Determination of heterosis and heterobeltiosis values of salt-tolerant summer squash (cucurbita pepo l.) genotypes and genetic relationships of parental genomes

Abstract

This study was carried out to determine the heterosis and heterobeltiosis values in F1 hybrids which are obtained through hybridization of salt-tolerant genotypes in summer squash (Cucurbita pepo L.). The materials used were the promising hybrid combinations and their parents, which are previously reported among the salt-tolerant genotypes by detecting the influence of parents on heterosis and heterobeltiosis values in advanced hybridization studies. Eight domestic summer squash genotypes (Tutluca 1, Tutluca 2, Halfeti 1, Halfeti 2, Bozova Mrkz, Yaslıca, Konak and Şanlıurfa Mrkz), were chosen from salt-tolerant genotypes and 28 F1 hybrids obtained through hybridization of these genotypes. The heterotic influences were remarkably important, and it was possible to get promising hybrids in terms of examined traits. Parents were evaluated for plant length (cm), stem diameter (mm), plant width-spread (cm), number of leaves (number), 50% female flowering time (day), yield (kg), parental and hybrid heterosis and heterobeltiosis values (%), and parental contribution to heterosis and heterobeltiosis of F1 hybrids. The highest heterotic effect was determined in the summer squash yield traits. In the yield, a maximum of 32.67% heterosis and 24.36% heterobeltiosis values were obtained. Additionally, genetic relationships of parental genotypes based on chloroplast DNA sequence analysis were compatible with results of heterosis and heterobeltiosis.