Common bean SNP alleles and candidate genes affecting photosynthesis under contrasting water regimes

Susana Trindade Leitão*, Maria Catarina Bicho, Priscila Pereira, Maria João Paulo, Marcos Malosetti, Susana de Sousa Araújo, Fred van Eeuwijk, Maria Carlota Vaz Patto

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

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 SNP-trait 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 water-deficit 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.

Original languageEnglish
Article number4
JournalHorticulture Research
Volume8
Issue number1
DOIs
Publication statusPublished - Jan 2021

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