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Heat stress has adverse impacts on many physiological and morphological traits in crops. An experiment was conducted to evaluate the effects of heat stress on 100 advanced recombinant inbred lines (RILs) of wheat developed through WH1021×WH711 cross. The experiment was laid out in randomized block design at Wheat Research Area, Department of Genetics and Plant Breeding, CCSHAU, Hisar (Haryana), India during 2015-16 and 2016-17 growing season. To create heat stress at reproductive stage the sowing of crop for heat stress experiment was delayed by 4 weeks from normal period of sowing. Percent variation in mean values of yield traits showed significant effect of heat stress on yield components. Grain yield showed maximum percent variation and is also significantly correlated with grains number/spike, grains weight/spike and 100 grains weight. This percent variation in genotypes varied and less variation was observed in WH1021, which is an identified tolerant genotype, and some RILs which indicated about their tolerance to heat stress. So these RILs would form an important resource for the development of high yielding varieties under heat stress.
Keywords: Grain yield, Heat stress, Recombinant Inbred Lines, Reproductive stage, Tolerance.