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Genetic differentiation induced by selection in an inbred population of the silkworm Bambyx mori, revelated by RAPD and ISSR marker systems

100%

Pradeep A. R., Chatterjee S. N., Nair C. V.

Journal of Applied Genetics

2005

tom 46

nr 3

291-298

Artificial selection has been widely utilized in breeding programmes concerning the commercially important silk-producing insect Bombyx mori. Selection increases the frequency of homozygotes and makes homozygous effects stronger. Molecular variation induced by selection in the inbred population of B. mori strain Nistari, was assessed in terms of genie differentiation by using a polymorphic profile generated by RAPD and ISSR marker systems. Artificial selection for longer larval duration (LLD) for 4 generations resulted in a significant prolongation of larval duration (F = 89.28; P = 5.14×10⁻⁷). The lines selected for shorter larval duration (SLD) were not significantly different from the control group. RAPD and ISSR primers generated polymorphic profiles when amplified with genomic DNA of individuals of LLD and SLD lines. Distinct markers specific to LLD individuals were observed from the 3rd generation and indicated selection-induced differentiation of allelic variants for longer larval duration. Both SLD and LLD were characterized by high gene diversity (h ≈ 0.197) and total heterozygosity (Ht ≥ 0.26), low homogeneity (χ² test, p < 0.005) as well as a large coefficient of gene differentiation (Gst ≥ 0.42) but low gene flow (Nm ≤ 0.42). Genetic distance was the highest (0.824) between 3rd generations of SLD and LLD. High heterozygosity and prolonged larval duration substituted for shorter larval duration (the traditional trait of fitness) in the Nistari LLD larvae.

Genetic evaluation of eri silkworm Samia cynthia ricini: ISSR loci specific to high and low altitude regimes and quantitative attributes

76%

Pradeep A. R., Awasthi A. K., Singh C. K., Anuradha H. J., Rao C. G. P., Vijayaprakash N. B.

Journal of Applied Genetics

2011

tom 52

nr 3

Genetic structure of populations is under constant pressure from varying geographical conditions that induce phenotypic plasticity in insects. Spatial distribution of 15 populations of Indian eri silkworm, Samia cynthia ricini originated at various altitudes of sub Himalayas based on Euclidean distance realized from yield attributes showed two population clusters irrespective of their place of origin and altitude. However, DNA amplification profile by inter SSR (ISSR) markers showed genetic variations among the populations depend on low and high altitudes. One ISSR locus each specific to high and low altitude population was identified. The locus from high altitude showed deviation from Hardy-Weinberg equilibrium but that from low altitude was in neutrality suggests that the high altitude loci could be under pressure from the altitudinal variations. In association with different yield traits, 18 loci were identified. Of which, three markers showed association with more than one trait indicative of pleiotropic influence. Stepwise addition of markers enhanced the correlation between markers and the associated trait pointed to polygenic influence. Association of markers with altitude and yield traits suggests an imperative relation of rare genetic loci with gene-environment interaction and phenotypic variability in S. c. ricini.

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Transcriptome analysis of Nosema assamensis infecting muga silkworms (Antheraea assamensis) reveals insights into candidate pathogenicity related genes and molecular pathways required for pathogenesis

76%

Jagadish A., Dubey H., Kamatchi I., Pradeep A. R., Subrahmanyam G., Mishra R. K., Ponnuvel K. M.

Annals of Parasitology

2021

tom 67

nr 4

Ograniczanie wyników

2 Journal of Applied Genetics

1 Annals of Parasitology

3 Pradeep A. R.

1 Anuradha H. J.

1 Awasthi A. K.

1 Chatterjee S. N.

1 Dubey H.

1 Jagadish A.

1 Kamatchi I.

1 Mishra R. K.

1 Nair C. V.

1 Ponnuvel K. M.

1 Rao C. G. P.

1 Singh C. K.

1 Subrahmanyam G.

1 Vijayaprakash N. B.

1 2021

1 2011

1 2005

Wyniki wyszukiwania

Genetic differentiation induced by selection in an inbred population of the silkworm Bambyx mori, revelated by RAPD and ISSR marker systems

Genetic evaluation of eri silkworm Samia cynthia ricini: ISSR loci specific to high and low altitude regimes and quantitative attributes

Transcriptome analysis of Nosema assamensis infecting muga silkworms (Antheraea assamensis) reveals insights into candidate pathogenicity related genes and molecular pathways required for pathogenesis