Limited divergence among populations of rice striped stem borer in southeast China caused by gene flow: Implications for resistance management

文献类型： 外文期刊

第一作者： Yang, Chao

作者： Yang, Chao;Yang, Xiao;Xu, Kai;Lu, Bao-Rong;Fu, Qiang

作者机构：

关键词： assignment;Chilo suppressalis;genetic differentiation;migration;molecular fingerprint;polymorphism

期刊名称：JOURNAL OF SYSTEMATICS AND EVOLUTION （ 影响因子：4.098； 五年影响因子：4.735 ）

ISSN： 1674-4918

年卷期： 2012 年 50 卷 5 期

页码：

收录情况： SCI

摘要： Rice striped stem borer (RSSB, Chilo suppressalis) is a serious lepidopteron pest occurring in rice ecosystems of Asia and Europe. Genetically modified (GM) insect-resistant Bt rice has been developed to deter lepidopteron pests including RSSB. The concern of resistance evolution to the Bt toxin by the pests under commercial cultivation of GM Bt rice and the need of effective management of the resistance encourage the studies of genetic variation and divergence, as well as gene flow of RSSB populations. We analyzed 13 RSSB populations fed on water-oats or rice plants, respectively, from southeast China applying the fluorescent amplified fragment length polymorphism fingerprints. A generally moderate level of genetic variation was detected in the populations, as estimated by Nei's genetic diversity (0.27) and Shannon's index (0.42). The FST and amova values indicated a low level (similar to 12%) of genetic divergence among the RSSB populations. A relatively frequent gene flow (an average Nm = 2.62) was detected among the 12 RSSB populations, which may explain the limited genetic divergence among the rice-feeding populations. This explanation gains support by the assignment test of the corresponding populations, suggesting that a considerable proportion of individuals was contributed from non-native populations. Our results revealed that the moderate level of genetic diversity combined with relatively frequent gene flow among RSSB populations across a large geographical range may slow down the resistance evolution of the RSSB populations, given that a proper measure of resistance management is taken.

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