Up-regulated death-associated LIM-only protein contributes to fitness costs of Bacillus thuringiensis Cry1Ac resistance in Helicoverpa armigera

文献类型： 外文期刊

第一作者： Lu, Guoqing

作者： Lu, Guoqing;Su, Xiaofeng;Cheng, Hongmei;Liang, Gemei;Liu, Chenxi

作者机构：

关键词： Helicoverpa armigera;HaDALP gene;Cry1Ac resistance;Fitness costs

期刊名称：JOURNAL OF INSECT PHYSIOLOGY （ 影响因子：2.354； 五年影响因子：3.045 ）

ISSN： 0022-1910

年卷期： 2014 年 60 卷

页码：

收录情况： SCI

摘要： The evolution of Bacillus thuringiensis (Bt) resistance provides a useful pathway for the study of fitness trade-offs associated with stress adaptation. In a previous study, we used cDNA-amplification fragment length polymorphism (cDNA-ALFP) analysis to identify differentially expressed genes (DEGs) in Cry1Ac-susceptible (96S) and -resistant (Bt-R) Helicoveipa armigera larvae. Among these DEGs, a death-associated LIM-only protein (HaDALP) was identified. In the current study, the full-length cDNA encoding HaDALP was cloned using rapid amplification of cDNA ends according to an expressed sequence tag derived from the previous cDNA-ALFP analysis. HaDALP expression patterns indicated that this gene was differentially expressed in tissues and stages and was highest in the midgut and epidermis of the 5th instar larvae. It is up-regulated in Cry1Ac-resistant H. armigera larvae. Fitness parameters, such as larval and pupal weight, pupal duration, and survival rate, which are the most sensitive indicators, were evaluated after HaDALP knockdown or feeding of the HaDALP protein in vivo. Our findings suggested that up-regulation of HaDALP might be related to Cry1Ac resistance and an adaption to Bt toxins. (C) 2013 Elsevier Ltd. All rights reserved.

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