Genome-wide association reveals novel genomic loci controlling rice grain yield and its component traits under water-deficit stress during the reproductive stage

Kadam Niteen N., Struik Paul C., Rebolledo Maria Camila, Yin Xinyou, Jagadish Krishna S.V.. 2018. Genome-wide association reveals novel genomic loci controlling rice grain yield and its component traits under water-deficit stress during the reproductive stage. Journal of Experimental Botany, 69 (16) : 4017-4032.

Quartile : Q1, Sujet : PLANT SCIENCES

Résumé : A diversity panel comprising of 296 indica rice genotypes was phenotyped under non-stress and water-deficit stress conditions during the reproductive stage in the 2013 and 2014 dry seasons (DSs) at IRRI, Philippines. We investigated the genotypic variability for grain yield, yield components, and related traits, and conducted genome-wide association studies (GWAS) using high-density 45K single nucleotide polymorphisms. We detected 38 loci in 2013 and 64 loci in 2014 for non-stress conditions and 69 loci in 2013 and 55 loci in 2014 for water-deficit stress. Desynchronized flowering time confounded grain yield and its components under water-deficit stress in the 2013 experiment. Statistically corrected grain yield and yield component values using days to flowering helped to detect 31 additional genetic loci for grain yield, its components, and the harvest index in 2013. There were few overlaps in the detected loci between years and treatments, and when compared with previous studies using the same panel, indicating the complexity of yield formation under stress. Nevertheless, our analyses provided important insights into the potential links between grain yield with seed set and assimilate partitioning. Our findings demonstrate the complex genetic architecture of yield formation and we propose exploring the genetic basis of less complex component traits as an alternative route for further yield enhancement.

Mots-clés Agrovoc : Oryza sativa, génotype, stress dû à la sécheresse, locus, floraison, rendement des cultures, stade de développement végétal

Mots-clés géographiques Agrovoc : Philippines

Mots-clés complémentaires : Oryza sativa indica

Classification Agris : F30 - Génétique et amélioration des plantes
F63 - Physiologie végétale - Reproduction

Champ stratégique Cirad : Axe 1 (2014-2018) - Agriculture écologiquement intensive

Auteurs et affiliations

• Kadam Niteen N., IRRI [International Rice Research Institute] (PHL)
• Struik Paul C., Wageningen Agricultural University (NLD)
• Rebolledo Maria Camila, CIRAD-BIOS-UMR AGAP (FRA)
• Yin Xinyou, Wageningen University and Research Centre (NLD) - auteur correspondant
• Jagadish Krishna S.V., IRRI [International Rice Research Institute] (PHL) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/589135/)

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