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首页> 外文期刊>Mycologia >Within-population genetic structure differs between two sympatric sister-species of ectomycorrhizal fungi, Rhizopogon vinicolor and R. vesiculosus.
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Within-population genetic structure differs between two sympatric sister-species of ectomycorrhizal fungi, Rhizopogon vinicolor and R. vesiculosus.

机译：两种外生菌根真菌的同胞姐妹物种，根瘤菌Rinizopogon vinicolor和R. vesiculosus的种群内遗传结构不同。

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摘要

Using spatial autocorrelation analysis, we examined the within-population genetic structure of Rhizopogon vinicolor and R. vesiculosus, two hypogeous ectomycorrhizal (EM) species that are sympatric sister taxa known to differ in their clonal structure. We collected 121 sporocarps and 482 tuberculate EM of both species from a 20 ha forest stand dominated by Douglas-fir (Pseudotsuga menziesii). Field collections were identified to species with restriction fragment length polymorphism analysis of the nuclear ribosomal internal transcribed spacer. Five and six microsatellite markers were used to characterize the genetic diversity of EM and sporocarp samples from R. vesiculosus and R. vinicolor respectively. After correcting for genet structure, spatial autocorrelation analyses of the EM samples were used to test the null hypothesis that multilocus genotypes characterized from each species were randomly distributed within the study area. We detected positive and statistically significant fine-scale genetic structure up to 120 m within the R. vesiculosus sample. In contrast, no spatial genetic structure was evident for R. vinicolor, indicating that the genotypes characterized for this species were randomly distributed throughout the study area. Differences in statistical power or the nuclear count of basidiospores are unlikely agents of the genetic patterns observed. Our results suggest that differences in reproductive output or competitive ability may act individually or in combination to create clusters of similar genotypes for R. vesiculosus throughout the study area.
机译：使用空间自相关分析，我们检查了两个根深蒂固的外生菌根（EM）物种Rhizopogon vinicolor和R. vesiculosus的种群内遗传结构，这是同胞姊妹类群，其克隆结构有所不同。我们从占地20公顷的道格拉斯冷杉（Pseudotsuga menziesii）占主导地位的林分中收集了121个孢子果和482个具结节菌的EM。通过核糖体内部转录间隔区的限制性片段长度多态性分析，对田间物种进行了鉴定。使用五个和六个微卫星标记来表征来自R. vesiculosus和R. vinicolor的EM和孢子果样品的遗传多样性。校正种系结构后，对EM样品进行空间自相关分析，以检验零假设，即每种物种表征的多基因座基因型在研究区域内随机分布。我们在R. vesiculosus样本中检测到长达120 m的阳性且具有统计意义的精细规模遗传结构。相比之下，没有针对R. vinicolor的空间遗传结构，表明该物种的特征基因型随机分布在整个研究区域。担子孢子的统计能力或核计数的差异不太可能是观察到的遗传模式的媒介。我们的研究结果表明，在整个研究区域内，生殖产量或竞争能力的差异可能会单独起作用，也可能会共同作用，从而为葡萄球菌产生相似基因型的簇。

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