文献类型： 外文期刊

作者： He, KL ¹ ; Wang, ZY ² ; Bai, SX ² ; Zheng, L ² ; Wang, YB ² ; Cui, HY ³ ;

作者机构： 1.Chinese Acad Agr Sci, State Key Lab Biol Plant Dis & Insect Pests, Inst Plant Protect, Beijing 100094, Peoples R China

2.Chinese Acad Agr Sci, State Key Lab Biol Plant Dis & Insect Pests, Inst Plant Protect, Beijing 100094, Peoples R China; Hebei Acad Agr & Forestry Sci, Dryland Farming Inst, Hengshui, Hebei, Peoples R China

3.Chinese Acad Agr Sci, State Key Lab Biol Plant Dis & Insect Pests, Inst Plan

关键词： Bt cotton;transgenic plant;host plant resistance;Ostrinia furnacalis

期刊名称：CROP PROTECTION （ 影响因子：2.571； 五年影响因子：3.11 ）

ISSN： 0261-2194

年卷期： 2006 年 25 卷 2 期

页码：

收录情况： SCI

摘要： Transgenic Bt cotton is expected to provide satisfactory control of several lepidopteran species in cotton. The Asian corn borer (ACB), Ostrinia furnacalis (Guenee), is an important component of the lepidopteran pest complex of cotton in China. Monsanto's transgenic Bt cotton NC 3313, expressing CrylAc protein, and a Chinese transgenic Bt cotton GK-2, expressing Cry I A protein, were evaluated for resistance to ACB during 2001-2002. Field trials were conducted with an artificial infestation of ACB at different cotton crop stages, which coincided with the generations of natural ACB occurrence. Damage ratings were significantly reduced in transgenic cotton cultivars both NC 33B and GK-2 compared with their parental non-transgenic Bt cotton cultivars DP5415 and Simian 3, and a major conventional cultivar Shiyuan 321, respectively. In addition, percentage of plants stern-bored and mean number of tunnels per plant were significantly higher on GK-2 than on NC 33B in the second generation. Laboratory bioassays were carried Out by exposing neonates to plant tissues collected from the field during the season. Tissues assayed included the new leaves, floral buds, match-head squares, and white flowers, which are the tissues initially attacked by the neonates in the field. Low larval survival rates were observed on NC 33B and GK-2, contrasting greatly to the high number Of Survivors found on equivalent non-Bt cotton tissue isolated throughout the season. However, larval survival was higher on the tissues isolated from late-season Bt cotton plants than on early season. In addition, higher larval survival was observed on GK-2 than NC 33B in assays with the late season tissues. This may be associated with reduced levels of available toxin in plant tissues as they age. Both laboratory and field data indicated that NC 33B and GK-2 were highly resistant to ACB. The high level of efficacy for Bt cotton against ACB offers the potential for season-long control. (c) 2005 Elsevier Ltd. All rights reserved.