1Present address: Department of Biotechnology, Kurukshetra University, Kurukshetra136 119, Haryana
ICAR-Indian Institute of Wheat & Barley Research, Karnal132 001, Haryana
Online published on 19 May, 2022.
The objective of this study was to assess heat tolerance of spring wheat genotypes. For this purpose, a panel of 25 heat-responsive wheat genotypes was evaluated under optimum field conditions and two heat-stress conditions (HSC) viz., HSC1 and HSC2 during two crop seasons. Combined analysis of variance showed significant differences among genotypes for HSIs and grain yield. Heat stress indices (HSIs) were estimated using grain yield under optimum and stress conditions. Correlation coefficients and principal component analysis revealed the importance of mean productivity, geometric mean productivity, stress tolerance index and stress susceptibility index in selecting heat tolerant genotypes. Genotypes DBW 71, DBW 107, AKW 2862-1 and KKR 1043 were found more tolerant with good yield potential under HSC1 whereas WH730, DBW 173, DBW 71 and WR 544 performed best under HSC2 along with optimum field condition. Identified genotypes can be used in wheat improvement programs developing heat stress-tolerant genotypes.
Heat stress, Heat susceptibility index, Principal component analysis, Biplot, Correlation
