Tropical Plant Pathology (2021) 46, 129-138

Caléo Panhoca de Almeida, Natalia Arruda, Jean Fausto de Carvalho Paulino, Gabriel Mamédio de Freitas, Gabriel Francesco Janini Bonfante, Miklos Maximiliano Bajay, Bianca Cristina de Deus, Flávia Rodrigues Alves Patrício, Sérgio Augusto Morais Carbonell, Alisson Fernando Chiorato and Luciana Lasry Benchimol-Reis (2021)
Genetic diversity of Pseudocercospora griseola resistance loci in common beans
Tropical Plant Pathology 46 (1), 129-138
Abstract: 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 Agronômico (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.
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Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Pseudocercospora griseola	Beans (Phaseolus)	Brazil (south)