福建地区小叶买麻藤遗传多样性ISSR分析

采用13条ISSR引物对福建地区小叶买麻藤11个种群共211个样本进行了种群遗传多样性检测。结果表明:(1)小叶买麻藤在物种水平上遗传多样性较高而在种群水平上较低,揭示该物种具有较强的生存、适应、发展潜力,但其种群遗传多样性已经受到生境片段化及人为活动的影响;(2)小叶买麻藤的遗传分化在裸子植物中处于中等水平,选择和基因流对种群遗传分化的作用大于遗传漂变的作用;(3)小叶买麻藤种群退化主要受人类活动影响,影响的时间较短,尚未表现出种群遗传结构的改变。

Genetic diversity of Gnetum parvifolium of Fujian by ISSR Markers

Thirteen ISSR primers were selected to reveal the population genetic diversity of Gnetum parvifolium in Fujian. 211 samples across 11 populations were examined. The results showed that:(1)G.parvifolium exhibited comparatively high genetic diversity at species level while comparatively low at population level,indicating that this species had a strong potential for survival,adaptation and expansion,but its population genetic diversity had been effected by habitat fragmentation and human activity;(2)the genetic differentiation of G.parvifolium was among the moderate level of gymnosperm,which was mainly caused by selection pressure and gene flow instead of genetic drift;(3)human activities contributed to the population degradation of G.parvifolium,but this degradation had little detectable effect on the genetic structure of the target species due to limited impactive time.