Gene Action of Horticultural Characters in Self-Incompatible Lines of Cabbage

Estimates of Dand Hi revealed that manifestation of head weight and head diameter is governed by nonadditive genetic components. Both the additive and nonadditive genetic components are involved in the expression of head length, core length, stem length and plant height. Overdominance was recorded for head weight, length and diameter, and core length; and dominance for stem length and plant height. Recessive alleles were more frequent than positive alleles in the parents in stem length and plant height. For remaining characters the reverse was true. The studies also revealed that more than one genes controlling head weight, length and diameter exhibited dominance. Summing up the results, heterosis breeding has been recommended for head weight, length and diameter while conventional selection procedure would bring desirable improvement in stem length and plant height.