The Indian Journal of Genetics and Plant Breeding

Thirteen families (F₂ crosses) each with 5 progenies were grown in compact family block design with three replications in two environments normal sowing (E₁) and very late sowing (E₂) environments at Udaipur. Data recorded for grain yield, its twelve component traits and seven heat tolerant parameters were analysed to identify superior crosses and their progenies for yield and heat tolerance so as to exploit these for getting desirable sergeants in advanced generations. The analysis of variance revealed significant differences among the families for grain yield and all other traits in both the environments. However, the variations among the progenies within a family varied from character to character and environment to environment. In normal sowing environment, C₁₂ family was the best among the eight families depicting significantly higher grain yield than the standard check. While in E₂ late sown environment, C₁ could be considered as one of the best family for yield and other attribUtes. Of heat tolerance traits, the family C₆ proved its worthiness. Based on the per se performance and estimation of variability parameters, C₁₂P₂, C₁₁ P₅ and C₁₃P₅ were most promising progenies for normal conditions, while C₁P₃, C₁P₁, C₆P₄, C_SP₁ and C₄P₅ were promising for very late sown conditions. Selection from these families in advanced generations could provide desirable segregants for/ligh yield and heat tolerance.