摘要
利用9种限制性内切酶对D.virilis兰州群体作了mtDNA的RFLP分析，结合其他地区D.virilis群体的mtDNA的RLFLP数据，用UPGMA法构建了聚类图。发现大陆D.virilis聚成明显的3支：兰州和青岛群体、华东群体、福建群体，呈一纬度梯度分布。单纯以地理隔离不能解释D.virilis然群体间的遗传差异。温度依赖性的选择可能是纬度梯度分布的维持机制。
In this paper we analysed the RFLP of mtDNA in Lanzhou (LZ) population of D. virilis. By reanalysing the RFLP data of our previous work on other natural populations of D. virilis, a phylogenetic tree was produced based on the UPGMA method. It shows three main clusters: the Northern populations (LZ QD), the East China populations (NJ, SH, NB) and the Southern population (QZ). With the mtDNA' s RFLP data and the results of our former work on allozyme variation in natural populations of D. virilis, we suggest that there exists a latitudinal cline of genetic variation in natural populations of D. virilis. The mechanism for the maintenance of the observed latitudinal pattern is discussed.
基金
国家自然科学基金!39670395
关键词
群体遗传多态
纬度梯度
黑果蝇
D. virilis, Population genetic polymorphism, Latitudinal cline
