Assessment of genetic diversity and path analysis in pumpkin (Cucurbita moschata L.) under tarai of Uttarakhand
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Date
2019-12
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
The present experiment was conducted at Vegetable Research Center of G.B.P.U.A. & T., Pantnagar during spring-summer season of two subsequent years, 2018 and 2019. 40 genotypes including two checks (Pusa Vikas and Pusa Biswas) were laid out in Randomized Block Design with three replications. Observations were recorded on twenty three quantitative and qualitative characters. Analysis of variance showed significant differences for most of the traits except average fruit weight, diameter of main vine and carotenoid content during both the seasons. A narrow range of difference between GCV and PCV was reported for all the traits which indicate these traits are mostly governed by genetic factors with least environmental influence on phenotypic expression. High heritability accompanied with high genetic advance was found for traits days to first female flower, days to first harvest, percent fruit set per plant, number of seeds per fruit and non-reducing sugars, suggest that there is a high scope of improvement in these characters through direct phenotypic selection. Traits such as main vine length, diameter of main vine, fruit set percent, average fruit weight, fruit diameter, flesh thickness, central cavity and carotenoid content showed significant positive association with yield trait. Average fruit weight, fruits per vine, main vine length and diameter of main vine reported to exhibit direct positive association with yield per plant. Out of 7 principle components identified, first three components contributed about 50% in total divergence. All the 40 genotypes of pumpkin were grouped into 7 different clusters. In general inter cluster distances were higher than intra cluster distances, indicating presence of sufficient genetic diversity among the genotypes belonging to the different clusters. Based on fruit yield performance of 40 genotypes under study, four genotypes namely PPU-27 (403.0 q/ha), PPU-16 (392.8 q/ha), PPU-14 (380.1 q/ha) and PPU-12 (365.0 q/ha) found promising for yield as against standard check Pusa Biswas (355.6 q/ha).Therefore, it is recommended that these three genotypes may be utilized as commercial cultivar after following standard release procedure as well as for future breeding programme in pumpkin.
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