Evaluation and identification of promising multivoltine germplasm accessions using sub ordinate function method
N Balachandran, M Muthulakshmi, CK Kamble, Gargi
Central Sericultural Germplasm Resources Centre, Hosur is conserving and in possession of 81 multivoltine silkworm genetic resources presently which comprises 71 indigenous and 10 exotic origins. India being a country of tropical climate majority of the silk produced is multivoltine when compared with the temperate bivoltine silk produced in the sericulturally advanced country like China. Hence it becomes a necessity to make continuous efforts to breed for hardy and productive bivoltine silkworm breeds which will withstand the tropical climates prevailing in the Indian sub continent. Though there has been substantial improvement in the bivoltine silk produced in the country over the years, still majority of the silk produced are of multivoltine type, but the concept of Improved Cross Breeds (ICBs) have come into force where in the superior multivoltine breeds are developed and crossed with bivoltine breeds yielding silk which will match the international quality standards of 2A - 4A grade silk. To meet this requirement there is need for diverse parental breeds which can contribute as breeding resource materials in the development of ICBs so that a variety of breeds could be evolved which can contribute and improve the silk production. The breeders look for thoroughly evaluated and proven and stable breeds which can contribute to their resources base. CSGRC, Hosur with such a large and diverse collection of silkworm germplasm could be an important nodal centre in contributing to the needs of the breeders by providing parental materials for breeding towards achieving higher productivity and quality silk. Therefore an attempt has been made to evaluate and short list 73 potential multivoltine silkworm germplasm accessions using one of the proven evaluation technique of sub ordinate function method which is a handy tool in short listing germplasm and for selection of multiple traits. Potential accessions performing better over different seasons and better performing ones in all environments have been identified and recommended for the silkworm breeders to use them as resources materials.