Dutech C, Rossi J-P, Fabreguettes O, Robin C
INRA, UMR1202 BIOGECO, Domaine de Pierroton, F-33612 Cestas, France.
Mol Ecol. 2008 Nov;17(21):4597-607. doi: 10.1111/j.1365-294X.2008.03941.x.
Spatial genetic analyses can be used to infer dispersal processes in natural populations. For partially clonal species with alternating sexual and asexual reproduction, the repetition of genotypes must be taken into account in analyses. The methods currently employed to evaluate the relevance of the spatial scale used for the estimation of gene flow are not suitable for these species. We investigated recently developed methods for taking into account repeated genotypes and for determining whether the sampling scale is large enough to capture all the spatial genetic structure existing within a population. We applied these methods to a fungal plant pathogen species, Cryphonectria parasitica, which has caused the death of many American and European chestnut trees since its introduction from Asia at the beginning of the 20th century. These methods were found to be useful for unravelling the effects of clonality and historical gene flow on the spatial genetic structure, and indicated that dispersal processes have probably occurred over a larger spatial scale than previously assumed.
空间遗传分析可用于推断自然种群中的扩散过程。对于具有有性和无性繁殖交替的部分克隆物种，在分析中必须考虑基因型的重复情况。目前用于评估估计基因流所使用的空间尺度相关性的方法不适用于这些物种。我们研究了最近开发的方法，这些方法考虑了重复的基因型，并确定采样尺度是否足够大以捕获种群中存在的所有空间遗传结构。我们将这些方法应用于一种真菌植物病原体物种——栗疫病菌，自20世纪初从亚洲引入以来，它已导致许多美洲和欧洲栗树死亡。这些方法被发现有助于揭示克隆性和历史基因流对空间遗传结构的影响，并表明扩散过程可能发生在比以前假设更大的空间尺度上。
