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Performance of Newly Evolved Bivoltine Silkworm Hybrids of Bombyx mori with Reference to Hybrid Vigour

Reddy, N.Mal   (Central Sericultural Research and Training Institute  ); Basavaraja, H.K.   (Central Sericultural Research and Training Institute  ); Kumar, N.Suresh   (Central Sericultural Research and Training Institute  ); Joge, P.G.   (Central Sericultural Research and Training Institute  ); Kalpana, G.V.   (Central Sericultural Research and Training Institute  ); Dandin, S.B.   (Central Sericultural Research and Training Institute  );
  • 초록

    In the present study, hybrid vigour in terms of heterosis and over dominance of newly evolved bivoltine hybrids and their reciprocals raised from the promising newly evolved bivoltine breeds were calculated for the important parameters like pupation, cocoon yield, cocoon weight, shell weight, shell ratio, raw silk percentage, filament length and neatness. Through there was no significant difference among the hybrids for the characters pupation, cocoon yield and cocoon weight, the magnitude of heterosis and over dominance were varied significantly for these characters. However, significant differences were observed between new hybrids and control hybrid for the characters like cocoon shell weight, cocoon shell ratio, filament length and raw silk percentage. The results indicate that majority of new hybrids have shown higher heterosis and over dominance than control hybrid. The data also indicate that highest mean heterosis of all new hybrids was recorded for cocoon yield followed by filament length. Whereas highest mean over dominance was recorded for cocoon yield followed by cocoon weight. Negative mean heterosis and over dominance were recorded for the trait cocoon shell ratio. Based on the results, the importance of three hybrids viz., CSR2 ${\times}$ CSR4, CSR2 ${\times}$ CSR5 and CSR3 ${\times}$ CSR6 and their reciprocals (CSR4 ${\times}$ CSR2, CSR5 ${\times}$ CSR2 and CSR6 ${\times}$ CSR3) which exhibited significant heterosis and over dominance, for commercial exploitation was discussed.


  • 주제어

    Bombyx mori .   New bivoltine hybrids .   Hybrid vigour .   Heterosis .   Over dominance.  

  • 참고문헌 (14)

    1. Basavaraja, H. K., S. Nirmal Kumar, N. Suresh Kumar, N. Mal Reddy, Kshama Giridhar, M. M. Ashan and R. K. Datta(1995) New productive bivoltine hybrids. Indian Silk 34, 5-9 
    2. Datta, R. K., H. K. Basavaraja, N. Mal Reddy, S. NirmalKumar, M. M. Ahsan, N. Suresh Kumar and M. RameshBabu (2000a) Evolution of new bivoltine hybrids, CSR2 $\times$CSR4 and CSR2 $\times$ CSR5. Sericolosia 40, 151-167 
    3. Subba Rao, G. and V. Sahai (1990) Combining ability and het-erosis studies in bivoltine strains of silkworm Bombyx moriL. Uttar Pradesh J. Zool. 9, 150-164 
    4. Datta, R. K., H. K. Basavaraja, N. Mal Reddy, S. NirmalKumar, N. Suresh Kumar, M. Ramesh Babu, M. M. Ahsanand K. P. Jayaswal (2001) Breeding ofnew productive bivol-tine hybrid, CSR12 $\times$ CSR6 of silkworm Bombyx mori L.Int. J. Indust. Entomol. 3, 127-133 
    5. Yokayama, T. (1957) On the application of heterosis in Japa-nese sericulture. Proc. Int. Genet. Sympo. 527-531 
    6. Krishnaswami, S. (1978) New technology of silkworm rearing.CSRTI, pp. 21-23, Mysore, India 
    7. Harada, C. (1961) Heterosis of quantitative characters in thesilkworm. Bull. Sericul. Exp. Sta. 17, 1-52 
    8. Hirobe, T. (1957) An analysis made with the silkworm. Proc.Int. Gent. Symp. Suppl. 357-361 
    9. Sengupata, K., R. K. Data, S. N. Biswas and B. D. Singh(1971) Heterosis in multivoltine silkworm Bombyx mori L.yield performance of $F_1$ hybrids of Nistari and four evolvedmultivoltine breeds. Indian J. Seric. 10, 6-13 
    10. Nagaraju, Y., Raje Urs and R. K. Datta (1996) Cross breedingand heterosis in the silkworm, Bombyx mori, a review. Seri-cologia 36, 1-20 
    11. Kobayashi, E., T. Gamo and Y. Otsuka (1968) Analysis Of het-erosis by means of diallel cross between different regionalvarieties of the silkworm, Bombxy mori L. data of a pilotexperiment. J. Seric. Sci. Jpn. 37, 144-150 
    12. Gamo, T. and T. Hirabayashi (1983) Genetic analysis ofgrowth, pupation rate and some quantitative characters bydiallel cross in silkworm, Bombyx mori. Jpn. J. Breed. 33,178-190 
    13. Datta, R. K., H. K. Basavaraja, N. Mal Reddy, S. NirmalKumar, M. M. Ahsan, N. Suresh Kumar and M. RameshBabu (2000b) Evolution of new bivoltine hybrids CSR3 $\times$CSR6. Sericologia 40, 407-416 
    14. Mano, Y. (1994) Comprehensive report on silkworm breeding.Central Silk Board, pp. 73-74, Bangalore, India 

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