期刊
PEST MANAGEMENT SCIENCE
卷 67, 期 4, 页码 414-422出版社
WILEY
DOI: 10.1002/ps.2079
关键词
transgenic rice; Bacillus thuringiensis; gene stacking; insect resistance management; stemborer; leaffolder
资金
- National Programme on Research and Development of Transgenic Plants
- National High Technology Research and Development Programme of China (863 Programme)
- National Natural Science Foundation of China
- National Programme on Research and Development of Transgenic Plants
- National High Technology Research and Development Programme of China (863 Programme)
- National Natural Science Foundation of China
BACKGROUND: Transgenic crops that produce insecticidal toxins from the bacterium Bacillus thuringiensis Berliner (Bt) were first commercialised in 1996. The risk that pests have the potential to evolve resistance to Bt toxins is one of the most serious challenges to this technology. Gene stacking, pyramiding two Bt genes into one variety, is considered to be an effective insect resistance management (IRM) strategy. In this study, insect-resistant rice expressing two Bt genes was developed by sexual crossing, and then characterised. RESULTS: Homozygous rice lines of two pyramided Bt genes were obtained in the F-3 generation. Quantification of Bt toxin showed that protein concentrations of Cry1Ab, Cry1Ac and Cry2A in the two-gene lines were comparable with their single-gene parents, while the expression of cry1C gene decreased after gene stacking. Four two-gene lines showed higher activity to striped stem borer (Chilo suppressalis Walker) than parental lines in the laboratory bioassay. All pyramided lines and their hybrids exhibited excellent efficacy against stemborers and leaffolders in field evaluation, while most pyramided lines had no significant differences from original variety in yield under spraying of insecticide. CONCLUSION: These results demonstrate that the two-gene lines have commercial potential and could serve as a valuable IRM strategy. (C) 2011 Society of Chemical Industry
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