Among abiotic stresses, drought influences plant growth and productivity, and plant stress responses depend on stress intensity and genotype. The effects of simulated drought stress on germination parameters were tested for tolerance and sensitivity in 59 barley accessions from all regions of Iraq and phenotypic, physiological, and biochemical responses associated with drought stress were investigated. Stress treatments with polyethylene glycol (PEG) reduced the germination rate and dramatically delayed the development of the seedlings. Significant changes in the physiological and biochemical profiles in barley accessions were observed. A smaller reduction in water absorption of seeds was observed across all accessions, while all biochemical characteristics except total flavonoid content were increased with the increase in water deficiency in most accessions. Among the 59 barley accessions, ABN was the most tolerant accession, while Black-Garmiyan was the most drought-prone. Significant relationships were found between most trait pairs, with 24 significant associations under no stress, 39 significant correlations under the 10.25% PEG treatment, and 60 significant correlations under the 20.50% PEG treatment. According to the key importance analysis, seed water uptake, total phenol content, soluble sugar content, and catalase are classified as relative significance traits for germination percentage, root and shoot length under stress conditions.

在非生物胁迫中，干旱会影响植物的生长和生产力，而植物的胁迫反应则取决于胁迫强度和基因型。在伊拉克所有地区的59个大麦种质中，模拟干旱胁迫对发芽参数的影响进行了耐受性和敏感性测试，并研究了与干旱胁迫相关的表型，生理和生化反应。用聚乙二醇（PEG）进行的胁迫处理降低了发芽率，并大大延迟了幼苗的发育。观察到大麦种质的生理和生化特性发生了显着变化。在所有种质中，观察到的种子吸水率的降低幅度较小，而大多数种质中除总黄酮含量外的所有生化特性均随缺水量的增加而增加。在59个大麦品种中，ABN品种最耐，而Black-Garmiyan品种最容易干旱。在大多数性状对之间发现显着关系，在无压力下有24个显着关联，在10.25％PEG处理下39个显着相关，在20.50％PEG处理下60个显着相关。根据关键重要性分析，将种子水分吸收，总酚含量，可溶性糖含量和过氧化氢酶归类为胁迫条件下发芽率，根和苗长的相对显着性状。黑加米扬（Black-Garmiyan）最容易干旱。在大多数性状对之间发现显着关系，在无压力下有24个显着关联，在10.25％PEG处理下39个显着相关，在20.50％PEG处理下60个显着相关。根据关键重要性分析，将种子水分吸收，总酚含量，可溶性糖含量和过氧化氢酶归类为胁迫条件下发芽率，根和苗长的相对显着性状。黑加米扬（Black-Garmiyan）最容易干旱。在大多数性状对之间发现显着关系，在无压力下有24个显着关联，在10.25％PEG处理下39个显着相关，在20.50％PEG处理下60个显着相关。根据关键重要性分析，将种子水分吸收，总酚含量，可溶性糖含量和过氧化氢酶归类为胁迫条件下发芽率，根和苗长的相对显着性状。