Association between physico-morphological traits and drought resistance in rice: a QTL [quantitative trait loci] analysis
2001
Babu, R.C. (Tamil Nadu Agricultural Univ., Coimbatore 641 003 (India). Centre for Plant Molecular Biology) Nguyen, B.D. | Chamarerk, V. | ShanmugasundaraM, P. | Chezhian, P. | Ganesh, S.K. | Sadasivam, S. | Sarkarung, S. | Wade, L. | Nguyen, H.T.
The authors mapped QTLs [quantitative trait loci] linked to plant water relations, phenology and production traits under drought stress by subjecting 154 doubled-haploid (DH) lines to water stress before anthesis. The DH lines showed significant variation for plant water stress indicators, phenology, biomass, yield and yield components under stress. A total of 69 putative QTLs were identified for various plant water relation and production traits under control and stress conditions in the field, and individually explained 8.5-51.3% of the phenotypic variation. A region on chromosome 4 harbored major QTLs for plant height, biomass, grain yield and number of grains per panicle under drought stress. Majority alleles that led to a positive effect on plant water status and higher plant production under stress came from CT9993. The putative epistatic stable QTL lying between ME2-10-R41 on chromosome and interacted with the environment and produced significant contribution to the total phenotypic variation for RWC and grain yield under stress. Coincidence of QTLs show that root traits had positive impact on yield under stress. Two consistent QTLs identified in chromosome 4 and 9 for drought resistance traits also had pleiotropic effects on yield traits and should be useful for marker-assisted selection for rainfed rice improvement
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