入侵重庆地区的草地贪夜蛾种群生物型鉴定

草地贪夜蛾是一种跨国迁飞性农业重大害虫,目前已在重庆的巫山、巫溪、云阳、北碚、潼南等地区出现并有迁飞的趋势.利用两个分子标记基因COI和Tpi对重庆地区采集的样本进行遗传特征比较,结果表明COI基因的亚型全为"水稻型",而Tpi基因的亚型既有"水稻型"又有"玉米型",说明入侵到重庆地区的草地贪夜蛾来源可能并不单一,暗示了重庆地区的草地贪夜蛾有可能存在分化为"水稻型"的风险.分析了入侵重庆地区的草地贪夜蛾相关的遗传特征,其结果不仅有助于认识草地贪夜蛾在中国大面积迁飞过程中发生的种群差异变化,也有利于农业部门根据重庆地区的地理环境属性,开展有针对性的监测防控工作.

Biotype Identification of the Population of Spodoptera frugiperda That Migrated to Chongqing Area

Fall armyworm (FAW, Spodoptera frugiperda) is one of the most important agricultural pests, which has a great flight capacity. This insect pest is native to tropical and subtropical regions of the Americas, but recently it has been detected in Wushan, Wuxi, Yunyang, Beibei, Tongnan and other areas of Chongqing. It prefers corn, but can feed on more than 80 additional species of plants, including rice, sorghum and others. In an experiment reported herein, we compared the genetic characteristics of the pest samples collected from Chongqing by using two molecular marker genes (COI and Tpi). The results showed that all the samples belonged to Rice-strain when COI was used as the marker, and both Corn-strain and Rice-strain were present when Tpi was used as the marker, which suggested that the source of S. frugiperda might be variable, and that there is a potential risk of S. frugiperda differentiating into Rice-strain. The analysis of the genetic characteristics of S. frugiperda in Chongqing is helpful to working out corresponding prevention and control measures in combination with the geographical and environmental features in Chongqing, and sheds more light on the understanding of the population differences during the large-scale migration and flight of S. frugiperda in China.