Additive and dominance correlations between grain shape and yield of early-season Indica hybrid rice

Correlation analysis between the grain shape characteristics and yield traits of an incomplete diallel cross of the early-season Indica rice(Oryza sativa L.)was conducted based on the additive and dominance genetic model.The results showed that there were significant correlations among most of the traits,and that the additive correlations were more important than the dominance correlations.The yield traits were found most closely correlated,followed by the grain shape.Between yield and grain shape of the Indica rice,a few characteristics showed high correlation coefficients.Traits with high additive correlations were thus recommended as an indicator for indirect selection of the early-season Indica rice hybrids.