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Combining Ability of Some Cocoon Characters in Silkworm,bombyx Mori L.

M T Haque
Senior Research Officer
BSRTI, Rajshaji

K T Haque
Senior Research Officer
BSRTI, Rajshahi

M M Ali
Senior Research Officer
BSRTI, Rajshahi

M F Haque
Research Officer
BSRTI, Rajshahi

M Jasimuddin
Assistant Research Officer
BSRTI, Rajshahi

Abstract/ Executive Summary:

Combining ability through line x tester analysis for yield contributing characters in silkworm, Bombyx mori L. was conducted in two commercial rearing seasons of Bangladesh. The investigation highlighted variance due to specific combining ability in S2 (Chaita) exhibited that non – additive component was predominant while the higher ðgca/ð2 Sca values in S1, (Agrahyoni) indicating the predominance of additive gene action. nistari(P), Nistari(L) and Ziangsu-12 (J) among line as well as testers were indentified the best general combiners having good general combining ability for yield characters. Based on gca and sca results, Nistari (P) ×RB-SB in agrahyom and Nistari (L) ×Ziangsu-12(P) and Nistari (B)×Rb-Sb in chaita were treated as the promising crosses.

Keywords: Bombyx mori L., Combining ability, Line × Testar.

Location: Bangladesh Sericulture Research and Training Institue, Rajshahi

Start Date:

End Date:

Program Area: Socio-economic and Policy

Commodity: Silkworm

Objectives:

To find out the combining ability in silkworm for some yield contributing characters.

Methodology:

A line x tester matihe, design was followed with 6 lines (Nistari (M)-p1 Nistari (P) –P2, Nistari (L)-P3, Nistari (SL)-P4, Nistari (IJ)-P5 and Nistari (B)-P6 ) and 3 testers (Zianosu 12(J)-P7, Ziangsu-12 (P)-P8 and RB-SB-P9) of silkworm Bombyx mori L. Finally, experimantal materials like 18F1, and 9 parents in total 27 were reared in a randomized block design with three replication in two commercial rearing ,seasons viz., Agrahyoni (October-November)-S1, and Chaita (February- March )-S2. Scientific rearing techniques suggested by cocoon weight, shellweight, SR%, filament length and denier were recorded. The collected data were subjected to line× tester analysis.

Source of Information: Bangl. J. Seric. 2008-2009 vol.2&3. 2008-2009 published by Bangladesh Sericulture Research and Training Institute.

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The results clearly indicated that,the combinations Nistary(P) ×PR-SB followed by Nistari (M)×Ziangsu 12(P) and Nistari (SL)×RB-SB in S1,(Agrahyoni) while Nistari (L) × Ziangsu 12 (J),Nistari(B)× Ziangsu-12(P) and Nistari (B)× RB-SB in S2 (Chaita) exhibited comparatively much encouraging performance.

Knowledge Management: Journal