Genetic structure of four geographic populations of Locusta migrato ria manilensis in China

作者：Li Chun, MA En, Zheng Xian, Guo Ya · 年份：2004 · 被引用次数：3 · 研究领域：Morphological variations and asymmetry

The genetic structure of the four geographic populations of the Orient al migratory locust Locusta migratoria manilensis was analyzed using horizon tal starch gel electrophoresis. Among 20 loci of 13 isozymes identified, the higher the percentage of polymorphic loci (P=70%-80%), the lower the observed over all heterozygosity (H_o=0.023-0.032). The result from Chi_square test fo r the genoty pe frequencies showed the genotype frequency at most loci deviated significantly from Hardy_Weinberg equilibrium except Adk_1, Gdh_1, G3pd_1 and Pgm_1. Based on F_statistics (average F_(st)= 0.0606), an extremely small g enetic differentiation among the four populations was observed. It appeared that the long_distance mig r ation of the locust enhanced gene flow and decreased genetic differentiation. Th e divergence among four populations was revealed using Nei’s genetic identity ( I) and Roger’s genetic distance (D). The higher the genetic identity, t he small er the genetic distance observed between Shanxi_Linyi and Shanxi_Yongji populati ons (I=0.964, D=0.175), and between Jiangsu_Peixian and Henan_Zhongmou p opulations (I=0.957, D=0.160). The results indicated that there was a positive relationship between genetic differentiation and geographic distance.