The effect of co-cultivation and selection parameters on Agrobacterium-mediated transformation of Chinese soybean varieties.

Abstract

In the present study, an efficient Agrobacterium-mediated gene transformation system was developed for soybean [Glycine max (L.) Merrill] based on the examinations of several factors affecting plant transformation efficiency. Increased transformation efficiencies were obtained when the soybean cotyledonary node were inoculated with the Agrobacterium inoculum added with 0.02% (v/v) surfactant (Silwet L-77). The applications of Silwet L-77 (0.02%) during infection and L-cysteine (600 mg l(-1)) during co-cultivation resulted in more significantly improved transformation efficiency than each of the two factors alone. The optimized temperature for infected explant co-cultivation was 22 degrees C. Regenerated transgenic shoots were selected and produced more efficiently with the modified selection scheme (initiation on shoot induction medium without hygromycin for 7 days, with 3 mg l(-1) hygromycin for 10 days, 5 mg l(-1) hygromycin for another 10 days, and elongation on shoot elongation medium with 8 mg l(-1) hygromycin). Using the optimized system, we obtained 145 morphologically normal and fertile independent transgenic plants in five important Chinese soybean varieties. The transformation efficacies ranged from 3.8 to 11.7%. Stable integration, expression and inheritance of the transgenes were confirmed by molecular and genetic analysis. T(1) plants were analyzed and transmission of transgenes to the T(1 )generation in a Mendelian fashion was verified. This optimized transformation system should be employed for efficient Agrobacterium-mediated soybean gene transformation.

• Authors: Sheng-Jun Liu, Zhi-Ming Wei, Jian-Qiu Huang
• Journal: Plant cell reports (Plant Cell Rep) Vol. 27 Issue 3 Pg. 489-98 (Mar 2008) ISSN: 0721-7714 [Print] Germany
• PMID: 18004571 (Publication Type: Journal Article)

Chemical References

• Cinnamates
• Hygromycin B
• hygromycin A
• Cysteine

Topics

• Blotting, Southern
• Cinnamates (pharmacology)
• Cysteine (pharmacology)
• Hygromycin B (analogs & derivatives, pharmacology)
• Plants, Genetically Modified
• Polymerase Chain Reaction
• Rhizobium (genetics)
• Soybeans (drug effects, genetics, growth & development)
• Temperature
• Transformation, Genetic (drug effects, genetics)