Climate change is a major threat to the growth of most crops in arid and semi-arid regions. Drought stress is one of the results of climate change that has a negative impact on the growth and yield of crops. In order to investigate the morpho-physiological traits and their relationship with grain yield in barley and to determine the best criteria for selection under terminal drought stress conditions, 20 barley genotypes (Hordeum vulgare L.) were evaluated during two cropping seasons 2016–2017 and 2017–2018 under terminal drought stress conditions (irrigation cut at 50% heading) using a randomized complete block design with three replications. During the experiment, days to heading, days to maturity, number of fertile tillers, plant height, peduncle length, peduncle weight, spike length, number of grain per spike, 1000-kernel weight, remobilization, remobilization efficiency, biological yield, harvest index and grain yield were measured. Variance analysis of the studied traits showed significant difference for most traits for genotype effects. Mean comparison showed that the highest grain yield was related to genotypes 16 and 11. Correlation, regression and path analysis showed that remobilization, harvest index, biological yield and peduncle weight had the most effects on grain yield under drought stress conditions. This indicates that these traits can be used in barley breeding for grain yield improvement under terminal drought stress conditions. Three genotypes, 4, 11 16 with the highest remobilization, harvest index, biological yield and peduncle weight achieved higher grain yields under the stress conditions.

气候变化是干旱和半干旱地区大多数作物生长的主要威胁。干旱胁迫是气候变化的结果之一，对作物的生长和产量产生负面影响。为研究大麦形态生理性状及其与产量的关系，确定在终末干旱胁迫条件下的最佳选择标准，研究了 20 种大麦基因型（Hordeum vulgare L.) 在 2016-2017 年和 2017-2018 年两个种植季节在终末干旱胁迫条件下（灌溉减少 50% 抽穗）使用具有三个重复的随机完整区组设计进行了评估。试验期间，抽穗天数、成熟天数、可育分蘖数、株高、花梗长、花梗重、穗长、每穗粒数、千粒重、再活化、再活化效率、生物产量、收获指数和粮食产量进行了测量。所研究性状的方差分析显示，大多数性状的基因型效应存在显着差异。均值比较表明，最高的粮食产量与基因型 16 和 11 相关。相关性、回归和路径分析表明，再动员、收获指数、在干旱胁迫条件下，生物产量和花序梗重对粮食产量的影响最大。这表明这些性状可用于大麦育种，以提高终末干旱胁迫条件下的谷物产量。再活化、收获指数、生物产量和花序梗重3个基因型4、11、16在胁迫条件下获得了较高的粮食产量。