title: Genome-Wide Association Studies of Anthracnose and Angular Leaf Spot Resistance in Common Bean (Phaseolus vulgaris L.).
abstract: The common bean (Phaseolus vulgaris L.) is the world's most important legume for human consumption. Anthracnose (ANT; Colletotrichum lindemuthianum) and angular leaf spot (ALS; Pseudocercospora griseola) are complex diseases that cause major yield losses in common bean. Depending on the cultivar and environmental conditions, anthracnose and angular leaf spot infections can reduce crop yield drastically. This study aimed to estimate linkage disequilibrium levels and identify quantitative resistance loci (QRL) controlling resistance to both ANT and ALS diseases of 180 accessions of common bean using genome-wide association analysis. A randomized complete block design with four replicates was performed for the ANT and ALS experiments, with four plants per genotype in each replicate. Association mapping analyses were performed for ANT and ALS using a mixed linear model approach implemented in TASSEL. A total of 17 and 11 significant statistically associations involving SSRs were detected for ANT and ALS resistance loci, respectively. Using SNPs, 21 and 17 significant statistically associations were obtained for ANT and angular ALS, respectively, providing more associations with this marker. The SSR-IAC167 and PvM95 markers, both located on chromosome Pv03, and the SNP scaffold00021_89379, were associated with both diseases. The other markers were distributed across the entire common bean genome, with chromosomes Pv03 and Pv08 showing the greatest number of loci associated with ANT resistance. The chromosome Pv04 was the most saturated one, with six markers associated with ALS resistance. The telomeric region of this chromosome showed four markers located between approximately 2.5 Mb and 4.4 Mb. Our results demonstrate the great potential of genome-wide association studies to identify QRLs related to ANT and ALS in common bean. The results indicate a quantitative and complex inheritance pattern for both diseases in common bean. Our findings will contribute to more effective screening of elite germplasm to find resistance alleles for marker-assisted selection in breeding programs.
authors.affiliation: Universidade Tecnológica Federal do Paraná (UTFPR), Dois Vizinhos, Paraná, Brasil.|Centro de Recursos Genéticos Vegetais, Instituto Agronômico de Campinas (IAC), Campinas, São Paulo, Brazil.
authors.forename: Juliana Morini Küpper Cardoso
authors.initials: JM
authors.lastname: Perseguini
authors.affiliation: Laboratório Nacional de Biociências (LNBio), Campinas, São Paulo, Brazil.
authors.forename: Paula Rodrigues
authors.initials: PR
authors.lastname: Oblessuc
authors.affiliation: Departamento de Genética, Escola Superior de Agricultura Luiz de Queiroz/Universidade de São Paulo (ESALQ/USP), Piracicaba, São Paulo, Brazil.
authors.forename: João Ricardo Bachega Feijó
authors.initials: JR
authors.lastname: Rosa
authors.affiliation: Centro de Recursos Genéticos Vegetais, Instituto Agronômico de Campinas (IAC), Campinas, São Paulo, Brazil.
authors.forename: Kleber Alves
authors.initials: KA
authors.lastname: Gomes
authors.affiliation: Centro de Grãos e Fibras, Instituto Agronômico de Campinas (IAC), Campinas, São Paulo, Brazil.
authors.forename: Alisson Fernando
authors.initials: AF
authors.lastname: Chiorato
authors.affiliation: Centro de Grãos e Fibras, Instituto Agronômico de Campinas (IAC), Campinas, São Paulo, Brazil.
authors.forename: Sérgio Augusto Morais
authors.initials: SA
authors.lastname: Carbonell
authors.affiliation: Departamento de Genética, Escola Superior de Agricultura Luiz de Queiroz/Universidade de São Paulo (ESALQ/USP), Piracicaba, São Paulo, Brazil.
authors.forename: Antonio Augusto Franco
authors.initials: AA
authors.lastname: Garcia
authors.affiliation: Empresa Brasileira de Pesquisa Agropecuária, Centro Nacional de Pesquisa de Arroz e Feijão, Goiania, Goiás, Brazil.
authors.forename: Rosana Pereira
authors.initials: RP
authors.lastname: Vianello
authors.affiliation: Centro de Recursos Genéticos Vegetais, Instituto Agronômico de Campinas (IAC), Campinas, São Paulo, Brazil.
authors.forename: Luciana Lasry
authors.initials: LL
authors.lastname: Benchimol-Reis
mesh_terms: D001203:Ascomycota / Q000502:physiology; D002874:Chromosome Mapping; D032461:Chromosomes, Plant / Q000235:genetics; D020231:Colletotrichum / Q000502:physiology; D060467:Disease Resistance / Q000235:genetics*; D005787:Gene Frequency; D017343:Genes, Plant / Q000235:genetics; D005819:Genetic Markers / Q000235:genetics; D018745:Genome, Plant / Q000235:genetics*; D005838:Genotype; D054884:Host-Pathogen Interactions; D040582:Inheritance Patterns / Q000235:genetics; D015810:Linkage Disequilibrium; D018895:Microsatellite Repeats / Q000235:genetics; D027805:Phaseolus / Q000235:genetics* / Q000382:microbiology; D010935:Plant Diseases / Q000235:genetics* / Q000382:microbiology; D020641:Polymorphism, Single Nucleotide; D040641:Quantitative Trait Loci / Q000235:genetics
chemical_list: D005819:Genetic Markers