Drought is an important factor limiting crop yield and food insecurity globally. Sixty- percent of the bean production areas are prone to drought and subsequently result in eighty-percent of yield reduction. It is emerging as a rising threat to farming communities in Bhutan. Limited studies on crop drought tolerance done in Bhutan. Six bean genotypes (Orey serbu, Orey regtang, Orey brokchilu, Yadhipa orey, Kerongree orey, Brokopali) chose to ascertain drought tolerance. The study was a factorial experiment with Completely Randomized Design (CRD) with six treatments and three replications. Genotypes were subjected to drought stress after 50% flowering till the start of pod formation. The drought condition induced for ten days during the pod formation and the irrigation resumed till harvesting. Means of water-stressed genotypes compared to their corresponding non- stressed with an All-pairwise comparison using the Bonferroni test at the significant level p<.05. The growth (leaf area, relative water content, root length, shoot weight, maturity) and yield parameters (the number of pods, pod length, the number of seeds number per pod, seed weight) determined during the time of harvest. There were significant differences (p<.05) in all the parameters measured under stress and non-stress conditions. Water-stress decreases plant growth and development of all the bean genotypes. With regards to drought susceptibility index (DSI), Orey serbu(1), Orey regtang(1), Yadhipa orey(1), and Kerongree orey(1) had the lowest DSI value. The lesser the susceptible indices, the greater is the tolerance level to the drought and vice versa.

中文翻译：

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筛选豆类（Phaseolus vulgaris L.）基因型的耐旱性

干旱是限制全球作物产量和粮食不安全的重要因素。百分之六十的豆类产区容易干旱，因此导致单产减少百分之八十。它正在成为对不丹农业社区的日益严重的威胁。在不丹进行的作物抗旱性研究有限。选择了六种豆类基因型（Orey serbu，Orey regtang，Orey brokchilu，Yadhipa orey，Kerongree orey，Brokopali）确定耐旱性。这项研究是采用完全随机设计（CRD）进行的析因实验，具有六种治疗方法和三项重复。基因型在50％开花后直到豆荚形成开始时都遭受干旱胁迫。在豆荚形成过程中，干旱条件持续了十天，灌溉恢复到收成。使用Bonferroni检验以显着水平p <.05进行全配对比较，将水分胁迫基因型的平均值与相应的非胁迫基因型进行比较。在收获期间确定生长量（叶面积，相对含水量，根长，苗重，成熟度）和产量参数（豆荚数，豆荚长度，每个豆荚的种子数，种子重量）。在压力和非压力条件下测得的所有参数均存在显着差异（p <.05）。水分胁迫降低了所有基因型豆的植物生长和发育。关于干旱敏感性指数（DSI），Orey serbu（1），Orey regtang（1），Yadhipa矿石（1）和Kerongree矿石（1）的DSI值最低。敏感指数越小，对干旱的耐受水平就越大，反之亦然。