Heat stress is a major constraint of yield in grain legumes including peas. Increasing global warming and human population now urge to develop climate resilient varieties. The present experiment was conducted over 2 years to evaluate the heat tolerance of 211 pea genotypes. In the present study, the field pea genotypes showed a wide variation for reproductive stage heat stress (RSHS) quantitative traits. Significant positive correlations were found between no. of seeds per plant and no. of pods per plant; seed diameter (mm) and 25-seed weight (g) in heat tolerant as well as heat susceptible genotypes. Principal component analysis revealed two major principal components contributed approximately 91% of total variations and heat tolerant and susceptible genotypes separately formed two major clusters. Stepwise multiple regression analysis revealed that no. of seeds per plant was the best predictor for no. of pods per plant. On the basis of four RSHS traits, the most prominent heat tolerant pea genotypes identified in the present study JP-625, IARI-2877, PMR-38 II, EC-318760, EC-328758 and IARI-2904 would better combat RSHS and provide yield stability under changing climatic conditions.

中文翻译：

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豌豆（Pisum sativum L.）开花和结荚过程中热应激的影响。

热应力是包括豌豆在内的豆类谷物产量的主要限制因素。现在，全球气候变暖和人口增长的趋势促使人们开发具有气候适应性的品种。本实验进行了2年，以评估211种豌豆基因型的耐热性。在本研究中，豌豆基因型表现出生殖阶段热应激（RSHS）数量性状的广泛差异。发现没有之间显着正相关。每棵植物的种子数量 每株豆荚的数量；耐热和易感基因型的种子直径（毫米）和25粒重（克）。主成分分析显示，两个主要主成分贡献了约91％的总变异，耐热和易感基因型分别形成了两个主要聚类。逐步多元回归分析表明没有。每棵植物的种子数量是没有的最佳预测因子。每个植物的豆荚数量。根据四个RSHS性状，本研究中鉴定出的最突出的耐热豌豆基因型JP-625，IARI-2877，PMR-38 II，EC-318760，EC-328758和IARI-2904可以更好地抵抗RSHS并提供气候条件变化时的产量稳定。