Genetic evaluation of eri silkworm <Emphasis Type="Italic">Samia cynthia ricini</Emphasis>: ISSR loci specific to high and low altitude regimes and quantitative attributes |
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Authors: | Appukuttannair R Pradeep Aravind K Awasthi Choba K Singh H Jingade Anuradha C Guruprasad P Rao N B Vijayaprakash |
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Institution: | Seribiotech Research Laboratory, CSB-Kodathi-Campus, Bangalore, Karnataka, India. arpradeep23@rediffmail.com |
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Abstract: | 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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