Soybean transformation and regeneration methods
First Claim
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1. A method of regenerating soybeans (G. max) via organogenesis, comprising:
- obtaining hypocotyl explants from germinated seedlings of soybean plants whose regeneration is desired,maintaining said hypocotyl explants on a shoot induction medium comprising a cytokinin until shoots form at the acropetal end of said hypocotyl explant,excising shoots from said hypocotyl explant and maintaining said shoots on a shoot elongation medium until said shoots are competent on a rooting medium, and maintaining said shoots on a rooting medium until rooted plantlets are formed, andtransplanting said plantlets to soil.
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Abstract
A method of transforming and regenerating soybean plants relies on selection of hypocotyl explants as the target material. Hypocotyl explants can be transformed either by microparticle bombardment with DNA-coated microparticles of inert metals, or by co-culturing with an Agrobacterium strain. The transformed explants can be successfully regenerated, using a protocol including culturing on a shoot induction medium, followed by transfer to a shoot elongation medium to form rooted plantlets, which are transplanted to soil.
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11 Claims
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1. A method of regenerating soybeans (G. max) via organogenesis, comprising:
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obtaining hypocotyl explants from germinated seedlings of soybean plants whose regeneration is desired, maintaining said hypocotyl explants on a shoot induction medium comprising a cytokinin until shoots form at the acropetal end of said hypocotyl explant, excising shoots from said hypocotyl explant and maintaining said shoots on a shoot elongation medium until said shoots are competent on a rooting medium, and maintaining said shoots on a rooting medium until rooted plantlets are formed, and transplanting said plantlets to soil. - View Dependent Claims (2, 3, 4, 5, 6, 8, 11)
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7. A method for transforming soybean plants to express exogenous DNA, comprising:
obtaining a hypocotyl explant from germinated seedlings of a soybean plant, maintaining said explant on a shoot induction medium comprising a cytokinin for 16-32 hours, bombarding said explant, with the acropetal end facing up, with microparticles of an inert metal coated with exogenous DNA comprising a plasmid which comprises an expression gene, said expression gene encoding the expression of a protein exogenous to said soybean plant, maintaining said bombarded hypocotyl explant on a medium selective for growth of transformed tissues, followed by maintenance on a shoot elongation medium and preparing plantlets from shoots so obtained. - View Dependent Claims (9)
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10. A method of transforming soybeans, comprising obtaining a hypocotyl soybean explant from germinated seedlings, and maintaining on its side or upright on a shoot induction medium comprising a cytokinin with a basipetal end thereof submerged in said medium,
pre-culturing and/or co-culturing an Agrobacterium strain with a virulence enhancing substance, and adding said pre- or co-cultured bacteria to the acropetal end of said upright hypocotyl explant or by complete submersion, co-incubating said hypocotyl explant for a time sufficient to permit transfection of said hypocotyl explant by said bacteria, disinfecting said hypocotyl explant, maintaining said hypocotyl explant on a shoot induction medium and assaying said explant for expression of introduced foreign DNA, and regenerating hypocotyl explants positive for expression of said DNA.
Specification