Inheritance of quantitative characters in knol khol

Abstract

Generation means analysis approach was followed to understand the inheritance of quantitative traits in knol khol (Brassica oleracea var. gongylodes L.). Two cultivars ‘White Vienna’ (P1) and ‘GKR’ (P2) used in the study had diverse phenotypic characteristics. Six generations viz., P1, P2, F1, F2, B1, and B2 were utilized to study the inheritance of frame size, knob size index, number of leaves per plant, days to 50% harvest, gross plant weight and knob weight. The additive dominance model was found adequate for number of leaves per plant and days to 50% harvest. It was revealed that more number of leaves per plant was dominant over lesser number of leaves per plant and genes responsible for earliness were dominant to their alleles for late maturity. For the other 4 characters digenic interaction model was found adequate thereby indicating that the expression of these characters was controlled by the interactions of two genes. The parameters [h] and [l] had opposite signs in case of all the 4 characters, which referred to as duplicate type of interaction but [l] was not significantly different from zero so the predominant type of interaction could not be classified. The positive estimates of [i] indicated that the two gene pairs for frame size, knob size index, gross plant weight and knob weight were present in associated form in the parents.