GENE ACTION AND HETEROSIS STUDIES INVOLVING GYNOECIOUS LINES IN CUCUMBER (Cucumis sativus L.)
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Date
2010
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CSK Himachal Pradesh Krishi Vishavavidyalaya, Palampur
Abstract
Gene action and heterosis studies involving gynoecious lines in cucumber (Cucumis sativus L.)‖ was carried out at the Experimental Farms of the Department of Vegetable Science and Floriculture, CSK Himachal Pradesh Krishi Vishvavidyalaya, Palampur and Hill Agricultural Research and Extension Centre, Bajaura, Kullu during Kharif, 2009 to get information on gene action as inferred from the combining ability analysis and magnitude of heterosis for different traits viz., days to first female flower appearance, nodal position of first female flower, days taken to first picking, fruit length, fruit girth, average fruit weight, marketable fruits per vine, marketable yield per vine, harvest duration, number of primary branches, vine length, total soluble solids, incidence of fruit fly and powdery mildew, following line x tester mating design and analysis. Analysis of variance revealed significant differences for marketable yield per vine and all other component traits studied at Palampur and Bajaura. Genotypes x Environment mean squares were found to be significant for all the traits. The line x tester analysis revealed significant differences due to lines, testers and line x tester interaction at both the locations for most of the traits, when tested against error mean squares, indicating appreciable diversity in the experimental material. Estimates of general combining ability effects, necessitates inclusion of lines G-3, G-1, Plp-Gy-1 and EC-5082 and the testers K-pap, Sel-75-2-10, K-90 and KL-1 for making crosses which was corrobated by the superiority of their cross combinations. The estimates of GCA and SCA variances, additive (2A) and non-additive (2D) components of variance and per cent contribution of lines, testers and line x tester interactions pointed out that for marketable yield per vine and majority of the important component traits, non-additive gene action was in preponderance or in appreciable magnitude suggesting the exploitation of hybrid vigour in cucumber. There was wide variation in magnitude and direction of heterosis for all characters. Marketable yield per vine, marketable fruits per vine and average fruit weight were the most heterotic characters. Appreciable heterosis over better parent and standard checks was observed for almost all the traits. For marketable yield per vine 51 cross combinations at Palampur, 43 at Bajaura and 50 in pooled environment showed hybrid vigour over better parent. Over SC1 and SC2, 16 and 42, 35 and 43, 42 and 41 crosses revealed positive heterosis at Palampur, Bajaura and in pooled environments. The hybrid vigour was mainly on account of increased, fruit number, weight and size. Based on hybrid vigour, vis-à-vis their mean performance and from consumer view point, the combination Plp-Gy-1 x K-pap, Plp-Gy-1 x K-90, G-1 x Summer Green, G-1 x K-pap and G-3 x Sel-75-2-10 were the most promising one.
Description
Doctoral Dissertation
Keywords
##Unable to generate tags th9518.pdf, Vegetable Science, ##Unable to generate tags th9518.pdf, Cucumber