Studies on genetic variability, association and path coefficient analysis in F2 derivatives of CR 1009 × WP 22-2 for earliness and semi-dwarfism in rice (Oryza sativa L.)

Abstract

The present investigation was conducted in the F2 population of CR 1009 × WP 22-2 for earliness and semi-dwarfism. The yield contributing traits viz., plant height, days to fifty per cent flowering, number of productive tillers, panicle length, number of grains per panicle, thousand grain weight, grain length, grain breadth, length breadth ratio were interpreted based on their exposition of genetic variability, heritability and genetic advance besides correlation and path coefficient analysis. Negligible values of difference between PCV and GCV were recorded for plant height, number of grains per panicle, grain length and grain breadth suggesting lower environmental influence on the expression of these traits. The results of correlation and path analysis indicated that the number of productive tillers shows significantly positive and highest correlation with single plant yield pursuing selection of this trait is rewarding for grain yield improvement.

Keywords

• F2 population
• earliness and semi-dwarfism
• genetic variability
• association and path coefficient analysis