%O We thank the Asian Development Bank and Government of Finland for their financial support for this study
through the project “TA8441-Development and dissemination of climate-resilient rice varieties for water-short
areas of South Asia and Southeast Asia”.
%K rice, genetic basis, genomics, genetics, QTLs
%A N Sandhu
%A S R Subedi
%A V K Singh
%A P Sinha
%A S Kumar
%A S P Singh
%A S K Ghimire
%A M Pandey
%A R B Yadaw
%A R K Varshney
%A A Kumar
%I Springer Nature Publishing
%V 9 (1)
%L icrisat11255
%J Scientific Reports (TSI)
%N 9334
%P 1-16
%R 10.1038/s41598-019-45770-3
%D 2019
%X In the face of global water scarcity, a successful transition of rice cultivation from puddled to dry direct-seeded rice (DDSR) is a future need. A genome-wide association study was performed on a complex mapping population for 39 traits: 9 seedling-establishment traits, 14 root and nutrient-uptake traits, 5 plant morphological traits, 4 lodging resistance traits, and 7 yield and yield-contributing traits. A total of 10 significant marker-trait associations (MTAs) were found along with 25 QTLs associated with 25 traits. The percent phenotypic variance explained by SNPs ranged from 8% to 84%. Grain yield was found to be significantly and positively correlated with seedling-establishment traits, root morphological traits, nutrient uptake-related traits, and grain yield-contributing traits. The genomic colocation of different root morphological traits, nutrient uptake-related traits, and grain-yield-contributing traits further supports the role of root morphological traits in improving nutrient uptake and grain yield under DDSR. The QTLs/candidate genes underlying the significant MTAs were identified. The identified promising progenies carrying these QTLs may serve as potential donors to be exploited in genomics-assisted breeding programs for improving grain yield and adaptability under DDSR.
%T Deciphering the genetic basis of root morphology, nutrient uptake, yield, and yield-related traits in rice under dry direct-seeded cultivation systems