Field efficacy of transgenic cotton containing single and double toxin genes against the Asian corn borer (Lep., Pyralidae)

文献类型： 外文期刊

第一作者： Wang, Z

作者： Wang, Z;Bai, S;Zheng, L;Wang, Y

作者机构：

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

期刊名称：JOURNAL OF APPLIED ENTOMOLOGY （ 影响因子：2.603； 五年影响因子：2.562 ）

ISSN： 1439-0418

年卷期： 2004 年 128 卷 9-10 期

页码：

收录情况： SCI

摘要： Insect resistant transgenic cotton (Gossypium hirsutum L.) is expected to provide satisfactory control of lepidopteran species in the cotton field. The Asian corn borer, Ostrinia furnacalis (Guenee) (Lep., Pyralidae), is an important component of the lepidopteran pest complex of cotton in China. Insect resistant transgenic cotton cultivars GK2, carrying cry1A gene, and SGK321, carrying both cry1A and CpTI genes, were evaluated for resistance to Asian corn borer. Field trials were conducted with artificial infestation of Asian corn borer at squaring, flowering and flowering-boll cotton plants, which coincided with the generations of natural Asian corn borer occurrence. Damage ratings were significantly reduced in transgenic cotton cultivars both GK2 and SGK321 compared with their parental non-transgenic cotton cultivars Simian3 and Shiyuan321, respectively. In addition, percentage of plants stem bored and number of tunnels per plant were significantly higher on GK2 than on SGK321 in the second generation. Laboratory bioassays were carried out by exposing neonates to plant tissues collected from the field. Tissues assayed included the new leaves, 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 SGK321 and GK2, contrasting greatly to the high number of survivors found on their non-transgenic cotton tissue isolated throughout the season. However, larval survival was higher on new leaves isolated from late-season transgenic cotton plants and fruit tissues than on early-season. In addition, higher larval survival was observed on GK2 than SGK321 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 SGK321 and GK2 were highly resistant to Asian corn borer. The high level of efficacy for insect resistant transgenic cotton against Asian corn borer offers the potential for season-long control.

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