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Evaluation of yield components and heat susceptibility of Pakistani wheat (Triticum aestivum L.) germplasm subjected to induced terminal heat stress
Abstract
A set of 205 Pakistani wheat genotypes was evaluated to access the endogenous potential for heat tolerance and agro-morphological genetic diversity in wheat population subjected to induced terminal heat stress. About 10 out of 21 agro-morphological traits, showed higher coefficient of variation (CV%) in comparison to control, which was directly associated with extent of variability in subjected population. Various traits showed a strong positive correlation in case of treatment and control. First two axes of bi-plot, F1 and F2 of principal component, PC1 as well as PC2 explained 17% and 12% for year 2017-18, 16% and 15% for year 2018-19, as well as 14% and 12% variability under control conditions respectively. Total of 8 genotypes showed heat susceptibility index (HSI≤ 0.5), hence designated as highly heat tolerant (HHT) genotypes. These genotypes also showed ≤ 20% cumulative reduction in 1000-kernel weight in comparison to control. On the bases of green leaf retention (GLR) scale, population was classified into 4 categories i.e., 11, 11% resistant (R), 48, 41% moderately resistant (MR), 22, 41% moderately susceptible (MS) and 19, 7% susceptible (S) during year 2017-18 and 2018-19 respectively. This data will be used to perform genome wide association studies (GWAS) to identify QTLs associated with heat stress tolerance
