Abstract: The genetic effects of main traits in bitter gourd were analysed by using genotype ×environment interaction model with 7 inbreed lines and their 21 hybrids culturing in spring and autumn. The results indicated that most tested traits including early fruit yield per plant ( efy) , fruit weight ( fw) , fruit length
( fl) , fruit diameter ( fd) , pericarp thickness (p t) , index of fruit shape ( ifs) were mainly controlled by the additive effects, their proportion of additive variances in phenotypic effective accountive was 45.2%, 70.7%,89.4% , 38.1% , 41.2% and 22.0% respectively, all of which were significant at 0.01 level; However,fruit yield per plant ( fy) and fruit number per plant ( fn) were significantly more impacted by additive ×environment interaction than that by additive effects, the variance proportion of which were 24.5% and 38.1%.
All the economic traits influenced by dominance or dominance ×environment, but their variance proportion was smaller compared to additive or additive ×environment. General heritabilities in the narrow and broad sense were significant at 0.01 level for all traits except fn. Interaction heritabilities in the narrow and broad sense for fn were the highest in those of the investigated traits and significant at 0.01 level.

Key words: bitter gourd, economic trait, genotype, environment, interaction