Combining Ability of Diallel Crosses of Bivoltine Silkworm, Bombyx mori L.

  • Babu M. Ramesh (Andhra Pradesh State Sericulture Research and Development Institute (APSSRDI)) ;
  • Chandrashekharaiah Chandrashekharaiah (Andhra Pradesh State Sericulture Research and Development Institute (APSSRDI)) ;
  • Lakshmi H. (Andhra Pradesh State Sericulture Research and Development Institute (APSSRDI)) ;
  • Prasad J. (Andhra Pradesh State Sericulture Research and Development Institute (APSSRDI)) ;
  • Goel A. K. (Andhra Pradesh State Sericulture Research and Development Institute (APSSRDI))
  • Published : 2005.03.01

Abstract

General and specific combining ability effects of six bivoltine breeds of silkworm (Bombyx mori L.) were evaluated for six quantitative characters through diallel method wherein parents, $F_{1}s$ and reciprocals are involved. The breeds $APS_{11}\;and\;APS_{2}$ were found to be the best general combiners for most of the traits studied. The high estimates of specific combining ability (sca) variance (${\sigma}^{2}s$) compared to general combining ability (gca) variance (${\sigma}^{2}g$) indicated the predominant role of non-additive gene action in the control of all the characters. Positive sca effects for majority of the traits were expressed by the combinations $APS_{13}{\times}APS_6,\;APS_{13}{\times}APS_2,\;APS_{11}{\times}APS_6\;and\;APS_5{\times}APS_2$ out of 15 crosses. Among the 15 reciprocal crosses studied, the combination $APS_8{\times}APS_{13}$ showed positive reciprocal effects for all the six traits. With both the parents $APS_5\;and\;APS_2$ being good general combiners the hybrid $APS_5{\times}APS_2$ showing high sca effects is recommended for commercial use.

Keywords

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