Common bean (Phaseolus vulgaris L.) is one of the most widely grown legumes in the world. Although the crop has high yield potential, average yields in Brazil are low due to several diseases. Angular leaf spot (ALS), caused by Pseudocercospora griseola, is among the most important diseases. A set of 81 accessions from the Instituto Agronomico (IAC, Campinas, SP) germplasm bank were evaluated for ALS resistance and genotyped by 12 microsatellites previously associated with ALS QTL resistance. Allele frequencies, number of alleles per locus, expected heterozygosity (He), and Shannon’s Information Index (I) were calculated. The average Ho was 0.12, and the He was 0.54. The STRUCTURE analysis and UPGMA clustering based on Nei’s genetic distance indicated a moderate degree of genetic diversity, with 4 and 5 main groups, respectively. Evaluation of the severity of ALS showed that 17% of the accessions had resistance. Cultivars were recommended for breeding crosses aimed at gaining in genetic diversity and resistance to ALS.

中文翻译：

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普通豆类灰尾蚴抗性位点遗传多样性

普通豆 (Phaseolus vulgaris L.) 是世界上种植最广泛的豆类之一。尽管该作物具有高产量潜力，但由于多种疾病，巴西的平均产量较低。由灰色 Pseudocercospora griseola 引起的角状叶斑病 (ALS) 是最重要的疾病之一。对来自 Instituto Agronomico (IAC, Campinas, SP) 种质库的一组 81 种材料进行了 ALS 抗性评估，并通过 12 颗以前与 ALS QTL 抗性相关的微卫星进行基因分型。计算等位基因频率、每个基因座的等位基因数、预期杂合性 (He) 和香农信息指数 (I)。平均 Ho 为 0.12，He 为 0.54。基于Nei's遗传距离的STRUCTURE分析和UPGMA聚类表明遗传多样性中等，分别有4个和5个主要群体。对 ALS 严重程度的评估表明，17% 的种质具有抗性。推荐品种进行杂交育种，旨在获得遗传多样性和对 ALS 的抗性。