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- W2098891353 abstract "A RIL population (F12 and F13 generation) developed from a cross between the two indica cultivars, Danteshwari (high yielding variety) and Dagad deshi (drought tolerant local land race). The population was phenotyped under combination of absolute rainfed (RF), terminal stage drought (TSD) and irrigated (I) conditions with direct seeding and transplanting during 2011 and 2012 to identify QTL for grain yield. Genotyping of all 122 RIL lines were done using 162 polymorphic SSR and HvSSR markers. The phenotypic and genotypic data was analyzed using QTL cartographer 2.5 and QTL IciMapping 3.2. The recombinant inbred lines exhibited significant interaction with conditions. In general, the lines performing better under stress were poor under non-stress condition; however, two lines (#17 and 57) performed well under all sets of conditions. These lines had high tillering, 10 and 27 and spikelet fertility, 80 and 95% under stress and non-stress conditions, respectively. A total of 20 QTL were detected for grain yield under different conditions by employing QTL cartographer 2.5 and 7 QTL by employing QTL IciMapping 3.2; out of which 5 QTL were common under both the software. Among the major QTL, QTL on chromosome 1 (qDTY1.1) under rainfed transplanted condition between RM 3825 (143.7cM) to RM 302 (147.8cM) had LOD score of 5.09, QTL on chromosome 3 (qDTY3.3) under irrigated transplanted condition between RM 7 (64.0cM) to RM 232 (76.7cM) had LOD score of 6.59 and QTL on chromosome 11 (qDTY11.1) under TSD transplanted condition between RM 21 (85.7cM) to RM 26334 (90.0cM) had LOD score of 7.39. This study has resulted in identification of new major QTL, one on chromosome 11 (qDTY11.1) under TSD condition, which is different than most of other QTL reported by earlier workers. These QTL except qDTY 3.3, had positive additive effects, indicating that alleles at these loci increase grain yield under different conditions and come from tolerant parent Dagad deshi. Two regions of chromosome #1 and 3 had QTL for grain yield under stress as well as non-stress conditions. These genomic regions associated with grain yield under different conditions will be useful in marker assisted breeding for drought tolerance in rice." @default.
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- W2098891353 date "2014-06-01" @default.
- W2098891353 modified "2023-09-24" @default.
- W2098891353 title "QTL for grain yield under water stress and non-stress conditions over years in rice ('Oryza sativa' L.)" @default.
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