广西红树植物桐花树种群遗传多样性分析

采用RAPD-PCR方法探讨广西3个不同生境下桐花树种群的遗传多样性和遗传分化。结果表明:3个不同生境桐花树RAPD扩增多态百分率为20.2%,3个不同生境桐花树种群两两之间的遗传距离分别为0.195、0.169、0.26,平均遗传距离为0.208。同一种群不同个体的扩增多态百分率最高为37.28%,其次为20.93%,最小的为19.32%。Shannon’s遗传多样性指数3个种群分别为0.331、0.225和0.17,其大小顺序与多态百分率的结果一致。种群内遗传多样性比率为62.3%,种群间遗传多样性比率为37.7%。说明广西3个不同生境的桐花树种群的遗传变异大部分存在种群内,种群间遗传变异较小。

Study on genetic diversity of mangrove plant Aegiceras corniculatum populations in Guangxi

RAPD-PCR markers were used to investigate the genetic diversity and genetic differentiation among 3 populations with different habitats of Aegiceras corniculatum in Guanxi.The results showed that percentage of polymorphic band was 20.2%,and genetic distances among 3 A.corniculatum populations were 0.195,0.169 and 0.26,respectively,and 0.208 on average.The percentage of polymorphic band and Shonnon’s diversity index among individuals within the same population had the same trend,and each was 37.28% and 0.331,20.93% and 0.225,19.32% and 0.17.A large proportion of genetic variance(62.3%)of A.corniculatum was among individuals within population,while only 37.7% genetic variance was among populations.