中国栗疫病菌群体遗传结构的空间自相关性分析

应用空间自相关分析方法对中国栗疫病菌17个居群RAPD遗传变异的空间结构进行研究，以探讨栗疫病菌居群遗传变异的分布特征及其形成机制。结果表明：中国栗疫病菌居群缺乏空间结构，绝大多数RAPD位点变异为随机分布的空间模式，但部分位点表现出渐变、斑块和双向渐变的非随机分布模式，又显示了一定的空间结构。推测其形成原因可能是长距离的基因流、人类活动、地理隔离以及栗疫病菌本身的繁殖特性综合作用的结果，并依据部分位点呈单向渐变的模式推测西南地区为中国栗疫病菌的起源中心。

Spatial Autocorrelation of Population Genetic Structure of Cryphonectria parasitica in China

The spatial structure of genetic diversity among 17 populations of Cryphonectria parasitica in China was investigated using RAPD markers with the spatial autocorrelation analysis. The result revealed a lack of spatial structure of genetic variation among populations of C. parasitica indicating a fact that genetic variations of the most polymorphic loci were randomly distributed. However, cline depression, lump, or double cline structures of the genetic variation were found at some RAPD loci with significant Moran's I in several distance classes. The spatial patterns of genetic differentiation in populations appeared to be a combining result of long-distance gene flow, human activities, local effects of geographic isolation and reproduction behaviour of C. parasitica, and it speculated that Southwest China could be a possible center of C. parasitica origin in China based on the cline pattern at some loci.