大菱鲆(Scophthalmus maximus)抗鳗弧菌(Vibrio anguillarum)性状的微卫星分子标记研究

THE SCREENING OF MICROSATELLITES MOLECULAR MARKERS WITH REFERENCE TO ANTI-VIBRIO ANGUILLARUM OF TURBOT SCOPHTHALMUS MAXIMUS

采用微卫星分子标记技术分析验证了133对微卫星分子标记,以期为大菱鲆(Scophthalmus maximus)育种提供合适的抗鳗弧菌分子标记。实验鱼经鳗弧菌(Vibrio anguillarum)感染,分为非抗病组与抗病组。对两组鱼PCR扩增出的差异条带进行个体统计,再进行微卫星位点与抗鳗弧菌的相关性分析,并分析对比了两组鱼的遗传多样性。结果表明,微卫星位点Sma-USC108、Sma-USC141的等位基因片段分别在215bp和200bp与抗鳗弧菌性状的正相关性极显著,相关系数分别达到0.363和0.407(P<0.01);微卫星位点FF0911、Sma-USC62、Sma-USC279的等位基因片段分别在189bp、163bp和236bp与抗鳗弧菌性状的负相关性极显著,相关系数分别达到–0.377、–0.364和–0.363(P<0.01)。经过二次验证,最终确定Sma-USC141和FF0911两个微卫星位点可指导大菱鲆抗鳗弧菌的辅助育种。两组大菱鲆的群体遗传多样性分析对比表明:抗病群体与非抗病群体的遗传变异水平较低,两个群体的遗传多样性水平相当。

We explored 133 pairs of microsatellite markers included in Gen Bank to obtain suitable molecular markers that closely associated with anti-Vibrio anguillarum for turbot(Scophthalmus maximus L.) breeding. The experimental turbot by intraperitoneal injection with Vibrio anguillarum were divided into two groups: susceptible group and resistant group. The differential bands in the two turbot groups were selected, from which the correlation between the upper anti-Vibrio anguillarum and the microsatellite loci were analyzed, and the genetic diversity compared. The results show that alleles of Sma-USC108 and Sma-USC141 at 215 bp and 200 bp respectively were extremely significantly correlated with anti-Vibrio anguillarum with the Pearson correlation value of 0.363 and 0.407. On the other hand, alleles of FF0911, Sma-USC62, and Sma-USC279 at 189 bp, 163 bp, and 236 bp, respectively, were extremely significantly negative-correlated with anti-Vibrio anguillarum, with the Pearson correlation values at –0.377, –0.364, and –0.363(P<0.01), respectively. We verified the above result with a second trial and determined that Sma-USC141 and FF0911 is useful for further molecular assistant selection of anti-Vibrio anguillarum turbot. Comparative analysis showed that they two groups were in low genetic variation at a same-level of genetic diversity.