Author(s):

MK Singh, VB Singh, GC Yadav and Pushpendra Kumar

Abstract: The experiments were laid out in RBD with three replications having each experimental unit of single row with spacing of 3.0 m (R×R) × 0.5 m (P×P) involving 7 parents namely, Narendra Agrim (P₁), Narendra Amrit (P₂), Narendra Upkar (P₃), NDPK-76-1 (P₄), NDPK-724 (P₅) and NDPK-39-2 (P₆) and NDPK-12-10 (P₇) of pumpkin and their 21 F₁ hybrids produced in diallel mating design excluding reciprocals at MES, Vegetable Science, NDUA.&T, Kumarganj, Faizabad (U.P.) India in Zaid, 2016. The observations were recorded on parents and F₁’s for twenty quantitative traits including six quality traits viz., node number to first male flower appearance, node number to first female flower appearence, days to first male flower anthesis, days to first female flower anthesis, days to first fruit harvest, vine length (m), internodal length (cm), number of primary branches per plant, fruit weight (kg), number of fruits per plant, equatorial circumference of fruit (cm), polar circumference of fruit (cm), flesh thickness (cm), fruit yield per plant (kg), and six quality/biochemical traits namely ascorbic acid, reducing sugars (%) non-reducing sugars (%), total sugars (%), dry matter content and total soluble solids. Analysis of variance revealed that the mean square differences due to genotypes, parents and hybrids were found highly significant for all the traits. The mean squares due to parents vs. hybrids was also found significant for all traits studied in experiment except for node number to first male and female flower appearance, days to first male and female flower anthesis, days to first marketable fruit harvest, average fruit weight and total sugars. The highest phenotypic as well as genotypic coefficients of variation were observed in case of node number to first male flower appearance, vine length, fruit yield per plant recorded high estimates of PCV and GCV suggesting substantial variability for the observed traits, thereby ensuring ample scope for improvement of these traits through selection. The estimates of high heritability coupled with high genetic advance as per cent of mean were observed for node number to first male flower appearance, node number to first female flower appearance and non-reducing sugar. The most important trait fruit yield per plant had exhibited significant and positive phenotypic correlation with number of fruits per plant, average fruit weight, total soluble solids, vine length, flesh thickness, ascorbic acid content, total sugars, number of primary branches per plant, equatorial circumference of fruit and negative significant association with days to first male flower anthesis, days to first female flower anthesis, days to first fruit harvest, inter nodal length and node number to first male flower appearance at phenotypic level.

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