Association Mapping of Yield and Yield-related Traits Under Reproductive Stage Drought Stress in Rice (Oryza sativa L.)

Rice
B P Mallikarjuna SwamyArvind Kumar

Abstract

The identification and introgression of major-effect QTLs for grain yield under drought are some of the best and well-proven approaches for improving the drought tolerance of rice varieties. In the present study, we characterized Malaysian rice germplasm for yield and yield-related traits and identified significant trait marker associations by structured association mapping. The drought screening was successful in screening germplasm with a yield reduction of up to 60% and heritability for grain yield under drought was up to 78%. There was a wider phenotypic and molecular diversity within the panel, indicating the suitability of the population for quantitative trait loci (QTL) mapping. Structure analyses clearly grouped the accessions into three subgroups with admixtures. Linkage disequilibrium (LD) analysis revealed that LD decreased with an increase in distance between marker pairs and the LD decay varied from 5-20 cM. The Mixed Linear model-based structured association mapping identified 80 marker trait associations (MTA) for grain yield (GY), plant height (PH) and days to flowering (DTF). Seven MTA were identified for GY under drought stress, four of these MTA were consistently identified in at least two of the three analys...Continue Reading

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Citations

Jan 11, 2019·Genes·Gwen Iris Descalsota-EmpleoB P Mallikarjuna Swamy
Jan 1, 2017·Euphytica; Netherlands journal of plant breeding·Yunlong PangZhikang Li
Jul 16, 2020·BMC Genetics·Saumya Ranjan BarikSharat Kumar Pradhan
Apr 10, 2019·Molecular Genetics and Genomics : MGG·S K PradhanJ N Reddy
Apr 27, 2018·International Journal of Environmental Research and Public Health·Jinmeng ZhangJiaxin Jin
Jan 14, 2020·Plant Science : an International Journal of Experimental Plant Biology·Maider AstorkiaEnrique Ritter
Sep 14, 2021·Frontiers in Plant Science·Rahele PanahabadiNaser Farrokhi

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Methods Mentioned

BETA
genotyping
PCR
electrophoresis

Software Mentioned

STAR
MapMan
QTARO
PB Tools
PowerMarker
BLAT
TASSEL2
STRUCTURE

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