【摘要】 应用AFLP分子标记技术对我国沿海大竹蛏(Solen grandis)群体的遗传多样性进行了分析,利用筛选出的7对AFLP引物,对丹东、烟台、莱州、日照和南通5个地理群体的141只大竹蛏个体进行了扩增,共得到了403个位点,片段大小在100—700bp之间。其中丹东、烟台、莱州、南通4个群体的大竹蛏遗传多样性水平接近,日照群体的多态位点比例高于其它4个群体,结合Shannon’s信息指数(I)和Nei’s基因多样性指数(H)看,日照群体的遗传多样性水平最高,而南通群体的遗传多样性水平最低。AMOVA分析得到群体间遗传分化系数Φst=0.2250(P<0.001),群体间的变异百分率为22.5%,群体内为77.5%,说明群体的遗传变异主要来源于群体内个体间的遗传差异,但群体间也存在一定程度的基因渗透。更多还原

【Abstract】 The AFLP (Amplified fragment length polymorphism) technology was used to estimate the genetic diversity of Solen grandis from several coastal sites of China. 141 natural individuals from 5 geographical populations of S. grandis located at Dandong (DD), Yantai (YT), Laizhou (LZ), Rizhao (RZ), and Nantong (NT) were analyzed using 7 pairs of AFLP primers. A total of 403 reproducible loci were generated, most of which varied from 100bp to 700bp. There was little different in the genetic diversity of DD, YT, LZ and NT, whereas the ratio of polymorphic loci of RZ was relatively higher than the other four populations. Combined with the Shannon’s index and Nei’s genetic diversity index, RZ had the highest genetic diversity and NT had the lowest. AMOⅤA analysis showed that the genetic differentiation coefficient of S. grandis populations (Φst ) was 0.2250 (P<0.001) and there was 77.5% genetic differentiation within the populations and 22.5% among the populations. These results indicated the genetic diversity detected was mainly caused by individual differences within a population, but there was somewhat gene flow between the populations.更多还原