Production of New F1 Hybrids Cucumber (Cucumis sativus, L.) in Open Field

Abstract

This investigation was carried out at Kaha Vegetable Research Farm, Kalubia Governorate, Egypt 2015 and 2016 to study heterosis percentage over mid and better parents, potence ratio and correlation coefficient between traits for some important economical characters in cucumber. Five different parental lines of cucumber obtained from Cornell University which included parental line"1380-1"(P1); parental line"87-674-1"(P2); parental line"99-340"(P3); parental line"99-357"(P4) and parental line"99-347"(P5) were carried out by 5 x 5 half diallel mating design, the experimental design was randomized complete block with three replicates. The obtained results generally that the utilized parental lines appeared to have wide ranges of diversity in the different studied traits and their indicated differences were found significant in the most situations. The results exhibited that the highest significant heterosis (47.30%) was reported for early yield per feddan(ton) followed by total yield per feddan (45.81%) and fruit shape index (40.78%), while the largest significant heterosis over better parent (33.97 and 32.86%) was recorded for early yield per feddan followed by (31.53 and 31.50% ) for total yieldThe results illustrated that plant length(cm) and number of leaves per plant exhibited significant and positive genotypic and phenotypic correlation with fruit length(cm), fruit shape index(cm), early yield per feddan(ton), average fruit weight(g), number of fruits per plant and total yield per feddan (ton). These positive correlations indicated that a selection programme based on any of these traits will be resulted in increasing yield. Negative and significant association was estimated with days to anthesis first female flower and fruit diameter(cm).

Production and Evaluation of F1 Hybrids of Protected Cultivation Cucumber

“…The average degree of heritability in the broad sense of the reverse effect was greater than the reciprocal effect, and the low degree of heritability in the narrow sense indicated that the additional action was less than the dominant action in the inheritance of these traits, and also indicated that the genetic effect was higher than the environmental effect of the traits, and for this reason it is possible to follow the hybridization method to improve most of the genetic traits of cucumbers grown in greenhouses by. These results have been agreed by [20], [21], [22] in cucumber and [23] in eggplant…”