Genetic diversity of Pseudocercospora griseola resistance loci in common beans
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ORIGINAL ARTICLE
Genetic diversity of Pseudocercospora griseola resistance loci in common beans Caléo Panhoca de Almeida 1 & Natalia Arruda 1 & Jean Fausto de Carvalho Paulino 1 & Gabriel Mamédio de Freitas 2 & Gabriel Francesco Janini Bonfante 1 & Miklos Maximiliano Bajay 3 & Bianca Cristina de Deus 4 & Flávia Rodrigues Alves Patrício 4 & Sérgio Augusto Morais Carbonell 5 & Alisson Fernando Chiorato 5 & Luciana Lasry Benchimol-Reis 1 Received: 5 March 2020 / Accepted: 30 July 2020 # Sociedade Brasileira de Fitopatologia 2020
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. Keywords Phaseolus vulgaris L. . Pseudocercospora griseola . Population structure
Introduction The common bean (Phaseolus vulgaris L.) is an important source of protein, natural fiber, and calories that, together with Electronic supplementary material The online version of this article (https://doi.org/10.1007/s40858-020-00395-0) contains supplementary material, which is available to authorized users. * Caléo Panhoca de Almeida [email protected] 1
Centro de Recursos Genéticos Vegetais, Instituto Agronômico de Campinas, Campinas, SP 13012-970, Brazil
2
Escola de Agronomia, Programa de Pós-Graduação em Genética e Melhoramento de Plantas, Universidade Federal de Goiás, Goiânia, GO, Brazil
3
Centro de Educação Superior da Região Sul, Universidade do Estado de Santa Catarina, Laguna, SC 88790-000, Brazil
4
Centro Avançado de Pesquisa em Proteção de Plantas e Saúde Animal, Instituto Biológico, Campinas, SP 13101-680, Brazil
5
Centro de Grãos e Fibras, Instituto Agronômico de Campinas, Campinas, SP 13012-970, Brazil
rice, constitutes a staple food with nutritional and economic importance for the Brazilian population (Broughton et al. 2003; Hefni et al. 2010; Bellucci et al. 2014). Brazil is the largest consumer and the third largest producer with estimated production of about 2360 thousand tons (CONAB 2019). Brazil may be considered a secondary center of common bean diversification (Valentini et al. 2018). However, the major constraint to bean production is
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