Analysis of phenotypic diversity and protein polymorphism in some silkworm breeds of Bombyx mori L.

Abstract :

The assessment of genetic variation is a major aspect in silkworm improvement programmes. It distinguishes different genotypes for designing the breeding programmes and population-genetic analysis. It also estimates the amount of variation within genotypes and between genotypes for predicting potential genetic gain in a breeding programme. Variations in three qualitative traits and nine quantitative traits along with protein polymorphism were studied in ten silkworm genotypes. The results showed significant variation (P < 0.05) in the quantitative traits of silkworm genotypes studied. Cluster analysis based on phenotypic variation revealed three clusters separating high, moderate and low silk producers according to the silk producing ability of silkworms. The results of Principle Co-ordinate analysis was in agreement with the dendrogram. Protein profiling divided ten silkworm genotypes into two clusters. The dendrogram deduced from phenotypic data clearly indicates the dominant role of environment on quantitative traits. However, expression of quantitative traits depends on the genotypes and their place of origin. The phenotypic data depicted substantiate amount of diversity among the silkworm genotypes and hence, these breeds can be utilized for improving the silk yielding traits

Keyword :

Genetic diversity, Quantitative traits, Qualitative traits, Protein polymorphism

Author(s) : Moorthy, S. M., Chandrakanth, N.
Downloads : 1393
Published Issue : 2015 Vol. 10 Number 2

2015 Vol. 10 Number 2