"GENERATION MEAN ANALYSIS IN BOTTLE GOURD FOR YIELD AND YIELD CONTRIBUTING CHARACTERS [Lagenaria siceraria (Mol.) Standi.]"
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Date
2008-12-16
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MAHATMA PHULE KRISHI VIDYAPEETH, RAHURI - 413 722 DIST. AHMEDNAGAR, MAHARASHTRA (INDIA)
Abstract
The investigation entitled "Generation mean analysis in bottle gourd for yield and yield contributing characters [Lagenaria siceraria (Mol.) Standi.] was undertaken during summer 2007 and Kharif 2007 by following generation mean analysis to obtain information on gene effects, heritability and genetic advance for ten quantitative characters viz., days to first female flowering, nodal position of first female flower, number of primary branches per vine, fruit weight, fruit length, fruit diameter, number of fruits per vine, fruit yield per vine, fruit yield per plot and final vine length. The other two characters viz., sex ratio and incidence of pest and disease were measured. Four possible crosses involving six parents (Samrat, Bhagirati, Pusa Naveen, PBOG-61, NDBG-15 and Pusa Samrudhi) with six generations (Pi, P2, F1, F2, BCi and BC2) for each of these crosses were evaluated in randomized block design with three replications during Kharif, 2007 at All India Co-ordinated Vegetable Improvement Project, Department of Horticulture, MPKV, Rahuri, Dist. Ahmednagar (M.S.). All the three types of gene action viz., additive, dominance and epistasis were present in most of the crosses for almost all the characters except for number of primary branches, fruit diameter, number of fruits per vine and final vine length. Complementary type of epistasis were observed in cross 1 (Samrat x Bhagirati) for fruit weight, fruit diameter, number of fruits pre vine and yield per vine, while cross 2 (Bhagirati x Pusa Naveen) showed complementary type of interaction for number of primary branches and fruit yield per vine. Duplicate type of epistasis was observed in most of the crosses for all the characters. The additive and additive x dominance effects were equally important in some combination for most of the characters. Dominance x dominance gene effects were greater magnitude followed by additive x additive and additive x dominance observed in most of the combination for days to first female flowering, number of primary branches per vine, fruit weight, fruit length, number of fruits per vine, respectively. The selection for these characters should be postponed to later generation. The gene effects revealed that there was predominance of dominance gene effects for most of the characters in most of the all combinations. Highest percentage of heritability and high genetic advance were observed in the cross 1 (Samrat x Bhagirati) for most of the characters like days to first female flower, nodal position of first female flower, fruit diameter and number of fruits per vine. It indicated that most likely the heritability is due to additive gene effects and selection will be effective. In the cross 2 (Bhagirati x Pusa Naveen) the highest heritability coupled with the lowest genetic advance was observed for the characters number of primary branches per vine and fruit weight, it indicated that non additive effects involved in the control of inheritance of characters. In the remaining cross combination the lowest heritability and genetic advance were observed for the most of the characters; it indicated that the characters are influenced by environmental effect and selection could be ineffective.
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