Study on Detection Technology and Survival Competitiveness of Transgenic Cry1Ac plus Cry2Ab Cotton in Case of Target Pests Not Be Controlling

[Objective] The research aimed to establish a new environmental safety evaluation technology for transgenic Cry1Ac plus Cry2Ab cotton.[Method] The test detected production competitiveness of transgenic Cry1Ac plus Cry2Ab cotton in case of the target pest not be controlling,the two CK were Ganmianza No.1 and Ganmian No.11,the former was the hybrid cotton,the latter was non-transgenic cotton.[Result] The insect resistance of transgenic Cry1Ac plus Cry2Ab cotton was stronger than the two CK,but the difference was not significant;the height,coverage,fruit branch layer and boll shell weight competitiveness of transgenic Cry1Ac plus Cry2Ab cotton were not advantage with two control;seed cotton weight and lint weight of boll,lint percentage competitiveness of transgenic Cry1Ac plus Cry2Ab cotton were weaker than two CK,the difference was significant or extremely significant;the boll number,drop rate and seed yield competitiveness of transgenic Cry1Ac plus Cry2Ab cotton were not advantage with Ganmianza No.1,and were significant or extremely significant with Ganmian No.11;lint yield competitiveness of transgenic Cry1Ac plus Cry2Ab cotton was weaker than Ganmianza No.1 and stronger than Ganmian No.11,the difference of them was extremely significant.[Conclusion] The cultivation feasibility of transgenic Cry1Ac plus Cry2Ab cotton was general.Detection technology and evaluation methods in the test were applied practically.