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Genetic Variability, Heritability and Correlation Analysis for Some Characters in Hybrids of the Mulberry Silkworm, Bombyx Mori L.

Md. Kamrul Ahsan
Department of Zoology, University of Rajshahi, Rjshahi 6205, Bangladesh

Sowdagar Mahfuzar Rahman and
Department of Zoology, University of Rajshahi, Rjshahi 6205, Bangladesh

Md. Tajimul Haque
Former Senior Scientific Officer
Bangladesh Sericulture Research and Training Institute, Rajshahi 6100, Bangladesh;

Abstract/ Executive Summary:

Genetic variability, heritability and correlation analysis for some important economic characters in 35 hybrids of the silkworm, Bombyx mori L. have been investigated. Higher heritability values were recorded for effective rate of rearing by number (ERRn), followed by estimated cocoon yield per 100 dfls (ECY), weight of mature larvae (WML), filament length (FL) and effective rate rearing by weight (ERRw). Furthermore, characters such as FL, ERRn, ERRw and ECY showed higher genetic advance coupled with higher heritability values, indicating the importance of additive gene effect of these characters. The genotypic correlations were higher than the phenotypic correlations for all the characters under study. These low phenotypic correlations could be due to a modifying effect of environment of the association of characters at genotypic level. Most of the characters showed positive significant correlation to each other except ERRn and ERRw pair at phenotypic level. Therefore, proper attention should be given to these characters, especially WML, FL and ECY, in selection programmes for genetic gain in B. mori.

Keywords: Genetic variability, Heritability, Correlation, Economic characters, B. mori.

Location: Department of Zoology, University of Rajshahi

Start Date:

End Date:

Program Area: Development of Host and Medicinal Plants

Commodity: Silk

Objectives:

Here we report the genetic variability, heritability and genetic advance for some important quantitative characters in a large number of hybrids of B. mori, along with correlations among the characters at both phenotypic and genotypic levels.

Methodology:

The materials for this experiment were produced from 18 bi- and multivoltine varieties of B. mori, the parental stocks of which were obtained from the Germplasm Bank maintained at the Bangladesh Sericulture Research and Training Institute (BSRTI), Rajshahi. Eggs from disease-free layings (dfls) of the F1 hybrids for each genotype were brushed in a randomized design with three replicates each. Scientific technology of silkworm rearing (Krishnaswami 1978, Rahman 1983) was maintained in the rearing house No. 2 of the BSRTI, Rajshahi. Economic characters recorded for this study were: weight of mature larvae (WML), effective rate of rearing by number (ERRn), effective rate rearing by weight (ERRw), filament length (FL) and estimated cocoon yield per 100 dfls (ECY). Data were analyzed successively for estimated genetic variability, heritability and genetic advance according to the formulae described by Lush (1949), Burton (1952), Burton and De Vane (1953), Johnson et al. (1955) and Hanson et al. (1956). The phenotypic and genotypic correlations were calculated in the usual way.

Source of Information: J. Life Earth Sci., Vol. 5: 43-46, 2010 ISSN 1990-4827

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Genetic variability, heritability and correlation analyses for important economic characters such as WML, ERRn, ERRw, FL and ECY in 35 hybrids B. mori L. revealed that most of the characters showed positive significant correlation to each other except ERRn and ERRw at phenotypic level. Therefore, proper attention should be given to these characters, especially WML, FL and ECY, in selection programmes for genetic gain in the mulberry silkworm.

Knowledge Management: Journal