Inheritance of resistance toHelicoverpa armigera of 3 kinds of transgenicBt strains available in upland cotton in China |
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| Authors: | Canming Tang Jing Sun Xiefei Zhu Wangzhen Guo Tianzhen Zhang Jinliang Shen Congfen Gao Weijun Zhou Zhixian Chen Sandui Guo |
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| Affiliation: | (1) Key Laboratory of Crop Germplasm and Breeding, Ministry of Agriculture; Department of Agronomy, Nanjing Agricultural University, 210095 Nanjing, China;(2) Department of Plant Protection, Nanjing Agricultural University, 210095 Nanjing, China;(3) Cotton Research Institute, Shanxi Academy of Agricultural Sciences, 044000 Yuncheng, China;(4) Biotechnology Research Centre, Chinese Academy of Agricultural Sciences, 100081 Beijing, China |
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| Abstract: | There are 3 kinds of transgenicBt strains, Shanxi 94-24, Zhongxin 94, and R19, in upland cotton in China. Their transgenicBt insect-resistance cultivars or hybrids have been developed and grown by farmers. Genetic studies indicate that the resistance of the 3 transgenicBt cotton strains toHelicoverpa armigera is controlled by one pair of non-allelic dominant genes. Linkage relationship between the resistant genes of R19 and Shanxi 94-24 transgenicBt strains shows that they may be inserted in the same chromosome. F1 hybrids crossed among the 3 strains show that high levels of protection from feeding damage are the same as that of their parents. Therefore, there is no co-suppression phenomenon in many transgenic plants. The results presented here afford a fundamental reliance in developing transgenicBt insect-resistant cultivars and exploiting the heterosis of hybrids in upland cotton. |
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| Keywords: | upland cotton transgenicBt plant inheritance insect-resistance Helicoverpa armigera |
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