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Expression of Heterotic Genetic Interaction among Multivoltine Recurrent Backcross/Congenic Lines for Higher Shell Weight of Silkworm, Bombyx mori L.  

Verma, A.K. (Silkworm Breeding, Genetics and Molecular Biology Laboratory, Central Sericulture Research and Training Institute)
Chattopadhyay, G.K. (Silkworm Breeding, Genetics and Molecular Biology Laboratory, Central Sericulture Research and Training Institute)
Sengupta, M. (Silkworm Breeding, Genetics and Molecular Biology Laboratory, Central Sericulture Research and Training Institute)
Sengupta, A.K. (Silkworm Breeding, Genetics and Molecular Biology Laboratory, Central Sericulture Research and Training Institute)
Das, S.K. (Silkworm Breeding, Genetics and Molecular Biology Laboratory, Central Sericulture Research and Training Institute)
Urs, S.Raje (Silkworm Breeding, Genetics and Molecular Biology Laboratory, Central Sericulture Research and Training Institute)
Publication Information
International Journal of Industrial Entomology and Biomaterials / v.7, no.1, 2003 , pp. 21-27 More about this Journal
Abstract
Manifestation of heterotic genetic interaction was studied in different hybrids made between multivoltine recurrent backcross (RBL)/congenic lines (Con. L) during unfavourable season when temperature and relative humidity are > $30^{\circ}C$ and 86%, respectively. A few number of silkworm race or strain or breed like Nistari (N ＋ p or Np) can sustain the temperature above 3$0^{\circ}C$ and RH above 86%. The present heterosis study screened a hybrid i.e., CB$_{5}$Lm5RBL1DPC-LmE$^1$RBL and its reciprocal provided heterobeltiotic effect on survival by number and pupation rate at a magnitude of 20% (p < 0.01) and yield by weight of 10% (p < 0.01). Beside all the hybrids expressed heterosis over check - Nistari (N ＋ p) with better quality silk. Therefore, aforesaid hybrid may be useful for utilization at commercial level during adverse seasons of West Bengal.gal.
Keywords
Silkworm; Breeding; Syngenic; Recurrent Backcross Line (RBL); Congenic Line (Con. L); Heterosis; Heterobeltiotic; Genetic interaction;
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