Wu Kongming, Guo Yuyuan, Lv Nan, Greenplate John T, Deaton Randy
Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100094, PR China.
J Econ Entomol. 2003 Aug;96(4):1322-8. doi: 10.1093/jee/96.4.1322.
NuCOTN 33B, a Bt transgenic variety of upland cotton (Gossypium hirsutum L.) expressing the insecticidal protein Cry1Ac from Bacillus thuringiensis Berliner sp. kurstaki, was evaluated for resistance to Helicoverpa armigera (Hübner) during 1998-2000 in northern China. The results indicated that there was no significant difference in egg densities between NuCOTN 33B and three nontransgenic varieties (DP5415, Zhongmian12, and Shiyuan321) during the season, although the survival of larvae on NuCOTN 33B seemed significantly reduced. High larval densities observed on non-Bt cotton appeared in great contrast to the low larval populations observed on NuCOTN 33B plants during the seasons. In an environment without insecticide sprays, the annual ginned cotton yields in NuCOTN 33B plots, ranging from 1391.17 to 1511.35 kg/ha, were significantly higher than those in non-Bt cotton (340.34-359.58 kg/ha). These high levels of field efficacy for NuCOTN 33B against H. armigera in northern China may pave the way for reduced pesticide applications and an expansion of alternative pest-control strategies.
NuCOTN 33B是陆地棉（陆地棉）的一种Bt转基因品种，表达来自苏云金芽孢杆菌kurstaki亚种的杀虫蛋白Cry1Ac，于1998 - 2000年在中国北方对其进行了棉铃虫抗性评估。结果表明，尽管NuCOTN 33B上幼虫的存活率似乎显著降低，但该品种与三个非转基因品种（DP5415、中棉12和石远321）在整个季节的卵密度没有显著差异。在非Bt棉花上观察到的高幼虫密度与在该季节NuCOTN 33B植株上观察到的低幼虫数量形成了鲜明对比。在不喷洒杀虫剂的环境中，NuCOTN 33B地块的皮棉年产量为1391.17至1511.35千克/公顷，显著高于非Bt棉花（340.34 - 359.58千克/公顷）。NuCOTN 33B在中国北方对棉铃虫的这种高水平田间防效可能为减少农药使用和扩大替代害虫控制策略铺平道路。
