This study was conducted at Kom-Mombo Agricultural Research Station, Aswan governorate, ARC, Egypt to study the performance and stability analysis of some wheat genotypes under heat stress. Twelve genotypes of bread wheat were investigated under six environments; two years (2017/2018 and 2018/2019 seasons) and three sowing dates (normal (D1), 23 rd of Nov., late (D2), 13 th of Dec. and very late (D3), 16 th of January). The differences among years, dates and genotypes were significant (p˂0.01)

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... or heading date, plant height, 100-grain weight and grain yield. All first order interactions were significant for most studied traits. Mean squares due to interaction between genotypes, sowing dates and years were significantly for heading date and grain yield. The early sowing outyielded late and vey late one by 17.79 and 63.50%, respectively. Delaying sowing date reduced all traits under investigated. Five genotypes were less susceptible (heat susceptibility index less than one) and less sensitive (less than one) for heat stress. The stability analysis for grain yield exhibited that the intermediate yielding genotypes(Masr 1, Masr 2, Sids 12, Sids 13, Sids 14, BAG#1 and KACHU*2) were stable and ranged in yield from 8.90 to 12.28Ard/fed.). However, the genotype Masr 1was stable and high in grain yield. While, the highest yielding genotype; Gimmiza 11 was unstable.