作　　者： ; ; ;

机构地区： 南京农业大学植物保护学院昆虫学系

出　　处： 《生态学报》 2004年第7期1566-1569,共4页

摘　　要： 波动性不对称 (Fluctuating asymm etry,FA)是指相对于生物两侧对称发育的一种细微的随机偏离 ,通常用来指示生物在外界环境压力下发育的稳定性程度。 2 0 0 2年在我国北方棉区 1 3个具有 1～ 5 a转 Bt基因棉种植史的市、县采集了棉铃虫上灯蛾 ,测定了各点成虫后足腿节的波动性不对称 (Fluctuating asymmetry,FA)。结果表明 ,1 2个采集地的棉铃虫后足腿节均表现出 FA;相关性分析发现 ,各采集点的 FA值与 Bt棉的种植年代间存在着显著的负相关关系 (r=- 0 .77) ,显示出棉铃虫自然种群对 Bt棉的适应性随着 Bt棉种植时间延长而渐增的趋势。讨论了棉铃虫对 Bt棉的适应以及 FA作为棉铃虫田间种群对 Organisms are subject to three types of morphological asymmetry: Directional asymmetry, Antisymmetry and Fluctuating asymmetry, but only the latter is related to the environmental stress acting upon individuals during their developmental. Fluctuating asymmetry (FA), small random differences between left and right, with a low level of heritability, has been widely used as a measure of developmental stability. In this study, we test the levels of FA in populations of cotton bollworn (Helicoverpa armigera, CB) exposed to different stress levels of Bt-transgenic cotton. In 2002, thirteen field populations of CB moth were collected in light traps from four provinces in northern China, where transgenic Bt-cotton had been planted for one to five years. FA of the hind femurs of the light trap catches in response to the stress of Bt cotton was estimated. The results show that twelve of the field populations demonstrated FA, and that there was a tendency for the level of FA to decrease as the period over which Bt-cotton had been grown increased. Pearson's correlation coefficient weighted between levels of FA and history of Bt-cotton growing was -0.77, with this coefficient being highly significant. This trend means that the adaptation of field populations of CB to Bt cotton will increase with increasing exposure to Bt-cotton. The feasibility of FA as an indicator for monitoring the appearance of CB resistance to Bt-cotton is discussed.

关 键 词： 棉铃虫 棉种植史 波动性不对称

领　　域： [生物学]