Vol. 9, Issue 1 (2020)

Author(s):
Nitin Kumar

Abstract:
This study evaluates the stability and heat stress tolerance of 40 wheat varieties across six environments. Significant differences in genotype, environment, and their interactions were found, indicating substantial performance variation. Environments E1 and E4 excelled, while E3 and E6 underperformed. Varieties like HD 2687 and CPAN 6143 were stable for total chlorophyll, while DW 36 and HD 2189 were stable for effective tillers. UP 2338 and UP 262 showed stability for biological yield, and HD 2687 and CPAN 3074 were stable for grains per ear. All genotypes were consistent for grain weight per ear, with ten varieties showing stability. Seven genotypes, including CPAN 3074 and HD 2189, were stable for protein content. Heat stress tolerance was assessed, with UP 2338 and PBW 226 showing tolerance for biological yield under late sowing. The study highlights the complex relationship between stability and heat stress tolerance, providing insights for breeding resilient wheat varieties.