Vol. 11, Issue 2 (2022)

Author(s):
Sohan Lal Kajla, AK Sharma, Hoshiyar Singh, Mukesh Bhakal and Moti Ram Natwaria

Abstract:
The present investigation was performed to analyze the effect of late season heat stress on grain yield and yield ingredient of ten bread wheat varieties and 45 F₁’s.Based on heat susceptibility index the wheat genotypes Raj 3077, Raj 1482 and Raj 3777 were highly tolerant to increased temperature as compared to other wheat genotypes. The crosses Raj 4079 x Raj 3765, Raj 3077 x PBW 550, WH 1021 x DBW 90, Raj 1482 x HD 3086 and Raj 4238 x WH 1021 which exhibited comparatively more tolerance for grain yield per plant. These were predictable for thermo tolerance in delay sown conditions. The heat susceptibility index could be taken as important criteria for breeding wheat genotypes suitable for late sown environments. These genotypes can be used in wheat breeding programs related to high temperature stress. In very late sown condition the parents Raj 3765, Raj 3077 and WH 1021 and crosses WH 1021 x PBW 550, Raj 3765 x Raj 3077 and Raj 4238 x WH 1021 emerged as good general combiner and specific cross combinations. Therefore, these genotypes may be used in the future breeding programs for development of a heat tolerant wheat variety suitable for late sown to maximize production.