Estimation of heterosis for yield and yield attributing traits in tomato crossed with line and tester method

Abstract

This study was conducted to estimate heterosis for the yield and yield contributing traits of 32 cross combinations involving 12 diverse lines of some Bangladeshi tomato genotypes considering line x tester mating fashion at the experimental field of Sher-e-Bangla Agricultural University, Dhaka in 2016-2017 and 2017-2018 winter season. The experiment was designed in a Randomized Complete Block Design (RCBD) with three replications. The analysis of variance (ANOVA) showed highly significant difference for all the characters suggesting the presence of genetic variability among the studied materials. Four cross combinations (L₁xT₁, L₃xT₂, L₃xT₃, L₅xT₁) showed desirable negative significant heterosis for days to first flowering in both relative heterosis (RH) and heterobeltiosis (HB) ranged from -2.56% to -19.05%, respectively. Highest positive significant heterosis in both RH and HB was observed in four crosses L₄xT₄ (63.48% and 48.25%), L₅xT₂ (46.77% and 46.27%), L₅xT₄ (62.58% and 34.78%) and L₈xT₃ (37.39% and 35.12%) for individual fruit weight (g), while six crosses L₁xT₂, L₁xT₄, L₃xT₂, L₄xT₄, L₅xT₄ and L₆xT₁ exhibited highest positive significant heterosis for yield per plant (kg) in both HB and RH ranged from 16.09% to 88.46% respectively. Heterotic hybrids with maximum number of studied desirable yield contributing traits (8) of both RH and HB were identified only two crosses L₁xT₂ and L₄xT₄.

Progressive Agriculture 30 (2): 179-185, 2019