微生境对鼎湖山锥表观遗传变异的影响

Effect of Microhabitat on Epigenetic Variation of Dinghu Mountain Castanopsis chinensis Hance

摘要:

为了解种群内水平上影响植物的适应机制与空间格局关系的因素，对鼎湖山2个演替阶段林分锥（Castanopsis chinensis）种群通过DNA甲基敏感扩增片段多态性进行表观遗传特征分析，结果表明，微生境对表观遗传变异的贡献由成熟林的20.2%降低为过熟林的15.7%，但地形因素的影响却增大，同时微生境中具体起显著作用的环境因素在两个林分也不同。因此，微生境特征对种群适应机制和分布格局有显著影响，对演替阶段也有影响。

Abstract:

In order to understand the effect factors on the relationship between plant adaptation mechanism and spatial pattern within population, epigenetic variation characteristics of two populations of Castanopsis chinensis at different succession stages in Dinghushan were analyzed by using DNA methyl-sensitive amplified fragment polymorphism (MSAP). The results showed that the contribution of microhabitats to epigenetic variation decreased from 20.2% in mature forests to 15.7% in over-mature forests, but the influence of topographic factors increased. At the same time, the environmental factors in microhabitats that played a significant role to methylation variation were different between the two forests. So, it was suggested that microhabitat characteristics had partial significant effects on population adaptation mechanism and distribution pattern, and did the succession stage.