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Common bean SNP alleles and candidate genes affecting photosynthesis under contrasting water regimes
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Orientador(es)
Resumo(s)
Water deficit is a major worldwide constraint to common bean (Phaseolus vulgaris L.) production, being
photosynthesis one of the most affected physiological processes. To gain insights into the genetic basis of the
photosynthetic response of common bean under water-limited conditions, a collection of 158 Portuguese accessions
was grown under both well-watered and water-deficit regimes. Leaf gas-exchange parameters were measured and
photosynthetic pigments quantified. The same collection was genotyped using SNP arrays, and SNP-trait associations
tested considering a linear mixed model accounting for the genetic relatedness among accessions. A total of 133 SNPtrait
associations were identified for net CO2 assimilation rate, transpiration rate, stomatal conductance, and
chlorophylls a and b, carotenes, and xanthophyll contents. Ninety of these associations were detected under waterdeficit
and 43 under well-watered conditions, with only two associations common to both treatments. Identified
candidate genes revealed that stomatal regulation, protein translocation across membranes, redox mechanisms,
hormone, and osmotic stress signaling were the most relevant processes involved in common bean response to
water-limited conditions. These candidates are now preferential targets for common bean water-deficit-tolerance
breeding. Additionally, new sources of water-deficit tolerance of Andean, Mesoamerican, and admixed origin were
detected as accessions valuable for breeding, and not yet explored
Descrição
Palavras-chave
Phaseolus vulgaris photosynthesis water deficit
Contexto Educativo
Citação
Leitão et al. Horticulture Research ( 2021) 8:4
Editora
Nature