不同地区桐花树种群的分子遗传变异分析

The Study on Genetic Diversity of Aegiceras corniculatum Populations in Different Areas

利用RAPD和ISSR两种分子标记,对4个不同纬度桐花树种群的遗传多样性和遗传分化进行探讨,根据RAPD和ISSR数据计算遗传距离并进行聚类分析.结果表明,4个种群桐花树遗传变异性低,4个纬度桐花树种群分为南北两个类群,海南和广西为1个类群,广东和福建为1个类群.利用Shannon's指数计算4个种群的遗传多样性,广西种群多样性指数最高,福建种群最低.大部分的遗传变异存在于种群内(64%),小部分的遗传变异存在种群间(36%).本文同时探讨了种群遗传保护和引种策略.

RAPD and ISSR molecule markers were used to detect genetic diversity and genetic differentiation of Aegiceras corniculatum populations in different latitudes.The results showed that genetic variation of four populations was low.Percentage of polymorphic bands of RAPD and ISSR were 21.66% and (26.77%).Based on UPGMA cluster analysis,it showed that four Aegiceras corniculatum populations were divided into two groups:the south and the north.There were some evidences showing noticeable correlation existing between the variations and the geographical latitudes.Shonnon diversity index indicated that 64% variation existed within populations and 36% variation existed among populations.This study discussed about genetic diversity protection of population and strategy of plant introduction.