Genetical and Physiological Analysis for Heat Tolerance in Spring Wheat

Abstract

The experiment was conducted at Agronomy field laboratory, Dept. of Agronomy and Agricultural Extension, University of Rajshahi, Rajshahi during 2019-2020 to identify the diverse genotypes of wheat related to heat tolerance. Twenty wheat genotypes/lines were used as a plant materials in this experiment. The wheat genotypes/lines were evaluated in heat stress environments. Non-hierarchical clustering grouped the wheat genotypes into five clusters. The cluster II indicated the maximum number of genotypes following the cluster V, III and IV. Plant height and spikes m-2 were major traits contributed mostly towards genetic divergence. Selection of parents for these two traits has good scope to get broad spectrum of segregates. The cluster V had the highest grains spike-1, spikelet’s spike-1, 1000-grain weight, grain yield and biomass whereas canopy temperature, heading days and maturity days were lowest. Cluster I had the lowest grain yield, spikes m-2, grains spike-1, biomass and chlorophyll content, plant height, spikelet’s spike-1 and 1000-grain weight. Five pairs of clusters viz. the clusters (I and V, I and II, I and IV, III and V and IV and V) may be considered for getting more heterotic F1. The genotypes G 02 and G 11 of cluster I and genotypes G 6, G 15, G 17, G 18 and G 20 of cluster V may be considered as parents for future hybridization program to obtain diverse genotypes related to heat tolerance. J. of Sci. and Tech. Res. 3(1): 61-68, 2021