广西红树植物桐花树种群遗传多样性分析

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

关键词:  红树林  桐花树  种群  遗传距离  遗传多样性  RAPD

Key words:  angrove  Aegiceras corniculatum  populations  genetic distances  genetic diversity  RAPD

摘要:

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。

Abstract:

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.