Genome-wide association reveals novel genomic loci controlling rice grain yield and its component traits under water-deficit stress during the reproductive stage
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.
Auteurs principaux: | Kadam, Niteen N., Struik, Paul C., Rebolledo, María Camila, Yin, Xinyou, Jagadish, Krishna S.V. |
---|---|
Format: | Journal Article biblioteca |
Langue: | English |
Publié: |
Oxford University Press
2018-07-18
|
Sujets: | oryza sativa l., yield, drought stress, estrés de sequia, rice, |
Accès en ligne: | https://hdl.handle.net/10568/97142 https://doi.org/10.1093/jxb/ery186 |
Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
Documents similaires
-
Expression of the Aeluropus littoralis AlSAP Gene Enhances Rice Yield under Field Drought at the Reproductive Stage
par: Ghneim-Herrera, Thaura, et autres
Publié: (2017) -
Establishment of drought screening protocols for rice under field conditions = Protocolo para la selección de genotipos de arroz tolerantes a déficit hídrico en campo
par: Sakai, T., et autres
Publié: (2010) -
Breeding implications of drought stress under future climate for upland rice in Brazil
par: Ramírez Villegas, Julián, et autres
Publié: (2018-05) -
Overexpression of an Arabidopsis thaliana galactinol synthase gene improves drought tolerance in transgenic rice and increased grain yield in the field
par: Selvaraj, Michael Gomez, et autres
Publié: (2017-11) -
Phenotypic evaluation of DREB transgenic rice under water limited conditions
par: Sakai, T., et autres
Publié: (2007)