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Transgenic japonica rice expressing the cry1C gene is resistant to striped stem borers in Northeast China
JIN Yong-mei, MA Rui, YU Zhi-jing, LIN Xiu-feng
2021, 20 (11): 2837-2848.   DOI: 10.1016/S2095-3119(20)63279-8
Abstract159)      PDF in ScienceDirect      
Rice production and quality are seriously affected by the lepidopteran pest, striped stem borer (SSB), in Northeast China. In this study, a synthetic cry1C gene encoding Bacillus thuringiensis (Bt) δ-endotoxin, which is toxic to lepidopteran pest, was transformed into a japonica rice variety (Jigeng 88) in Northeast China by Agrobacterium-mediated transformation.  Through molecular detection and the Basta resistance germination assay, a total of 16 single-copy homozygous transgenic lines were obtained from 126 independent transformants expressing cry1C.  Finally, four cry1C-transgenic lines (JL16, JL23, JL41, and JL42) were selected by evaluation of the Cry1C protein level, insect-resistance and agronomic traits.  The cry1C-transgenic lines had higher resistance to SSB and higher yield compared with non-transgenic (NT) control plants.  T-DNA flanking sequence analysis of the transgenic line JL42 showed that the cry1C gene was inserted into the intergenic region of chromosome 11, indicating that its insertion may not interfere with the genes near insertion site.  In summary, this study developed four cry1C-transgenic japonica rice lines with high insect resistance and high yield.  They can be used as insect-resistant germplasm materials to overcome the problem of rice yield reduction caused by SSB and reduce the use of pesticides in Northeast China.
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Development of lepidopteran pest-resistant transgenic japonica rice harboring a synthetic cry2A* gene
JIN Yong-mei, MA Rui, YU Zhi-jing, WANG Ling, JIANG Wen-zhu, LIN Xiu-feng
2015, 14 (3): 423-429.   DOI: 10.1016/S2095-3119(14)60897-2
Abstract1504)      PDF in ScienceDirect      
A synthetic cry2A* gene encoding Bacillus thuringiensis (Bt) δ-endotoxin that resistance to lepidopteran pest was transformed into japonica rice variety Jijing 88, which is the most widely cultivated variety in Jilin Province, Northeast China, by Agrobacterium-mediated transformation. A total of 106 independent transformants overexpressing cry2A* gene driven by ubiquitin (Ubi) promoter was produced. Three single-copy homozygous transgenic lines were finally selected based on the results of PCR analysis, segregation ratio of Basta resistance, and Southern hybridization analyses. RT-PCR and enzyme linked immune sorbent assay (ELISA) revealed that cry2A* transcripts and protein were highly expressed in these lines. The high level of Cry2A* protein expression resulted in high resistance to rice striped stem borer as evidenced by insect feeding bioassays. Our results demonstrate that cry2A* transgenic japonica rice confers resistance to the rice striped stem borer in the laboratory conditions.
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