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Genotypic Response to Environment and Stability Appraisal in Tomato (lycopersicon Esculentum Mill.)

M. Akhlasur Rahman
Plant Breeding Division, Bangladesh Rice Research Institute, Gazipur-1701, Bangladesh.

Hosneara Hossain
Dept. of Genetics and Plant Breeding, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

M. A. Hossain
Dept. of Farm Structure, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

M. K. Hossain
Plant Breeding Division, Bangladesh Rice Research Institute, Gazipur-1701, Bangladesh.

M. Khatun
Plant Breeding Division, Bangladesh Rice Research Institute, Gazipur-1701, Bangladesh.

Abstract/ Executive Summary:

Genotype and environment response study was carried out with 9 genotypes and a check variety under five environmental conditions. Mean squares due to environmental variations, genotypes and g x e interaction were highly significant for 4 characters under study. Most of the genotypes were responsive to environmental changes, and performance of these genotypes could hardly be predicted. World Champion and Gen-3 were the most stable genotypes for early flowering and Gen-I was found to be stable for 50% flowering in this model. Gen-1, Gen-5 and Gen-7 were found to be stable for number of fruits/plant and Gen-18 was responsive and suited for favourable cultural environments. For individual fruit weight Gen-1, Gen-6 and Gen-15 were found stable and well adapted. Gen-1, Gen-5 and Gen-7 were found stable for yield/plant, while World Champion, Gen-6, Gen-15 and Gen-18 were sensitive to changes in environments and adapted to favourable environments only. However, Gen-1, Gen-5 and Gen-7 recorded high mean number of fruits/plant and yield, average responsiveness to environment and stability in both the approaches. These genotypes could be recommended for large-scale cultivation. To obtain high yielding and stable segregants, these genotypes may be used in breeding programme.

Keywords: Genotype-environment response (interaction), Tomato, Grouping technique

Location: Department of Genetics and Plant Breeding, Bangladesh Agricultural University, Mymensingh

Start Date: 00-08-1999

End Date: 00-04-2000

Program Area: Variety and Species

Commodity: Tomato

Objectives:

To study GXE response and to identify both high yielding and stable genotypes of tomato over environmental changes.

Methodology:

The research was conducted at the Experimental Farm of the Department of Genetics and Plant Breeding, Bangladesh Agricultural University, Mymensingh during off season (August- December 1999) and on season (November-April 2000). Ten genotypes of tomato were grown in a Randomized Complete Block (RCB) design with three replicates under five cultural environments. For the study (G-E interaction) three spacing densities, two fertilizer packages and two transplanting dates with seedlings of the same seeding date but differential age at transplanting were manipulated to create five experimental (cultural) environments. Data were recorded on an individual plant basis from five randomly selected plants per genotype in a replicate. According to this technique, a scatter graph was plotted in which the abscissa was marked with grading of a character and the ordinate with coefficient of variation (CV). Observed mean values of respective genotypes were then plotted against their CV% for a character. The vertical line on this graph represented overall mean of all the genotypes and the horizontal line represented CV percentage.

Source of Information: The Agriculturists, Vol: 4, (No-1&2), pp: 59-66, Dec 2006

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The study revealed that genotypes Gen-1, Gen-5 and Gen-7 showed superiority over the other genotypes tested. High mean performance, responsiveness to environment and stability of yield and its component traits under study were recorded in these 3 genotypes in both the methods. These genotypes could be recommended for commercial exploitation through wide cultivation. To obtain high yielding and stable segregants, these genotypes may be used in designing breeding programme. It is also observed that the simple genotype grouping technique is an efficient tool in identifying the stable genotypes.

Knowledge Management: Journal