Regression analysis of head mass and mass of useful part of head in cabbage (Brassica oleracea Var. capitata L)

The objective of this paper was to determine the genetic mode of inheritance of quantitative traits in cabbage via regression analysis in complete diallel crossing.The regression analysis of head mass traits showed that the regression line was distant from the limiting parabola, indicating nonadditive gene action in head mass inheritance. The expected line of regression intersected the Wr axis below the coordinate origin, confirming the presence of superdominance in this inheritance. As useful head part mass comprises the bulk of total head mass, the regression analysis results were similar. The regression line was also far from the limiting parabola indicating nonadditive gene action in this trait's inheritance. Similarly the regression line intersected the Wr axis below the origin, suggesting we had a case of superdominance in the inheritance of this trait as well.