To determine the inheritance of fruit yield and its component traits in
cucumber, three commercial monoecious varieties (Pusa Uday, Punjab Naveen
and Pant Kheera-1) were crossed with gynoecious parent (Gy-14) and developed
six generations of each cross. The scaling test and the three-parameter
model of the joint scaling test revealed the presence of epistasis for most
of the traits. Duplicate epistasis was found in the majority of the traits,
which will decrease the net gain from heterozygosity because of epistatic
effects and dominance cancellation. The fruit weight in Gy-14 ? Pant
Kheera-1 showed a higher additive ? dominance type among epistatic
interactions, while fruit length in all crosses and fruit breadth in Gy-14 ?
Pant Kheera-1 showed a higher additive ? additive type of interaction,
indicating the use of pedigree method to improve these traits. Fruit
diameter, fruit weight, number of fruits per plant and yield per plant in
Gy-14 ?Punjab Naveen, and fruit weight in Gy-14 ? Pusa Uday were found to
exhibit a higher dominance ? dominance interaction. Consequently, these
traits can be further enhanced through heterosis breeding in the
corresponding crosses.