Md. Marufur Rahman, Takia Tanzina Akhter Bhuiyan, Kamrunnahar, Masuma Rahman, Naheed Zeba*

*Corresponding author: naheed0359@yahoo.com


A field experiment was conducted with the objective of estimating nature and magnitude of genetic variations existing in fifteen bitter gourd genotypes. The experiments were laid out in randomized complete block design with three replications. Ten quantitative traits were subjected to analyze variability, heritability and genetic advance. Genotypes differed significantly at p < 0.01 for all the traits studied, which implies that the genotypes contain adequate genetic variability. For all traits the genotypic coefficient of variation (GCV) is slightly less than the phenotypic coefficient of variation (PCV) which revealed that the observable variation was mostly genetic but very little environmental impact was present in the expression of the traits. The maximum coefficient of variation were found for fruit length, fruit weight, fruit yield per plant and branch per vine at genotypic and phenotypic level, indicating the higher magnitude of variability for these traits and consequently more scope for their improvement through selection. Heritability in broad sense ranged from 77.47% in vine length to 99.56% in days to first flower female. The range of genetic advance as percent of mean was 13.39% in days to first flower male to 90.26% in fruit weight. High heritability estimates were obtained for all the characters studied except for branches per vine suggesting that almost all of the traits under study are primarily under genetic control. High heritability coupled with high genetic advance was found for fruit length, fruit breadth, fruit weight and number of fruit per plant indicated that additive genes controlling these traits. The current study indicated that these four traits are important yield related traits and could be used for phenotypic selection in bitter gourd breeding programs.

Keywords: Bitter gourd; genetic variability; heritability; genetic advance.

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