Identifying the genomic regions (quantitative trait loci (QTL)) significantly linked to grain yield under drought stress could expedite the development of novel rice cultivars suited for rainfed areas through marker‐assisted breeding. This study identified QTL regions linked to plant phenology and production traits by evaluating 122 recombinant inbred lines (RILs) of Danteshwari × Daggaddeshi under different environmental conditions. A consistent QTL region associated with grain yield under water stress (60.4 Mbp) was mapped on chromosome 1 between RM428 and RM24 with an LOD score of 4.0. Another QTL region (9.4 Mbp) linked to plant height under all environmental conditions was mapped on chromosome 1 between RM1‐HvSSR1‐87 with a LOD score of 7.5 and phenotypic variance of 25%. A core set of 402 diverse rice accessions was also evaluated under water stress conditions and subjected to genome‐wide association analysis. Twelve markers linked to grain yield under drought were identified, out of which five were significantly associated with grain yield and days to flowering under drought. The markers linked to grain yield were compared between the bi‐parental population and germplasm accessions to identify the common markers. Three markers (RM1, RM259 and RM201) were found to be consistently linked to drought stress across the seasons in both bi‐parental population and germplasm accessions studied and could be potential candidates for application in marker‐assisted selection for improving grain yield under drought stress in rice.

中文翻译：

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鉴定决定水稻干旱胁迫下谷物产量的基因座（Oryza sativa L.）


鉴定与干旱胁迫下谷物产量显着相关的基因组区域（数量性状位点（QTL））可以通过标记辅助育种加快适合雨养地区的新型水稻品种的开发。本研究通过评估不同环境条件下 Danteshwari × Daggaddeshi 的 122 个重组自交系 (RIL)，鉴定了与植物物候和生产性状相关的 QTL 区域。与水分胁迫下谷物产量相关的一致 QTL 区域 (60.4 Mbp) 被定位在 RM428 和 RM24 之间的 1 号染色体上，LOD 得分为 4.0。另一个在所有环境条件下与株高相关的 QTL 区域 (9.4 Mbp) 被定位在 RM1-HvSSR1-87 之间的 1 号染色体上，LOD 得分为 7.5，表型方差为 25%。还对 402 个不同水稻品种的核心组进行了水分胁迫条件下的评估，并进行了全基因组关联分析。鉴定出十二个与干旱条件下谷物产量相关的标记，其中五个与干旱条件下谷物产量和开花天数显着相关。对双亲群体和种质材料之间与谷物产量相关的标记进行比较，以确定共同标记。在所研究的双亲群体和种质材料中，发现三个标记（RM1、RM259 和 RM201）与跨季节的干旱胁迫始终相关，并且可能成为用于标记辅助选择的潜在候选者，以提高干旱胁迫下的谷物产量在米饭中。