Vol. 11, Issue 5 (2022)

Author(s):
Madhu Choudhary, H Singh, D Gupta, Madhu Yadav, Sonu Get and Rajwanti Saran

Abstract:
This experiment was conducted for estimated terminal heat stress in wheat cultivation that a severe threat resultant severe loss of yield. Due to heat stress, reduction in all the traits specially grain yield, thousands kernel weight and grain filling duration by 46.63, 20.61 and 20.42 per cent, respectively. High temperature adversely affects survivability of the tillers per plant, that causes decrease in grain yield of the wheat. Therefore, it is prerequisite to develop high-yielding and heat tolerant varieties. In the present study parents viz., Raj 4037, DBW 90, PBW 502 and UP 2425 and crosses viz., DPW 621-50 x Raj 4037, DPW 621-50 x Raj 4079 in F₁ and Raj 4037 x Raj 3765 and Raj 3765 x Raj 4079, DBW 90 x Raj 4037 and DPW 621-50 x Raj 4037 in F₂ were found the most desirable as they have high heat tolerant for most of the traits examined. The heat susceptibility index may be engaged as important criteria for breeding of wheat genotypes suitable for heat stress condition.