Genetic Loci Governing Grain Yield and Root Development under Variable Rice Cultivation Conditions

Frontiers in Plant Science
Margaret CatolosArvind Kumar

Abstract

Drought is the major abiotic stress to rice grain yield under unpredictable changing climatic scenarios. The widely grown, high yielding but drought susceptible rice varieties need to be improved by unraveling the genomic regions controlling traits enhancing drought tolerance. The present study was conducted with the aim to identify quantitative trait loci (QTLs) for grain yield and root development traits under irrigated non-stress and reproductive-stage drought stress in both lowland and upland situations. A mapping population consisting of 480 lines derived from a cross between Dular (drought-tolerant) and IR64-21 (drought susceptible) was used. QTL analysis revealed three major consistent-effect QTLs for grain yield (qDTY1.1, qDTY1.3 , and qDTY8.1 ) under non-stress and reproductive-stage drought stress conditions, and 2 QTLs for root traits (qRT9.1 for root-growth angle and qRT5.1 for multiple root traits, i.e., seedling-stage root length, root dry weight and crown root number). The genetic locus qDTY1.1 was identified as hotspot for grain yield and yield-related agronomic and root traits. The study identified significant positive correlations among numbers of crown roots and mesocotyl length at the seedling stage and root...Continue Reading

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Citations

Feb 23, 2018·Journal of Experimental Botany·Jonathan P Lynch
Jul 3, 2021·International Journal of Molecular Sciences·Siddharth PandaJauhar Ali
Oct 9, 2021·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Parisa DaryaniZahra-Sadat Shobbar

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Methods Mentioned

BETA
MDS
PCA
PCR
genotyping
electrophoresis

Software Mentioned

QTL Network
PBtools
MDS
WinRHIZO
STAR
R
QTL cartographer
Windows QTL Cartographer

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