Abstract:

The research studied for establishing the environmental safety assessment technologies of bivalent insect-resistant Bt genes (Cry1Ac+Cry2Ab) transferred cotton in China. The observation variety was transgenic cotton harboring Cry1Ac+Cry2Ab double genes, and the non-transgenic cotton ‘Ganmian No.11’ as control variety. The biological characteristics contained the growth traits and the yield traits were analyzed in this research. The results showed that, the height growth of the transgenic cotton with two Bt genes was not significant compared with the control (increased 3.3-4.7 cm to control); the bell number, the first branch height, total fruit nodes, the node length of the main stem, Micronaire value and fiber uniformity index were increased 12.5 bolls, 3 cm, 10.2 bolls, 0.5 cm, 0.787, 1.025% significantly (P<0.05), respectively.the leaf color deepened significantly(P < 0.05), too. The seed cotton yield, lint yield, cotton seed index and the germination rate increased 267.0 kg/hm2, 118.35 kg/hm2, 1.65 g and 2.75% compared to control significantly (P < 0.01), respectively. But the yield of unginned cotton before frost, pre-frost lint yield, single boll weight, single boll lint weight and the single boll lint weight decreased compared to control 220.95 kg/hm2, 88.5 kg/hm2, 0.54 g, 0.44 g and 0.18 g significantly (P < 0.01), respectively. There were some inferiorities in growth traits and yield traits in the transgenic cotton harboring Cry1Ac+Cry2Ab double Bt genes, the yield and the fiber quality uniformity is better than the control, so the promotion application value in general.