Research Article | Published: 01 September 2010

Estimation of general and specific combining ability and heterosis to identify suitable parents in Oak Tasar silkworm breeds

N. Ibotombi Singh, L. Somen Singh and K. Chaoba Singh

Journal of Non-Timber Forest Products | Volume: 17 | Issue: 3 | Page No. 283-290 | 2010
DOI: https://doi.org/10.54207/bsmps2000-2010-6946KE | Cite this article

Abstract

Two species of oak tasar silkworm, namely Antheraea proylei Jolly and Antheraea pernyi Guerin- Menevelle and eight synthesized breeds named PRP₂, PRP₃, PRP₅, PRP₁₂, RPP₄, Blue, B₆ and BY₁ were used in full 12 diallel cross mating system and 90 F₁ hybrids were generated. Combining ability analysis was carried out for eight important economic characters, viz., fecundity, hatching, survivability (effective rate of rearing, ERR %), cocoon yield (number of cocoons per disease free laying, dfl), cocoon weight, shell weight, shell ratio, and filament length following full diallel cross analysis given by Griffing (1956a and b). The variances due to general combining ability (GCA) and specific combining ability (SCA) showed the importance of both additive and non-additive gene effects in the inheritance of the eight characters studied. The values of the ratio of the non-additive genetic variance to additive variance showed that non- additive gene action played great role in the inheritance of the traits-hatching. cocoon yield, survivability (ERR), cocoon weight, shell weight, shell ratio and filament length. Significant reciprocal variances revealed in seven parameters viz., fecundity, hatching percentage, cocoon yield per dfl, ERR, cocoon weight, shell ratio and filament length indicated the maternal effects in these traits. The breed viz. BY₁ exhibited significant GCA effects in majority of the characters followed by B6 and PRP₁₂ which indicates that that these breeds are good combiners. The analysis of SCA effects and reciprocal effects in 90 crosses revealed that none of the hybrids was consistently good in all the eight characters studied. Only two crosses showed significant SCA effects in four characters and two crosses showed significant SCA effects in three characters while a few hybrids showed significant effects in one or two characters only. Among the indirect crosses, only one cross showed significant reciprocal effects in four characters and four crosses showed significant reciprocal effects in three characters while a few hybrids showed significant effects in one or two characters only. The three hybrids namely PRP₁₂ X Blue, BY₁ X PRP₅ and B₆ X PRP₁₂ which showed significant SCA effects and heterobeltiosis in most of the desired characters may be recommended for further field trial rearing for commercial exploitation.

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How to cite

Singh, N.I., Singh, L.S. and Singh, K.C., 2010. Estimation of general and specific combining ability and heterosis to identify suitable parents in Oak Tasar silkworm breeds . Journal of Non-Timber Forest Products, 17(3), pp.283-290. https://doi.org/10.54207/bsmps2000-2010-6946KE

Publication History

Manuscript Published on 01 September 2010

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