak et al., 1986; Nucleic Ac ids Research 14:5857-5868)にハイグロマイシン抵抗性遺伝子(Gritz L. and Da vis J. 1983; Gene 25:179-188) を揷入したものである。 p TOK 1 7 0を H p a I処理して得られた断片を pGL 2— I Gの P v ull断片 (5. 2 k b) と連 結し P TOK2 29 ( 1 0. 1 k b) を得た。
2 ) スーパ一バイナリーベクター p T OK 1 6 2への導入
バイナリーベクターに強病原性ァグロバクテリゥム A 2 8 1由来の V i r B、 v i r C、 ν i r G遺伝子を挿入して得たスーパーバイナリーベクター p TOK 1 6 2への目的遺伝子 (ハイグロマイシン抵抗性遺伝子、 イントロン GU S遺伝 子) の導入は相同組換えによって行った。 すなわち、 両ベクターは大腸菌プラス ミ ド p B R 3 2 2に由来する部位を持つので、 スぺクチノマイシン、 カナマイシ ンで選抜された菌には両プラスミドの組換えによって生じたプラスミドのみが含 まれることになる。 スーパ一バイナリーベクタ一にハイグロマイシン抵抗性遺伝 子、 イントロン GU S遺伝子力 S組み込まれたプラスミドを ρ ΤΟΚ23 2と呼ぶ (図 1参照) 。
(3) 寄主ァグロパクテリゥム
T-DNA 領域を削除した菌系、 LBA4 04と EHA101とを寄主バクテリアとして使用 した。 LBA4 04はへルパープラスミド ( vir領域を完全な形で持つ) PAL4404を 有する菌系であり、 American Type Culture Colletion より入手可能である (A TCC 3 7 349) 。 EHA101はへルパープラスミドの vir領域が強病原性ァグ 口パクテリゥム A281由来であり、 Hood E. E. et al. 1986から入手可能である。
(2) 項で述べた種々のバイナリーベクターをこれら 2種類のァグロパクテリゥ ムに導入し、 以下の菌系を遣伝子導入用として用いた。 これらのプラスミドをァ グロパクテリゥムに導入する方法は細菌の三系交雑手法 (Ditta G. et al. 1980 ; Proc. Natl. Acad. Sci. USA 77:7347-7351)によった。
LBA4404(pT0K232)
LBA4404(pIG121Hm)
EHA101 (pIG121Hm)
(4) ァグロパクテリゥム懸濁液の調製
ハイグロマイシン(50 ^g/ml) とカナマイシン(50 μg/ \) を含む AB培地( Dr lica R. A. and Kado C. I. 1974; Proc. Natl Acad. Sci. USA 71:3677-3681) 上で 3〜 10日間培養したァグロパクテリゥムのコロニーを白金耳でかきとり、 修 正 AA培地 (前述の AA培地において、 ショ糖を 0.2M、 グルコースを 0.2Mに変更し、 ァセ卜シリンゴンを 100 M 添加、 pH5.2)に懸濁し、 菌濃度を 3~5 X109 細胞 ノ m 1に調整し接種に用いた。
(5) 接種条件
供試組織を滅菌水で洗浄後、 上述のァグロパクテリウムの懸濁液に 3〜 10分間 浸漬した。 浸漬処理後、 茎頂組織は 100 M ァセトシリンゴン、 lOg/1 グルコ一 ス、 20g /1ショ糖を含む N6S3固体培地(1/2 N6主要無機塩類、 N6微量塩類、 N6 ビタミン類、 Chu C.C.1978、 AAアミノ酸(Toriyama and Hinata 1985), 1 g/ 1 カザミノ酸、 0.2 mg NAA、 1.0 mg/1力イネチン、 3 gZlゲルライト) に、 胚 盤カルスなどのその他の培養組織はァセトシリンゴン、 グルコース、 ショ糖を同 濃度で含む 2N6固体培地に移植し、 25°C、 暗黒下で 2〜5日間培養した。 その後 、 接種組織を 250 mg/1 セフォタキシムを含む滅菌水で洗浄し、 同濃度のセフォ タキシムを含むそれぞれの固体培地で培養を続けた。
(6) GUS活性の調査方法
共存培養処理直後、 組織を 0.1 Triton X-100 を含む 0.1 Mリン酸緩衝液 (p H6.8)に浸漬し、 37 °Cで 1時間静置した。 リン酸緩衝液でァグロパクテリゥム を洗浄除去した後、 0.1 mM 5—プロモー 4一クロロー 3—インドリル一 y5— D—グルコン酸 (X - glue) 及び 20%メタノールを含むリン酸緩衝液を添加した 。 37°Cで 24時間処理した後、 青色の呈色を示す組織を顕微鏡下で観察し、 供 試組織数に対する百分率で表した。 なお、 選抜処理後得られた形質転換体と考え られる植物体での GUS活性の判定に際しては、 植物体から葉片を採取し、 同様 な方法に従って GUS染色を行った。 個体ごとの発現様式で、 葉片全体又は葉片 の切り口が一様に青色に呈色するものを陽性個体、 キメラ状に呈色するものをキ メラ個体とした。
(7) 形質転換細胞、 組織の選抜
(i) 茎頂組織
5日間ァグロパクテリゥムと共存培養した茎頂組織を 250 mg/1セフオタキシム を含む N 6 S 3培地で 2週間培養し、 生長した茎頂組織を 4 OmgZ 1ハイグロ マイシンを含む N 6 S 3培地に移して、 形質転換体の選抜を行った。
(ϋ) 胚盤
3曰間共存培養した胚盤を 25 OmgZlセフォタキシムを含む 2N6培地で 1 週間培養した後、 5 OmgZ 1ハイグロマイシンを含む 2 N 6培地で形質転換細 胞の選抜を行った。
(iii) 培養組織 (胚盤カルス)
3日間共存培養した培養組織を、 25 OmgZ 1セフォタキシムを含む 2N6 培地で 1週間培養した後、 同培養組織を 5 OmgZlハイグロマイシンを含む 2 N 6培地で 3週間培養してハイグロマイシン抵抗性の培養組織を選抜した ( 1次 選抜) 。 得られた抵抗性組織をさらに 5 Omg/ 1ハイグロマイシンを含む N 6 一 12培地 (N 6無機塩類、 N 6ビタミン類、 2 gZlカザミノ酸、 0.2 mg/1 2 ,4-D、 0.5 mg/1 6 BA、 5 mg/ 1 ABA、 30 gZlソルビトール、 20 g/1ショ糖、 2 gZ 1ゲルライト) で 2~3週間培養し (2次選抜) 、 この培 地上で増殖したカルスを 0、 20、 5 Om 1ハイグロマイシンを含む個体再 生用培地 N6 S 3に移した。 なお、 共存培養後の培地には全て 25 OmgZ 1セ フォタキシムを添加した。
(iv) 懸濁培養細胞 一
5日間共存培養した懸濁培養細胞を 25 Omg/ 1セフォタキシムを含む 2 N6 培地で 1週間培養した後、 5 OmgZlハイグロマイシンを含む 2 N 6培地で形 質転換細胞の選抜を行った。
(8) 形質転換次世代における導入遺伝子の発現
形質転換次世代の種子を 7 Omg/Ιハイグロマイシンを含む 400倍ホーマイ水和 剤水溶液中に播種後、 25°Cで 10日間処理し、 ハイグロマイシン抵抗性を調査 した。 また、 形質転換次世代の種子を各 20粒づっ播種し、 約 3週間後の苗から 葉片を採取し、 GUS遺伝子の発現を調査した。
(9) サザン法による導入遺伝子の分析
品種、 朝の光、 月の光の形質転換体当代について、 小鞠らの方法 (Komari et al ·, 1989; Theoretical and Applied Genetics 77:547-552) に従い DNAを抽出 し、 抽出した DNAに制限酵素 Hindmを処理し、 H P T遣伝子をプローブとし、 サザン法による導入遺伝子の検出を行った。 バイナリ一プラスミド上の HPT遺 伝子を含む Hindm断片の長さは、 約 5.5 Kbであり、 この領域の T一 DNAの内 部の Hindmサイ トから Lボーダー配列の末端までの DN A領域の長さは、 約 5.4 Kbである (図 1) 。 なお、 サザン法については Molecular Cloning (Sambrook et al. 1989; Cold Spring Harbor Laboratory Press ) に記載の方法に従って 行った。 また、 " 月の光" の形質転換次世代の 2系統について、 GUS陽性、 G U S陰性、 ハイグロマイシン抵抗性の各個体を 2個体づっ供試し、 同様な手法に よリサザン分析を行った。
( 10)イネでの供試材料の違いによる遺伝子導入効率 (共存培養後における G U S 発現)
ァグロパクテリゥムが単子葉作物の細胞に遺伝子を導入することが可能である ことを確認するため、 強病原性の V i r領域を持つァグロパクテリゥム EHA 1 0 1にハイグロマイシン抵抗性遺伝子と GUS遺伝子を持つバイナリーベクター pIG121Hm (上述) を導入した菌をイネ品種月の光の種々の組織に処理し、 共存培 養後に GUS活性を調査した。 供試組織は茎頂、 幼根、 胚盤、 幼根カルス、 胚盤 カルス及び懸濁培養細胞である。 ァグロパクテリゥムで処理しなかった場合は、 いずれの材料でも青色の GU S発現を示すものは認められなかった。 一方、 ァグ 口パクテリゥム EHA 101 (pIG121Hm) で処理した場合には、 幼根を除く組織 で GUSの発現が確認された。 処理組織数に対する青色を呈する組織の割合では 胚盤カルスが最も高かった (表 1) 。 さらに、 GUSを発現する組織の大きさで も胚盤カルスが優れていた。 胚盤カルスに次いで高い導入率を示した組織は茎頂 であった。 また、 胚盤の脱分化組織である胚盤カルスおよび懸濁培養細胞で高い 導入率を示したのに対し、 胚盤では明らかに導入効率は低かった。 このことは、 よリ細胞分裂の活性が高い組織に遺伝子が導入されやすいことを示唆するもので ある。 表 1 #¾¾#©¾いによる GUS適 導 婢 GSS:月 c¾
Figure imgf000019_0001
+ 1% TF ++ 0% 10% h
この実験で使用したバイナリ一ベクタ一 P I G 1 2 1 H mでは G U S遺伝子の プロモーターの中にヒマのィントロンが揷入されているため、 ァグロバクテリウ ムの細胞の中では G U S遺伝子は発現しないことが確認されている (中村ら、 1 9 9 1 ) 。 以上のことから、 共存培養後の G U S遺伝子の発現を指標とした場合 、 ァグロパクテリゥムはイネ細胞に遺伝子を導入できることが確認された。
( 1 1 ) 供試材料の違いによる形質転換組織および細胞の出現効率
共存培養処理を行った茎頂、 胚盤、 胚盤カルスおよび懸濁培養細胞を用いて、 ハ ィグロマイシンによる形質転換組織および形質転換細胞の選抜を行った。 その結 果、 胚盤カルスおよび懸濁培養細胞でハイグロマイシンに抵抗性を示す形質転換 細胞の増殖が認められた (表 2 ) 。 また選抜された細胞は、 G U S遺伝子を一様 に発現した。 共存培養後、 G U S発現の調査で高い遺伝子導入効率を示した茎頂 組織は、 ハイグロマイシンによる選抜の結果、 全ての組織が枯死し、 抵抗性組織 は得られなかった。 茎頂は生長点を含む組織である力 遺伝子の導入処理を行つ た後、 抵抗性組織が増殖するためには、 遺伝子が限られた生長点に導入される必 要がある。 ァグロパクテリゥムとの共存培養処理後、 茎頂には多数の遺伝子が導 入されているものの抵抗性組織が得られなかったことは、 生長点近傍に導入され る確率が低いことによると考えられる。 また、 生長点近傍に遺伝子が導入され形 質転換細胞が得られたとしても、 得られる植物体がキヌラ性を示す可能性が高い ことは容易に推測される。 これらのことから、 Gould et al. (1991) により報告 されている茎頂を用いた形質転換方法は、 カルスなど脱分化組織を用いる方法に 比べ、 技術的な困難性が高く、 再現性の低い手法であると考えられる。
完熟種子の胚盤に由来する培養組織である胚盤カルスや懸濁培養細胞で形質転 換細胞が得られたのに対し、 胚盤では抵抗性細胞の増殖は認められなかった。 ま た、 Raineri et al. (1990) の方法に従い、 傷をつけた胚盤を供試組織として遺 伝子導入を試みたが、 遺伝子導入効率の向上はみられず、 形質転換細胞も得られ なかった。 これに対し、 胚盤カルスを供試組織とした場合には、 傷をつけるなど の処理も必要なく、 再現性良く、 しかも高頻度で形質転換細胞が得られた。 これ らのことから、 ァグロパクテリゥムによる形質転換の供試組織として、 脱分化状 態または脱分化過程にある培養組織が好適であると判断される。 表 2 供試材料の違いによる形質転換組織および細胞の出現効率
(品種:月の光)
Figure imgf000021_0001
( 12)イネの品種による遺伝子導入効率の違い (共存培養後における G U S発現) 培養細胞の確立、 培養細胞から個体再生に関しては大きな品種間差異が存在す る (Mikami and Rinoshita 1988; Plant Cel l Tissue Organ Cult. 12:311-314) 。 日本稲の中ではコシヒカリは培養が困難とされている。 一方、 前項で用いた月 の光は比較的培養が容易である。 ァグロパクテリゥムによる形質転換法を用いる 場合、 このような品種間差異があると実用的には不都合である。 この点を明らか にするため、 コシヒカリと月の光の培養容易性の異なる 2品種を用いてァグロバ クテリゥムによる遺伝子導入効率の差異を調査した。 供試組織は胚盤カルスとし 、 ァグロパクテリゥムとしては E H A 1 0 1 (pIG121Hm) 及び L B A 4 4 0 4 ( pIG121Hm) を用いた。
月の光では各実験を通じて 9 0 %以上のカルスで G U S活性が認められたが、 コシヒカリではこれより低い率で G U S活性力 S認められた (表 3 ) 。 従って、 E H A 1 0 1 (pIG121Hm) あるいは L B A 4 4 0 4 (pIG121Hm) を用いた場合には 、 導入効率に関する品種間差異があるものと解釈される。 3 ァグロパクテリゥムの! ¾とイネ π口 © t、による GU S遺 5?©¾λ»
Figure imgf000022_0001
LBA4404(pIG121Hm) EHA101(pIG121Hm) LBA4404(p而 32) 月喊 1 67/70 (96) 78/87 (90) 64/66 (97) 月 ¾ 2 72/86 (84) 68/73 (93) 82/82 (100)
3シヒカリ 1 46/135 (34) 43/116 (37) 124/131 (95) コシヒカリ 2 28/107 (26) 81/143 (57) 102/103 (99)
(13)ァグロバクテリウムの菌系による遺伝子導入効率の違い (共存培養後におけ る GUS発現)
EHA101 (pIG121Hm) はへルパープラスミ ドに強病原性ァグロバクテリウ ム A28 1の V i r領域を持つ。 LBA4404 (pIG121Hm) は通常の v i r領 域を持つ。 一方、 LBA4404 (PT0K232)はへルパープラスミ ドの V i r領域 は通常型である力 バイナリ一ベクターに強病原性ァグロパクテリゥム A 281 の v i r領域の一部の遺伝子を有する。 そして、 このバイナリーベクターは pTOK 162から派生したもので、 LBA4404 (ΡΤ0Κ162)は双子葉作物の中でも形質 転換の困難な植物種に極めて高率で形質転換を可能とした (Saito Y. et al., 1 992; Theor. Appl. Genet. 83:679-683). このように、 強病原性の v i r領域の 存在そのもの、 あるいは存在形態は形質転換の効率に大きく影響する可能性があ る。 そこで、 強病原性の V i r遺伝子に関して異なる上記の 3種類のァグロパク テリゥムを用いて、 GUS遺伝子の発現に関する導入効率を比較した。 なお、 供 試材料はコシヒカリ、 月の光の胚盤カルスである。
強病原性の V i r領域を持たない LBA4404 (PIGI21Hm) でも両品種とも G U S活性を示す組織が認められたが、 コシヒカリではその率は 30 %程度と低 かった。 ヘルパープラスミドに強病原性の V i rを持つ E HA 101 (pIG121Hm ) ではコシヒカリの導入率はやや上昇した。 バイナリーベクターに強病原性の V i rを持つ LBA4404 (pT0K232)ではコシヒカリでも月の光と同様に 95 % 以上の組織で GUS活性が認められた (表 3) 。 さらに、 GUS活性を示すそれ ぞれの組織での青色領域の面積に関しては、 LBA4404 (ΡΤ0Κ232)で最も大 きく、 高い導入率を示すことが観察された。
(14)菌系の違いによる選抜効率 (ハイグロマイシン耐性カルス)
上項と同じ 3つの菌系を用いて、 月の光、 コシヒカリの胚盤カルスとの共存培 養後のハイグロマイシン抵抗性カルスの選抜率に関する比較を行った。 抵抗性力 ルスの出現率に関しては LBA4404 (ΡΤ0Κ232)が最も高く、 抵抗性カルスの 選抜率に関する品種間差異は認められなかった (表 4) 。 LBA4404 (pIGl 21Hm) あるいは EHA 101 (pIG121Hm) の 2つの菌系では、 選抜率は低く、 さ らに培養困難なコシヒカリではハイグロマイシン抵抗性カルスの出現は 2 %程度 にとどまった。 従って、 イネの形質転換に用いるァグロパクテリゥムとしてはバ イナリーベクターに強病原性の V i r遣伝子の一部を持つ L B A 4 4 0 4 (pTOK 232)が最も優れていると判定される。
ァグロバクテリウムの縣の違いによる形: 率の違い 讓カルス)
ノ、ィグロマイシン^:性力ルス 力ルス数 (%) 菌 系 難 LBA4404(pIG121Hm) EHA101 (pIG121Hm) LBA4404(pT0K232) 月の光 1 91/338 (27) 139/301 (46) 169/305 (55) 月の光 2 59/421 (14) 66/425 (16) 110/360 (31) 月の光 3 10/521 ( 2) 174,644 ( 27) 月 4 20/349 ( 6) 100/349 (29) コシヒカリ 1 6/269 ( 2) 65/283 (23)
( 15)ハイグロマイシン耐性形質転換体における G U S遺伝子の発現様式 このようにして得られた抵抗性カルスをさらに 2次選抜にかけ、 抵抗性カルス から個体を再生させた。 再分化用の培地 N 6 S 3にハイグロマイシンを添加した 区と無添加の区を設定したが、 無添加の場合には、 G U S活性がない個体あるい はキメラ状に活性を示す個体が多数出現した。 しかし、 再分化培地にハイグロマ ィシンを添加した場合はこのような個体は大幅に減少し、 個体全体で G U S活性 を示す再生個体力 S増加した (表 5、 表 6、 表 7 ) 。 なお、 ァグロパクテリゥムで 処理しなかった場合には、 ハイグロマイシン抵抗性あるいは G U S活性を示す個 体は得られなかった。 従って、 このようなハイグロマイシン抵抗性カルスから再 生した G U S活性を全面に示す個体は形質転換体と考えられる。
表 5 ハイグロマイシン抵抗性カルスから再分化した植物における G U S遺伝子 の発現 (品種:朝の光)
Figure imgf000026_0001
(固体の再分化まで培地にはハイグロマイシンを添加) 表 6 ハイグロマイシン抵抗性カルスから再分化した植物における G U S 遺伝子の発現 (品種:月の光)
Figure imgf000027_0001
(個体の再分化まで培地にハイグロマイシンを添加) 表 7 ハイグロマイシン抵抗性カルスから再分化した植物における G U S 遺伝子の発現 (品種:朝の光)
Figure imgf000027_0002
(個体の再分化まで培地にハイグロマイシンを添加) ( 1 6 ) 形質転換体の倍数性および種子稔性
得られた形質転換体は、 温室内で栽培することにより正常な生長を示し、 外観か ら 4倍体や奇形を示す個体は全く認められなかった。 種子稔性についても、 一部 に部分不稔ゃ完全不稔を示す個体もみられたが、 大部分の個体がほぼ正常な稔性 を示した。
( 1 7 ) 形質転換当代および次世代における導入遺伝子の発現と分析
形質転換体の全 D NAを Hindmで切断した D NA断片に対して、 H P T遺伝子を プローブとしたサザン法により形質転換体当代における導入遺伝子の検出を行つ た。 その結果、 供試した全ての個体で 1〜数コピーの導入遺伝子の存在が認めら れた (表 8, 表 9 ) 。 プラスミド PT0K232 の中では H P T遣伝子を含む HindlH断 片は 5.5 Kb であるのに対し、 供試したすべての形質転換体には、 約 6 Kb 以上 のバンドが認められた。 このことは、 T一 D NAが植物染色体へ組み込まれたこ とを裏付けるものである。 なお、 検出された D N A断片の長さが個体で各々異な つていたことは、 ィネの染色体への遣伝子導入箇所がそれぞれ異なることを示す ものであり、 植物体内でのパクテリァの残存によるものではないことが確認され た。
形質転換次世代個体のハイダロマイシン抵抗性を調査したところ、 対照品種の 種子では、 ほとんど発芽を示さないかもしくは発芽後の生長は著しく阻害された 。 これに対し、 形質転換体から得られた種子の多くは、 正常な発芽と生長を示し た (表 8 , 表 9 ) 。 また、 これら.のハイグロマイシン抵抗性個体は、 G U S遺伝 子の発現も認められた。 多くの系統ではハイグロマイシン抵抗性、 G U S遺伝子 の発現ともに 1因子分離にほぼ適合する逍伝的分離を示した。 表 8における" 朝 の光" の形質転換系統 1一 2および 3— 2は、 分離比から 2因子以上の導入遺伝 子の存在が推測されるが、 サザン解析の結果も 2 因子分離に適合していた。 表 8 の 2— 1の形質転換個体では、 2コピーの導入遣伝子の存在を確認したが、 この うちの一本のバンドは 5 Kb より短い断片であり、 T一 D NAが不完全な形で組 み込まれたものと推測される。 従って、 この個体は次世代でハイグロマイシン抵 抗性について 1因子様の分離を示したものと考えられる。
表 9では" 月の光" の形質転換系統の多く力 次世代でハイグロマイシン抵抗 性および G U S遺伝子の発現について 1因子様の分離を示した。 しかし、 当代の サザン分析では一部の個体が 1コピーであったほかは、 複数のコピー数を示した 。 形質転換当代のサザン分析により、 導入遺伝子が 1 コピーであった 1 8 aおよ び 2コピーであった 1 6 cの次世代 2系統について、 G U S陽性、 G U S陰性、 ハイグロマイシン抵抗性の各個体を 2個体づっ供試し、 サザン分析を行った。 そ の結果、 G U S陰性の個体を除くすべての個体で、 形質転換当代の個体と同一の バンドが検出され、 導入遺伝子が形質転換次世代に遺伝していることが示された 。 2コピーの導入遺伝子を持つ系統 1 6 cについても、 G U S陽性およびハイグ ロマイシン抵抗性の各次世代個体で、 いずれも同一な 2コピーの導入遺伝子を有 していたことは、 同一の染色体または遺伝子座に複数の遺伝子が組み込まれたこ とを示唆するものである。
これらの結果は、 ァグロパクテリゥムによりイネに導入された遺伝子力 植物 細胞の核に組み込まれ、 メンデルの法則に従って、 後代に遺伝したことを示すも のである。
8 サザン解析による形質転換体における導入遺伝子のコピー数および 形質転換次世代における導入遺伝子の発現 (品種:朝の光)
Figure imgf000030_0001
* 2コピーの導入遺伝子のうち 1つは制限断片が短く、 導入遺伝子は不完全
9 サザン解析による形質転換体における導入遗伝子のコピー数および 形質転換次世代における導入遺伝子の発現 (品種:月の光) 次世代個体数 導入遺伝子 ハイグロマイシン抵抗性 G U S発現 形質転換個体 コピー数
抵抗性 感受性 陽性 陰性 対 照 一 0 6 0 0 2 0
1 1 4 6 2 6 1 5 5
2 a 2 3 3 1 8 1 3 5
2 b 2 3 1 9 1 5 5
3 2 2 9 1 0 1 6 3
4 a 3 2 2 2 1 1 3 7
4 b 3 4 8 1 1 1 6 3
5 a 3 2 6 1 3 1 7 3
5 b 3 3 6 1 4 1 7 3
5 c 3 2 4 9 1 7 2
6 2 4 7 1 3
7 1 5 6 2 0 1 4 5
8 4 4 5 2 2
9 1 5 2 1 8 1 8 2
1 0 4 5 3 1 0
1 1 2 7 5 1 5 1 8 2
1 2 3 4 4 7 1 4 6
1 3 a 2 3 3 1 8 1 5 5
1 3 b 2 3 2 8 1 3 7 表 9 (続き)
Figure imgf000032_0001
*次世代についてサザン法による導入遺伝子の分析を行った。
実施例 2
( 1 ) トウモロコシ品種
トウモロコシ品種 A188, Fl (A188 x Black Mexican Sweet), Fl (A 188 x B73Ht) , Fl (B73Ht x A188) , Fl P3732 を材料として選定した。 A188, Black Mexican Sweet, B73Htのいずれの各品種は農林水産省生物資源研究所から、 また、 P3732 は磐田酪農協同組合から各々入手した。
( 2 ) 生長点近傍組織の調製
完熟種子を 70% エタノールに 1分間、 1 次亜塩素酸ナトリウムに 5分間浸漬した 。 滅菌水で 3回洗浄後、 LS固体培地 (Linsmaier and Skoog の無機塩およびビタ ミン類; Linsmaier, E. and Skoog, F. 1965; Physiol. Plant 18: 100-127、 10 O mg/1カザミノ酸、 700 mg/lプロリン、 20 g/1ショ糖、 2.3 g/1 ゲルライ ト) に 置床した。 25°C、 暗黒下で 4日間培養後、 発芽した幼苗から頂端分裂組織を含む 約 0.1 X 0.3腿の組織を切り出し以下の実験に供試した。
(3) 未熟胚由来カルスの調整
未熟胚を L S D 1. 5固体培地 (Linsmaier and Skoog の無機塩およびビタミン 類、 100mg/l カザミノ酸、 700mg/l プロリン、 1.5mg/l 2,4-D 、 20g/l ショ糖、 2.3g/lゲルライ ト) に置床した。 3週間培養後、 形成された胚盤由来カルスを以 下の実験に供試した。
(4) ァグロパクテリゥムの菌系
実施例 1に示したァグロバクテリウムの菌系のうち、 LBA 404(pTOK232)および EH A101(pIG121Hm)を用いた。
(5) ァグロパクテリゥム懸濁液の調整
ハイグロマイシン (50 mg/l ) とカナマイシン (50 mg/l ) を含む AB培地上で 3-10日間培養したァグロパクテリゥムのコロニーを白金耳でかきとり、 実施 例 1に示した修正 A A培地に懸濁し、 菌濃度を 3〜5X 109 細胞/ m lに調整 ,し接種に用いた。
( 6 ) 生長点近傍組織への接種、 培養条件
切り出した組織をガラス針で穿刺後、 上述のァグロパクテリゥム懸濁液に 3~ 1 0分間浸漬した。 浸漬処理後、 100 ァセトシリンゴン、 20 g/1 ショ糖、 1 0 g/1 グルコースを含む修正 L S固体培地 (Linsmaier and Skoog の無機塩類、 Murashige and Skoog のヒタミン ; Murashige, T. and Skoog, F. 1962; Phys iol. Plant. 15:473-497, 0.1 mg/l 力イネチン、 1.0 mg/l カザミノ酸、 2.3 g/1 ゲルライト) に移植し、 25°C、 照明下で 2~3日間培養した。 その後、 250 mg/lセフォタキシムを含む滅菌水で洗浄し、 同濃度のセフォタキシムを含む L S 固体培地で培養を続けた。
(7) カルスへの接種、 培養条件
カルスを前述のァグロパクテリゥム懸濁液に約 5分間浸漬後、 実施例 1に示した ァセトシリンゴンを含む 2N 6固体培地に移植し、 25°C、 暗黒下で 3日間共存 培養をおこなった。 その後カルスを 250mg/l セフォタキシムを含む滅菌水で洗浄 し、 同濃度のセフオタキシムおよび 30mgハハイグロマイシンを含む L SD 1 · 5 固体培地で培養を続け、 形質転換カルスの選抜を行った。
(8) G US活性の調査方法
共存培養処理直後の茎頂組織およびカルス、 その後培養を継続した茎頂組織およ びカルスについて実施例 1の方法にもとづき GU S活性を調査した。
(9) 茎頂組織への遺伝子導入
Gould らの報告 (Gould J., et al. 1991; Plant Physiol. 95:426-434) による 生長点組織 (茎頂組織) を材料とした形質転換が可能である事を確認するため、 前述のァグロバクテリウム菌系 EHA101(pIG121Hm)を単離した茎頂組織に処理し、 生長した植物体での G US活性を調査した。 ァグロパクテリゥム非処理の組織で は、 いずれも GU S遺伝子の発現はみられなかったが、 ァグロパクテリゥム処理 した組織では針で穿剌した部分に G U S遺伝子の発現が小さな点状に認められた 。 し力、し、 その後培養を続けた植物体で GUS活性を調査したところ、 GUS遺 伝子の発現を示すものは全くなかった。 生長点近傍は非常に微細な組織であり、 そこに穿刺しァグロパクテリゥムを感染させることは容易でない。 本実験の結果 から生長点近傍へのァグロバクテリゥムによる形質転換には生長点の切リ出し、 穿刺などに熟練した技術が必要であると考えられた。
10 トウモロコシ茎頂組織への遺伝子導入
Figure imgf000035_0001
供試品種はいずれも P 3732
( 10) トウモロコシの品種および供試菌系による遺伝子導入効率の違い 供試したいずれの品種でも高頻度で GU S遺伝子の発現がみられた。 EHA 10
1 (pIG121Hm)、 LBA4404 (pT0R232) の菌系間での遺伝子発現効率の差は認 められなかった (表 10) 。 処理カルスに対する GUS染色部位の大きさも 10 %以上のものが多く、 広範囲の細胞で遺伝子発現が示された。 供試したァグロバ クテリウムのバイナリベクター P I G 12 l Hmおよび PTOK232は GUS 遺伝子中にヒマのィントロンが介在しているため、 ァグロパクテリゥムの細胞の 中では GU S遺伝子を発現しない。 このことから、 トウモロコシのカルスにおい て認められた G U S遺伝子の発現は、 ァグロパクテリゥムにより高頻度で遺伝子 導入が行われたことを示すものである。 共存培養後、 ハイグロマイシンを含む固 体培地上で培養することにより、 供試カルスの一部でコンパクトでこぶ状のカル スカ S増殖した。 増殖した細胞は GUS遺伝子の発現を示したことから、 形質転換 細胞であると考えられる。 これらのコンパクトでこぶ状の形質転換カルスは Lupo tto らの方法 (Lupotto, E. and Lusardi, M. C. 1988; Maydica XXXI 11 : 163-17 7 ) により再分化可能である。
表 1 1 トウモロコシカルスへの GUS遺伝子の導入効率
Figure imgf000036_0001
BMS: Black Mexican Sweet
菌系 l:EHA101(pIG121Hm), 2:LBA4404(pT0R232)

Claims

口 s求 - の範囲
I . 所望の遺伝子を含有するァグロパクテリゥム属細菌で単子葉植物の脱分化 過程にある培養組織又は脱分化した培養組織を形質転換することから成る単子葉 植物の形質転換方法。
2 . 前記単子葉植物がィネ科植物である請求項 1記載の方法。
3 . 前記単子葉植物がイネである請求項 1記載の方法。
4 . 前記の単子葉植物がトウモロコシである請求項 1記載の方法。
5 . 前記ァグロパクテリゥム属細菌は、 T iまたは R iプラスミドを持つァグ ロバクテリウム属細菌であって、 Agrobacterium tumefaciens の T iプラスミド P T i B o 5 4 2のヴィルレンス領域由来の D N A断片を含むプラスミドを導入 したァグロパクテリゥム属細菌である請求項 1ないし 4いずれか 1項に記載の方 法。
6 . 前記 D N A断片を含むプラスミドは PT0K162又はその誘導体である請求項 5記載の方法。
7 . 前記ァグロパクテリゥム属細菌は、 Agrobacterium tumefaciens である請 求項 1ないし 6のいずれか 1項に記載の方法。
8 . 形質転換操作に用いるァグロパクテリゥム属細菌の菌濃度が 1 06 ~ 1 0 u細胞 Zm 1である請求項 1ないし 7のいずれか 1項に記載の方法。
9 . 前記の培養組織を酵素処理や傷つけるなどの前処理を行わず形質転換に供 する請求項 1ないし 8のいずれか 1項に記載の方法。
1 0 . 前記の培養組織を形質転換に供試した後、 脱分化過程または脱分化状態 で形質転換細胞または形質転換組織を選抜する請求項 1ないし 9のいずれか 1項 に記載の方法。
I I . 前記脱分化過程にある培養組織は、 外植片を脱分化誘導培地に置床後 7 日以上のカルス形成過程にある培養組織である請求項 1ないし 9のいずれか 1項 に記載の方法。
1 2 . 前記培養組織が単子葉植物の体細胞由来の培養組織である請求項 1ない し 1 1のいずれか 1項に記載の方法。
1 3 . 培養組織が正常な個体を再生する能力を有する組織である請求項 1ない し 1 2のいずれか 1項に記載の方法。
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