GENETIC VARIABILITY AND DIVERGENCE STUDIES IN F4 GENERATION OF PUMPKINS (Cucurbita sp.)
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Date
2015-07
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K.R.C. COLLEGE OF HORTICULTURE, ARABHAVI (UNIVERSITY OF HORTICULTURAL SCIENCES, BAGALKOT)
Abstract
Sixty pumpkin genotypes were evaluated in randomized block design with two replications to study the variability, correlation and divergence at K.R.C. College of Horticulture, Arabhavi (Karnataka) during 2014-15. Highly significant (P=0.01) differences among genotypes was observed for all the characters studied except for the number of ridges per fruit. High genotypic and phenotypic coefficient of variations were observed for β-carotene content of fruit, seed cavity length, fruit yield per hectare, fruit yield per vine, number of seeds per fruit, average fruit weight and fruit length indicating broad genetic base for these traits. Very high heritability with high genetic advance was observed for β-carotene content of fruit, average fruit weight, seed cavity length, number of seeds per fruit, fruit yield per vine, fruit length and number of fruits per vine indicating predominance of additive component for these traits and hence, direct selection would be more effective in improving these traits.
Fruit yield per hectare was positively and significantly associated with fruit yield per vine, average fruit weight, number of fruits per vine, vine length, fruit width, fruit length, number of primary branches and fruit flesh thickness. Path analysis studies revealed high direct effects of days to first male flowering, average fruit weight, number of fruits per vine, fruit yield per vine, days to first female flowering and fruit length on fruit yield per hectare.
By following Mahalanobis D2 analysis, 60 genotypes of pumpkins were grouped into 11 clusters. The cluster X showed maximum intra- cluster distance and the maximum inter-cluster distance was observed between clusters X and XI. Among the 22 characters included in D2 analysis, β-carotene content of fruit (38.362%) contributed maximum to the total genetic diversity. The high yielding genotypes KP-14-18, KP-14-23, KP-14-16, KP-14-47 and KP-14-21 can be further assessed for the stability before exploiting them for future use.
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TH533
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