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Estimation of Heterosis for Yield and Yield Attributing Traits in Tomato Crossed with Line and Tester Method

S Rehana
Biotechnology and Genetic Engineering Discipline, Khulna University, Khulna 9208

MZ Ullah
Bangladesh Institute of Research and Training on Applied Nutrition, Noakhali

N Zeba
Department of Genetics and Plant Breeding, Sher-e-Bangla Agricultural University, Dhaka

N Narzis
Department of Genetics and Plant Breeding, Sher-e-Bangla Agricultural University, Dhaka

A Husna
Department of Genetics and Plant Breeding, Sher-e-Bangla Agricultural University, Dhaka

AB Siddique
Department of Genetics and Plant Breeding, Sher-e-Bangla Agricultural University, Dhaka

Abstract/ Executive Summary:

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, L₅xT₄and 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.

Keywords: Heterosis; Tomato; Heterobeltiosis; Yield

Location: Genetics and Plant Breeding department, Sher-e- Bangla Agricultural University, Dhaka

Start Date: 00-00-2016

End Date: 00-00-2018

Program Area: Variety and Species

Commodity: Tomato

Objectives:

To estimate heterosis towards development of hybrid varieties using Line x Tester mating design.

Methodology:

The experiment was conducted in the research field of Genetics and Plant Breeding department, Sher-e- Bangla Agricultural University, Dhaka during the winter season of 2016-2017 and 2017-2018. In first year, twelve diverse SAU identified genotypes of tomato were used for making crosses following Line x Tester design. The parental genotypes (eight lines and four testers) and their thirty-two F₁ generations were evaluated during Robi season of 2017-2018. Thirty days old seedlings were transplanted in the main plot on 20 November in each year. The experiment was laid out in RCBD design with three replications having plot size of4.0 sq. m providing a spacing of 60 × 40 cm on 1 m wide bed. Data were recorded on days to first flowering, days to maturity, plant height at last harvest (cm), cluster per plant, fruits per cluster, fruits per plant, individual fruit weight (g), yield per plant (kg), fruit length (mm), fruit diameter (mm). The analysis of variance was carried out as per the methods described by Panse and Sukhatme (1967). Heterosis (%) over mid parent or relative heterosis (RH) and better parent (HB) was calculated after computing heterosis of respective parent by using the following equations: Heterosis over better parent (%) = F1-BP/BP x 100…….(1); Here, F₁=Mean of F₁ individuals BP = Mean of the better parent values; Heterosis over mid parent (%) = F₁-MP/MP x 100 ………(2); Here, F₁=Mean of F₁ individuals MP = Mean of the mid parent values Significance of heterosis was tested with the help of standard error using ‘t’ test.

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

Article Link (Online Journal): DOI: https://doi.org/10.3329/pa.v30i2.42508

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Heterosis by cross pollination between line and testers would help to develop better hybrids with high yield potential acceptable to the consumers. The research findings of this study would also help the researcher to find out the critical areas for the development of new tomato hybrids that some of the investigators were not able to explore. Therefore, a new theory may be handy for many researchers in order to develop better hybrids by cross pollination between the line and testers. Besides, further investigation can be done to exploit hybrid vigor for effective improvement in yield potential of the traits of these tomato genotypes.

Knowledge Management: Journal