Drought and heat stress are major indicators of global climate change and yield-limiting factors in wheat. Moreover, simultaneous occurrence of both factors could increase the injuries and greater yield losses in wheat species. In this scenario, there is need to screen germplasm and develop breeding lines which may show better resistance under the targeted condition. A germplasm comprising of 17 advanced lines, 4 elite checks and 79 accessions was compared to determine their resistance under controlled osmotic (− 0.9 MPa) and heat stress (40 °C) on the basis of various seedling traits. Heat and drought resistance index showed significant positive relationship with root mass showing the importance of this trait for selection under stress condition. Germplasm accession such as NARC-11022 possessed the highest drought and heat resistance index while standard check such as FSD-08 had the highest drought resistance index. These accessions may be exploited in breeding cultivars for multiple stress condition. Some advanced lines such as SU-100, SU-159 showed promising results under both types of stress, and these lines may be recommended for stress-prone environment.

中文翻译：

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抗旱热胁迫的春小麦种质筛选

干旱和热应激是全球气候变化和小麦产量限制因素的主要指标。此外，同时发生这两种因素可能会增加小麦品种的伤害和更大的产量损失。在这种情况下，需要筛选种质并开发在目标条件下可能表现出更好抗性的育种系。比较了由 17 个先进品系、4 个优良品系和 79 个种质组成的种质，以确定它们在受控渗透 (- 0.9 MPa) 和热胁迫 (40 °C) 下的抗性，基于各种幼苗性状。耐热和耐旱指数与根质量呈显着正相关，表明该性状在胁迫条件下选择的重要性。NARC-11022等种质种质具有最高的抗旱性和耐热性指数，而标准检查如FSD-08的抗旱性指数最高。这些种质可用于培育多种胁迫条件的栽培品种。一些先进的生产线，如 SU-100、SU-159，在两种压力下都显示出有希望的结果，这些生产线可能被推荐用于易受压力的环境。