Abstract

To study the genetic variability and selection index of selected tomato genotypes, an experiment was conducted at the farmer’s field of Chirirbandar Upazilla of Dinajpur District, Bangladesh. Ten tomato genotypes were evaluated in a randomized completely block design with four replications. The study results displayed high heritability plus higher genetic advance for all the traits studied. Among the traits, plant height showed high genotypic and phenotypic coefficients of variation over other traits. Yield per plant alone had 100% expected genetic gain and the relative effectiveness of the other functions was calculated in like manner. Selection indices exhibit eight traits association (yield plant-1 with plant height, canopy width, days to flowering, fruit diameter plant, fruit length, single fruit weight), and therefore the number of marketable fruit is simpler for genetic improvement thanks to the most expected genetic gain (665.23) with maximum relative efficiency (125.88%). Based on the selection index value and total rank value for selection criteria, the eight-traits combined with V6 and V10 are the promising genotypes that can be used as potential gene donor for further breeding program.

Key words: Genetic variability, selection index, tomato.