Genetic distance and heterosis through evaluation index in the silkworm, bombyx mori l.

Talebi, Ebrahim and Subramanya, G. (2009) Genetic distance and heterosis through evaluation index in the silkworm, bombyx mori l. World Applied Sciences Journal, 7 (9). pp. 1131-1137. ISSN 1818-4952

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Abstract

Four silkworm races belonging to two different voltine groups (Two multivoltine races namely Pure Mysore and Nistari and two bivoltine races namely C and NB D ) and the twelve regular and reciprocal 108 4 2 hybrids derived from them were reared under standard laboratory condition analysing six quantitative traits namely cocoon weight, shell weight, shell ratio, filament length, denier and renditta. The data of the pure races was analysied for the estimation of evaluation index to study the genetic divergence between the races. Where as evaluation index, heterosis and overdominance effects were studied in twelve hybrid combinations. Varied heterotic effects were observed for different traits for hybrid combination. Cocoon weight and shell weight has maximum heterosis over the mid parent in Pure Mysore Nistari (27 and 42 respectively), whereas C 108 Nistari have shown maximum shell ratio (30) among the crosses. The maximum filament length heterosis was obtained from Nistari Pure Mysore. Heterosis for cocoon weight, shell weight, shell ratio, filament length, denier and renditta based on evaluation index confirmed the above results. The investigation indicates that optimum level of genetic divergence between parents is necessary to obtain heterosis in F generation.

Item Type: Article
Uncontrolled Keywords: Evaluation index and Genetic diversity and Heterosis and Silkworm
Subjects: B Life Science > Sericulture
Divisions: Department of > Sericulture Science
Depositing User: Users 19 not found.
Date Deposited: 13 Sep 2019 09:40
Last Modified: 13 Sep 2019 09:40
URI: http://eprints.uni-mysore.ac.in/id/eprint/8111

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