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Research Detail

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R.F. Rahman
Bangladesh Sericulture Research and Training Institute, Ministry of Textiles and Jute, Baliapukur, Rajshahi, 6207, Bangladesh

M.M. Ali
Bangladesh Sericulture Research and Training Institute, Ministry of Textiles and Jute, Baliapukur, Rajshahi, 6207, Bangladesh

M.A. Salam
Bangladesh Sericulture Research and Training Institute, Ministry of Textiles and Jute, Baliapukur, Rajshahi, 6207, Bangladesh

J. Ara
Bangladesh Sericulture Research and Training Institute, Ministry of Textiles and Jute, Baliapukur, Rajshahi, 6207, Bangladesh

M.K. Ahsan
Bangladesh Sericulture Research and Training Institute, Ministry of Textiles and Jute, Baliapukur, Rajshahi, 6207, Bangladesh

M.T. Haque
Bangladesh Sericulture Research and Training Institute, Ministry of Textiles and Jute, Baliapukur, Rajshahi, 6207, Bangladesh

Heterosis and combining ability studies of the isolated variable multivoltine races and developed bivoltine races with high yield capacity and their eighteen combinations were evaluated in two commercial rearing seasons in Bangladesh. Appropriate statistical methods were employed to interpret data on the hybrid performance, general and specific combining ability of the hybrids. Analysis of variance for combining ability revealed larger mean squares. Here high δ2 gca/δ2 sca values for most of the characters reflected predominant additive gene action. Similarly, the variance of components of specific combining ability (δ2 sca) of multivoltine×bivoltine were higher than those of general combining ability (δ2 gca) for most of the characters in both the seasons indicating preponderance of non-additive gene action inheritance of all these traits. Among the combinations BSR-BN(B1)×BSRB-BB1 and BSR-3×BSRB-BB2 exhibited highly productive performance which could be recommended for commercial cocoon production in Bangladesh.

  Bombyx mori L., Heterosis, Combining ability
  Bangladesh Sericulture Research and Training Institute, Ministry of Textiles and Jute, Baliapukur, Rajshahi
  
  
  Variety and Species
  Silkworm

To find out the magnitude of heterosis and combining ability in silkworm for characters contributing to yield.

Materials: A line×tester crossing design was followed where 6 lines of multivoltine (BSR-BN(M)-P1, BSR-BN(B1)-P2, BSR-BN(P)-P3, BSR-IDC-P4, BSR-3-P5, BSR-10-P6 and 3 testers of bivoltine (BSRB-BB1-P7, BSRB-BB2-P8 and BSRB-03(sl)-P9) silkworm B. mori L. were utilized for the experiment. Methods: A total of 27 hybrid combinations and parents were developed through line×tester analysis technique (Kempthorne, 1957). The experiment was conducted in three replications in the two very important commercial rearing seasons viz. Agrahyoni (October-November’12-S1) and Chaita (February-March’13-S2). The experimental rearing was conducted in a randomized block design and standard rearing techniques. Cocoons were harvested as per the schedule without any interruption. Observations on single cocoon weight, shell weight and Shell Ratio percentage (SR%) were carefully recorded. General and Specific Combining Ability (GCA and SCA) and their variations were calculated. Heterosis over both mid-parent (MP) and better-parent (BP) were calculated for all the 18 crosses in both the seasons by using the following equation: Heterosis over mid-parent (MP) = (F1 - MP)/MP x MP , Heterosis over better-parent (BP) =( F1 - BP)/BP x 100.  The combining ability analysis was based on the standard procedure. In the first step, analysis of variance for different seasons were estimated to test the significance of differences among the genotypes, including crosses and parents (treatment). The treatment SS was further partitioned into various components like parents, crosses and parent vs. crosses.

  Journal of Biological Sciences 15 (2): 92-97, 2015; ISSN 1727-3048
  DOI: 10.3923/jbs.2015.92.97
Funding Source:
1.   Budget:  
  

Results clearly indicated that the combinations BSR-BN (B1)×BSRB-BB1 and BSR-3×BSRB-BB2 for all the characters, followed by BSR-BN (M)×BSRB-BB1 and BSR-10×BSRB-BB2 for two characters in both the seasons exhibited encouraging results that may be released for further field trials. On satisfactory performance in the field, these combinations may be utilized for commercial cocoon production to increase the productivity of silk in Bangladesh.

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