Genetic variability studies for yield and yield-related traits in F2 populations based on UASD Bt Cotton Event No.78

Abstract

Genetic variability for seed cotton yield and itscomponents were studied in three segregating F2 populations of cotton (Gossypium hirsutumL.). Significant variation was recorded for major traits in all the three F2 populations. Traits such as plant height (20 cm to 143 cm), bolls plant per plant (1 to 30), boll weight (2.0 g to 6.8 g) and seed cotton yield per plant (1.8 g to 115 g) exhibited wide range.High PCV and GCV estimates were recorded for all the traits under study except days to 50 per cent flowering and days to boll opening. High broad sense heritability and genetic advance over mean was observedin case of major yield attributing traits. Mid parent heterosis and inbreeding depression was significant for seed cotton yield per plant in the three F2 populations. The results suggest that the variation generated in the F2populations would be useful in selecting superior genotypes.

Keywords

• variability
• bt cotton
• heterosis
• inbreeding depression and per se performance