Estimation of Gene Effects in Four Bivoltine Silkworm (Bombyx mori L.) Crosses

Six generations (P1, P2, F1, BC1, BC2 and F2) of four bivoltine silkworm crosses (SKAU-R-1×Yakwei, SKAU-R-6×Yakwei, CSR2×CSR4 and SH6×NB4D2) were evaluated in a completely randomized block design with 5 replications for each treatment. The generation mean 2 in respect of 3 metric traits (single coco...

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Bibliographic Details
Published in:International Journal of Industrial Entomology 2004, 8(1), , pp.113-115
Main Authors: Malik, G.N, Singh, T.P, Rufaie, S.Z.Haque, Aijaz, M, Dar, H.U
Format: Article
Language:Korean
Subjects:
Bivoltine
Bombyx mori L
Epistasis
Gene effects
Generation mean
농학
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Summary:Six generations (P1, P2, F1, BC1, BC2 and F2) of four bivoltine silkworm crosses (SKAU-R-1×Yakwei, SKAU-R-6×Yakwei, CSR2×CSR4 and SH6×NB4D2) were evaluated in a completely randomized block design with 5 replications for each treatment. The generation mean 2 in respect of 3 metric traits (single cocoon weight, single shell weight, and shell ratio ％), were subjected to Cavallis joint scaling test. Additive dominance model was found to be adequate in CSR2×CSR4 and SH6×NB4D2 for single cocoon weight and shell weight and SKAU-R-6×Yakwei for shell ratio(％). Whereas, in rest of the crosses epistasis was evident in the traits under investigation. Magnitude of additive gene effect (d) was greater than dominance (h) in SH6×NB4D2 and SKUA-R-6×Yakwei for shell ratio (％) and in CSR2×CSR4 for shell weight. Thus selection for these traits in early segregating generations of these crosses would be effective for obtaining considerable genetic gain.
ISSN:1598-3579
2586-4785