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The present investigation was conducted to determine the genetic variability, Heat Susceptibility Index (HSI) and Heat Tolerance Efficiency (HTE) in 17 wheat genotypes including the checks over timely and late sown condition of rabi 2016-17 and 2017-18. On the basis of HSI for yield per plant, K1006, CG1507, PBW343 and HUW234 while UP2847, RWP 2015-22 and CG 1507 were observed to be tolerant in in 2016-17 and 2017-18, respectively. HSI for 1000 grain weight was observed to be tolerant in genotypes K 1006, RWP 2015-22, CG 1505, Lok-1 and NW 1014 in 2016-17and in genotypes K 1006, HD 2967 and DBW 14 in 2017-18, respectively. For HTE, CG 1507 (92.8%) and NW 1014 (113%) were best in 2016-17 and 2017-18, respectively. The genetic parameters showed significant variability among the genotypes and high broad sense heritability was observed for plant height in 2016-17 and for yield per plant and plant height in 2017-18

electronic journal of plant breeding

Estimation of genetic variability, heat susceptibility index and tolerance efficiency of wheat (Triticum aestivum L.) for timely and late sown environments