Rice production is severely threatened by drought stress in Eastern India. To develop drought tolerant varieties, selection of donors for breeding programme is crucial. Twenty one selected rice genotypes including both tolerant and sensitive to drought were grown under well-watered and drought stress conditions in dry seasons of two successive years of 2017 and 2018. Leaf water potential, relative water content displayed significant difference among the genotypes during vegetative screening. At reproductive stage drought screening, days to 50% flowering was delayed in all genotypes except N22 and Anjali (showed early flowering) however grain yield and other yield related traits decreased significantly compared to well watered condition. Correlation analysis of phenological and yield related traits with grain yield revealed that tiller numbers and panicle numbers are highly correlated with grain yield both under well-watered and water stress conditions and contributes maximum towards grain yield. The dendrogram grouped Mahamaya, Sahabhagidhan, Poornima, IBD 1, Hazaridhan, Samleshwari and Danteshwari into one cluster which performed better under water stress conditions and had grain yield more than 1.69 tha-1. Sahabhagidhan, Poornima, Vandana, and N22 displayed tolerance to drought both under vegetative and reproductive conditions which could be a good selection for the breeders to develop drought tolerant rice cultivars for eastern region of India.

中文翻译：

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物候，生理和产量标记物是鉴定印度东部耐旱水稻基因型的有效工具

印度东部干旱压力严重威胁稻米生产。为了开发耐旱品种，选择供体进行育种计划至关重要。在2017年和2018年连续两年的干旱季节，在丰水和干旱胁迫条件下种植了21种耐旱和对干旱敏感的水稻基因型。在营养筛选期间，叶水势，相对含水量在这些基因型之间表现出显着差异。在生殖期干旱筛选中，除N22和Anjali外，所有基因型的开花期都推迟到50％的天（显示早开花期），但是与水分充足的条件相比，谷物产量和其他与产量相关的性状显着下降。物候性状和与产量相关的性状与籽粒产量的相关性分析表明，在水分充足和水分胁迫的条件下，分numbers数和穗数与籽粒产量高度相关，并且对籽粒产量贡献最大。树状图将Mahamaya，Sahabhagidhan，Poornima，IBD 1，Hazaridhan，Samleshwari和Danteshwari分为一个簇，该簇在水分胁迫条件下表现更好，且谷物产量超过1.69 tha-1。Sahabhagidhan，Poornima，Vandana和N22在营养和生殖条件下均表现出对干旱的耐受性，这可能是育种者为印度东部地区开发耐旱水稻品种的良好选择。