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Inheritance of Length and Weight of Mature Larvae in Six-parent Diallel Crosses of Mulberry Silkworm, Bombyx Mori L.

H A Rashid
Department of Zoology, Rajshahi University, Rajshahi-6205, Bangladesh

M K Ahsan
Department of Zoology, Rajshahi University, Rajshahi-6205, Bangladesh

M A Hasan
Department of Zoology, Rajshahi University, Rajshahi-6205, Bangladesh,

I Mahfus
Monash Institute of Medical research, Monash University, Clayton – 3168, Melbourne, Australia

Abstract/ Executive Summary:

Context: To gain a better understanding of the nature of gene action involved in the inheritance of quantitative characters can be obtained through the use of diallel cross analytical approach for the choice of desirable parents and the formulation of an effective breeding programme. Objectives: The aim was to study the nature and magnitude of gene action of inheritance for quantitative traits, length and weight of mature larvae in B. mori through six-parent diallel cross analysis in four rearing seasons. Materials and Methods: Six inbred varieties of B. mori were used as parents for a diallel cross. The experiment was conducted in four rearing seasons. Mature larval length (cm) and weight (gm) were collected for statistical analysis. The data were analyzed following the biometrical techniques proposed by Jinks and Hayman (1953), Hayman (1954), Dickinson and Jinks (1956) and Jhonson and Aksel (1964). Results: In the Hayman’s analysis of variance for length and weight of mature larvae the items ‘a’ and ‘b’ were found to be significant against all the three tests of significance. The item ‘b2’ was significant for the seasons S- 2 and S-3 and the ‘b3’ item was significant for all the seasons. The Items ‘c’ and ‘d’ were insignificant in all the seasons. The regressions of Wr on Vr for majority of the seasons were significant but did not deviate significantly from unit slope. The varieties Nistari, Nistari oval (G) and NanNung 7B of S-1, S-2 and S-4, and Nistari of S-3 for length of larvae and Nistari and Nistari oval (G) of S-1, S-2 and S-3 and Nistari, Nistari oval (G) and Nan Nung 7B of S-4 for larval weight possessed an excess of recessive genes of negative effect. But Nistari oval (G) in S-3 for LL possessed excess of recessive genes with positive effects. On the other hand BSRI-95, BSRI-98 and BV (high) in S-1, S-2 and S-4, and Nan Nung 7B, BSRI-98 and BV(high) in S-3 for LL and BSRI-95, BSRI-98 and BV(high) in S-1, S-2 and S-3, and BSRI-95 and BV(high) in S-4 for LW possessed an excess of dominant genes, which was positive in nature. In S-3 only BSRI-95 for LL and NanNung7B in S-1, S-2 and S-3 and BSRI-98 in S-4 for LW possessed an excess of dominant genes of negative nature. At least one group of dominant genes was involved in controlling these characters. The broad sense heritability was high in all seasons for both the characters whereas the narrow sense heritability was moderate for majority of the seasons except S-3 and S-4 for LW. Conclusion: High heritability, dominant and recessive gene effects suggest that these parents could be used to develop better lines in respect of larval characters investigated in this study and selection programmes will be effective in early generations.

Keywords: Inheritance, Larval length, Larval weight, Diallel crosses, Bombyx mori.

Location:

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Silkworm

Objectives:

The aim was to study the nature and magnitude of gene action of inheritance for quantitative traits, length and weight of mature larvae in B. mori through six-parent diallel cross analysis in four rearing seasons.

Methodology:

The materials of the present experiments comprised of six varieties of parents, Bombyx mori L. which include five multivotine: Nistari, Nistari oval (G), BSRI-95, Nan Nung-7B, BSRI-98 and one bivoltine varieties: BV (High) and their 30 F1s obtained by crossing the parents in diallel fashion including reciprocals. The experiment was conducted in four rearing seasons corresponding to commercial rearing seasons as practiced by farmers in Bangladesh. These rearing seasons were Agrahyoni (October-November), Chaita (February-March), Jaistha (May-June) and Bhaduri (August). For each genotype three dfls were brushed in three separate rearing trays (45×30×6 cm) in a randomized design with three replications. Each rearing tray was considered as a replication in this investigation. Rearing of silkworm larvae was conducted following the scientific technology of Krishnaswami (1978) and Rahman (1983). Data collected on length (cm) and weight (g) were analyzed following the diallel techniques of analysis as developed by Jinks and Hayman (1953), Hayman (1954), Dickinson and Jinks (1956) and Jhonson and Aksel (1964). Results are interpreted mainly in two approaches. Equations are derived and solved to obtain estimates of the genetic parameters D, h₁, h₂, h² and F which are interpretable on the basis of diallel theory of Hayman (1954). Alternatively, results in terms of genetical control of the characters are interpreted by constructing graphs.

Source of Information: J. bio-sci. 21: 77-87, 2013 ISSN 1023-8654

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Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

High heritability, dominant and recessive gene effects suggest that these parents could be used to develop better lines in respect of larval characters investigated in this study and selection programmes will be effective in early generations.

Knowledge Management: Journal