Genetic variation in Phytophthora sojae was compared between northern (NPS) and southern (SPS) Pampeana sub‐regions, in the core soya bean region of Argentina. Ninety‐three isolates from plants and soil were evaluated in the present study. The pathotype for each isolate was determined using the hypocotyl technique on a set of eight differentials. For neutral genetic diversity evaluation, eight SSRs markers were utilized. Thirty pathotypes were determined, including 19 in SPS and 23 in NPS. The number of isolates for each locality and region was unevenly distributed. Pathotype variation was high for P. sojae samples compared among fields and within isolates from single fields. SSR variation studies resulted in an elevated haplotype composition, partitioned at all, but the regional levels. P. sojae populations from Argentina have evolved towards a complex epidemiological scenario, with no evidence of geographic correlation at the pathotypic nor the neutral genetic level. It is likely that future works aiming at elucidating the evolution of pathogenesis in this species will need to include non‐neutral markers, specifically associated to avr loci. The results of the present work are considered a useful contribution to the adequate and sustainable management of this pathogen in the main soya bean area of Argentina.

中文翻译：

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阿根廷潘帕斯草原大豆疫霉的病理型和 SSR 变异

在阿根廷核心大豆区的北部 (NPS) 和南部 (SPS) Pampeana 子区域之间比较了大豆疫霉的遗传变异。本研究评估了来自植物和土壤的 93 个分离株。使用下胚轴技术对一组八个差异确定每个分离株的病理型。对于中性遗传多样性评估，使用了八个 SSR 标记。确定了 30 种病理类型，包括 SPS 中的 19 种和 NPS 中的 23 种。每个地方和地区的分离株数量分布不均。与田间和单个田间分离株内相比，大豆疫霉样品的病理型变异很高。SSR 变异研究导致单倍型组成升高，完全分区，但区域级别。P。来自阿根廷的 sojae 种群已演变为复杂的流行病学情况，没有证据表明在病理学或中性遗传水平上存在地理相关性。未来旨在阐明该物种发病机制进化的工作可能需要包括非中性标记，特别是与 avr 基因座相关的标记。目前的工作结果被认为是对阿根廷主要大豆区这种病原体的充分和可持续管理的有益贡献。