Estimates of heritability for, and relationships between, root and shoot characters of white clover II. Regression of progeny on mid-parent

White clover genotypes were selected for high and low values of leaf size, taproot diameter, number of taproots, proportion of total root and taproot dry weight. Crosses within selected groups of genotypes resulted in 14 seed lines, which were compared with parent genotypes in field tiles. Selections for taproot diameter and proportion taproot were more successful than those for taproot number and proportion root. Narrow sense heritability of characters calculated by regression of progeny on mid-parent values were well correlated with broad sense heritabilities derived from replicated clonal comparisons (r = 0.73*), indicating that the genetic variation is controlled predominantly by additive gene effects.