Effect of WA cytoplasm on yield and yield attributes of rice hybrids

Twenty pairs of AF1 (CMS line x restorer) and BF1 (maintainer line x restorer) cross combinations were evaluated to assess the WA cytoplasmic influence on yield and yield traits of rice hybrids. The cytoplasmic influence for different traits was found to be cross-specific, depending on the nuclear background of CMS line and fertility restorer. Most of the traits were not significantly affected by the sterile cytoplasm in majority of the cross combinations. Only in some crosses, the cytoplasm has significant influence for the traits days to 50 per cent flowering, days to maturity, 100 grain weight and yield per plant. Male sterility inducing cytoplasm has no significant effect on plant height and effective tillers per plant.