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Heterobeltiotic Genetic Interaction between Congenic and Syngenic Breeds of Silkworm, Bombyx mori L.  

Verma A. K. (Silkworm Breeding Genetics and Molecular Biology Laboratory, Central Sericultural Research and Training Institute)
Chattopadhyay G. K. (Silkworm Breeding Genetics and Molecular Biology Laboratory, Central Sericultural Research and Training Institute)
Sengupta M. (Silkworm Breeding Genetics and Molecular Biology Laboratory, Central Sericultural Research and Training Institute)
Das S. K. (Silkworm Breeding Genetics and Molecular Biology Laboratory, Central Sericultural Research and Training Institute)
Sarkar A. K. (Silkworm Breeding Genetics and Molecular Biology Laboratory, Central Sericultural Research and Training Institute)
Publication Information
International Journal of Industrial Entomology and Biomaterials / v.11, no.2, 2005 , pp. 119-124 More about this Journal
Abstract
To determine the level of heterosis, higher cocoon shell weight multivoltine congenic lines (Con. L) and bivoltine syngenic lines (Syn. L) of silkworm were used for crosses. First filial generations $(F_1s)$ expressed heterobeltiotic genetic interaction at significant magnitude (p < 0.01) for single cocoon shell weight (SCSW). The other linked characters viz., single cocoon weight (SCW) and yield by weight per 10, 000 larvae were also significantly higher (p < 0.01) than the better parental lines. All the hybrids showed significant improvement for these aforesaid characters over standard heterosis (Standard check). The reeling parameters viz., filament length, raw silk, neatness, cohesionstrokes etc, also showed improvement among the hybrids than check in congenial environment. Overall results suggested that the cross between congenic and syngenic lines provide better heterosis with good quality silk than conventional hybrids and may be used for commercial exploitation.
Keywords
Silkworm; Breeding; Syngenic line (Syn. L); Recurrent backcross line (RBL) Congenic line (Con. L); Heterobeltiotic; Multigenic;
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