Genetic studies in tomato for yield and its components under high temperature.

Generation mean analysis was carried out on six generations (P1, P2, F1, F2, B1 and B2) in four tomato crosses viz. Cross-I (H7997 x CLN 1621 E), Cross- II (H7997 x BL 337), Cross - III (H7997 x Nagcarlan) and Cross- IV (H997 x CLN 2366A). Observstions were recorded on eight yield attributing characters including yield. The presence of epistasis was recorded in all the four crosses. From six parameter model regression of the components of six parameter model on environmental indices it was evident that it was evident that additive effect played a decisive role in the inheritance of number of primary branches per plant, number of fruiting clusters per plant and fruit yield per plant. Dominance effect was found significant and consistent in one or more crosses for days to flowering, number of fruiting clusters per plant and fruit yield per plant. Duplicate epistasis was more predominant for most of the characters in the crosses. [ABSTRACT FROM AUTHOR]