Mapping QTLs for drought tolerance in a SEA 5 x AND 277 common bean cross with SSRs and SNP markers

• Processo: 17/17891-6
• Modalidade de apoio: Auxílio à Pesquisa - Publicações científicas - Artigo
• Data de Início da vigência: 01 de novembro de 2017
• Data de Término da vigência: 30 de abril de 2018
• Área do conhecimento: Ciências Agrárias - Agronomia - Fitotecnia
• Pesquisador responsável: Luciana Lasry Benchimol-Reis
• Beneficiário: Luciana Lasry Benchimol-Reis
• Instituição Sede: Instituto Agronômico (IAC). Agência Paulista de Tecnologia dos Agronegócios (APTA). Secretaria de Agricultura e Abastecimento (São Paulo - Estado). Campinas , SP, Brasil
• Assunto(s): Marcador molecular
• Palavra(s)-Chave do Pesquisador: abiotic stress | Inter gene-pool population | QTL mapping | Water deficit | Marcadores Moleculares

Resumo

Common bean exhibits high sensitivity to drought and low productivity. Breeding for drought resistance attempts to draw upon genes of different genetic groups. With the goal of better characterizing the factors that determine the magnitude of drought response in common beans, SEA 5 x AND 277 cross was used for mapping quantitative trait loci associated to drought tolerance. A total of 438 polymorphic markers were used to genotype the F8 mapping population. Phenotyping was performed in two greenhouses, one for adaptation to drought and the other used for irrigated conditions. Fourteen traits associated with drought tolerance were measured to identify the QTLs. The map was constructed with 331 markers, covering all the 11 chromosomes, for a total length of 1515 cM. A total of 22 QTLs was discovered for chlorophyll, leaf and stem fresh biomass, leaf biomass dry weight, leaf temperature, number of pods per plant, number of seeds per plant, seed weight, days to flowering, dry pod weight and total yield under well-watered and stress conditions. All the QTLs detected under drought conditions presented positive effects from the SEA 5 allele. This study is important for a better understanding of the genetic inheritance of drought tolerance in common bean. (AU)