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Genetic divergence and allelic-specificity in relation to expression of voltinism in silkworm using ISSR and RAPD fingerprinting

Haghighi, M. T., Jagadeesh Kumar, T. S.
Russian journal of genetics 2017 v.53 no.2 pp. 267-274
Lepidoptera, alleles, breeding programs, genetic markers, genetic variation, microsatellite repeats, models, phylogeny, races, random amplified polymorphic DNA technique, silkworms
The silkworm B. mori is a multicellular organism revealing genetic resources which makes an ideal model for lepidoptera for the present investigation. With the objective of targeting distinctive markers for utilization in future breeding programmes, Bivoltine and Polyvoltine silkworm strains were used by inter-simple sequence repeats (ISSR) and random amplified polymorphic-DNA (RAPD) fingerprinting to detect their genetic versatility and volatility. Six ISSR primers generated 99 markers, of which 76.76% were found to be polymorphic with an average number of observed alleles (N ₐ) (1.86 ± 0.40), an effective number of alleles (N ₑ) (1.43 ± 0.30) as well as six RAPD primers that produced a total of 95 bands, developing 61.05% polymorphism with N ₐ (1.93 ± 0.51) and N ₑ (1.18 ± 0.30). The dendrogram produced by UPGMA analysis, based on Dice’s coefficient, clustered four races into two major groups which accurately segregated them according to their inheritance of voltinism. In this research, the ISSR markers were more accurate than the RAPD markers and ISSR also displayed better polymorphism. The outcome showed that the bivoltine strains exhibited higher allelic expressions with ISSR primers when compared to the polyvoltine strains. Despite exhibiting their unique race by certain DNA markers, most of the primers represented voltinism-specificity. Hence molecular marker amplification is a beneficial approach to reveal genetic divergence among closely related strains, and molecular characterization of phylogenetic relationships in addressing evolutionary evidences of individuals.