Indian Society of Genetics & Plant Breeding

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HETEROSIS AMONG THE LINES SELECTED FOR PUPAL WEIGHT IN THE DIRECT AND RECIPROCAL HYBRIDS OF MULBERRY SILKWORM BOMBYX MORl L.

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Manifestation of heterosis in interbreed crosses of high, medium, low and control
lines selected for pupal weight in silkworm is reported. Significant positive heterosis
over better parent in the selected and correlated traits was obtained due to the
wider genetic distance noticed in Pure Mysore (multivoltine) and NBtS (Bivoltine).
Whereas, the magnitude of heterosis varied among interbreed crosses which involved
all three types of gene effects (additive, dominance and epistatic interactions). The
present study indicated that heterosis was more pronounced in the crQsses involving
bivoltine which happen to be either low male or female component and is dearly
demonstrated in the heterosis averaged over male and female parents. Higher pupal
weight does not necessarily result in higher heterotic values so, while selecting the
parents for commercial exploitation differential pupal weight should also need to
be considered.
 

Keywords: Mulberry silkworm, pupal weight, selection, heterosis.

Info

Year: 1998
Volume: 58
Issue: 3
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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