| Autor: |
Sharmila, K. K., Ashwath, S. K., Mahalingappa, K. C., Sabita, N., Qadri, S. M. H. |
| Předmět: |
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| Zdroj: |
Indian Journal of Sericulture; Jun2010, Vol. 49 Issue 1, p58-63, 6p |
| Abstrakt: |
The productive breeds and hybrids with high silk content and raw silk recovery developed recently by adopting conventional method of breeding fares well only during favourable seasons of the year. Hence, attempts were made to evolve robust breeds by adopting marker assisted selection utilizing digestive amylase as marker as it is associated with better digestibility resulting in higher survival. High activity amylase geries from the polyvoltine breeds, viz., Pure Mysore and Nistari were introgressed into the genetic background of productive Diveltine breeds, namely, CSR2 and CSR5 respectively through the strategy of amylase marker based selection in each generation followed by recurrent backcross breeding. Evaluation of the evolved lines and their hybrids indicated the superiority of GEN3 × GEN2 hybrid which performed better both as pure lines as well as hybrid. In order to evaluate the performance of this hybrid in the field, parents were reared and 71,020 GEN3 × GEN2 hybrid layings were prepared during 2001-06 and tested in different agroclimatic conditions of Karnataka, Tamil Nadu and Andhra pradesh. Evaluation studies indicated a consistent yield of 62 kg/100 dfls in favourable and adverse seasons. Frequency distribution of yield range has shown that 66 % of the total farmers have achieved cocoon yields of over 60 kg/100 dfls. The results indicated the suitability of this hybrid for rearing throughout the year even with marginal farmers under sub-optimal conditions of leaf quality and rearing management. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
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