GENETIC DIVERSITY AND POPULATION STRUCTURE OF THE SPECIES ARABIDOPSIS THALIANA (L.) HEY NH. ON VALAAM ISLAND
<p align="left">The genetic diversity and population structure of <em><span style="font-family: PragmaticaBook-Italic; font-size: xx-small;" lang="JA"><em><span style="font-family: PragmaticaBook-Italic; font-size: xx-small;" lang=&q...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Karelian Research Centre of the Russian Academy of Sciences
2016-11-01
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| Series: | Transactions of the Karelian Research Centre of the Russian Academy of Sciences |
| Subjects: | |
| Online Access: | http://journals.krc.karelia.ru/index.php/biology/article/view/430 |
| Summary: | <p align="left">The genetic diversity and population structure of <em><span style="font-family: PragmaticaBook-Italic; font-size: xx-small;" lang="JA"><em><span style="font-family: PragmaticaBook-Italic; font-size: xx-small;" lang="JA">Arabidopsis thaliana </span></em></span></em><span style="font-family: PragmaticaBook-Reg; font-size: xx-small;" lang="JA">on Valaam Island </span>was investigated. The purpose of the study was to detect the molecular genetic mechanisms and microevolutionary processes in insulate populations of <em><span style="font-family: PragmaticaBook-Italic; font-size: xx-small;" lang="JA"><em><span style="font-family: PragmaticaBook-Italic; font-size: xx-small;" lang="JA">A. thaliana </span></em></span></em><span style="font-family: PragmaticaBook-Reg; font-size: xx-small;" lang="JA">on an island </span>lying in the northern periphery of the species range. The variability at 95 RAPD-loci was evaluated in <em><span style="font-family: PragmaticaBook-Italic; font-size: xx-small;" lang="JA"><em><span style="font-family: PragmaticaBook-Italic; font-size: xx-small;" lang="JA">A. thaliana </span></em></span></em><span style="font-family: PragmaticaBook-Reg; font-size: xx-small;" lang="JA">from four localities on the island. A higher level of genetic diversity </span>was revealed (average value <em><span style="font-family: PragmaticaBook-Italic; font-size: xx-small;" lang="JA"><em><span style="font-family: PragmaticaBook-Italic; font-size: xx-small;" lang="JA">P</span></em></span></em><span style="font-family: PragmaticaBook-Reg; font-size: xx-small;" lang="JA"><span style="font-family: PragmaticaBook-Reg; font-size: xx-small;" lang="JA">99 % </span></span><span style="font-family: PragmaticaBook-Reg; font-size: xx-small;" lang="JA"><span style="font-family: PragmaticaBook-Reg; font-size: xx-small;" lang="JA">= 29.2 %; </span></span><em><span style="font-family: PragmaticaBook-Italic; font-size: xx-small;" lang="JA"><em><span style="font-family: PragmaticaBook-Italic; font-size: xx-small;" lang="JA">H</span></em></span></em><span style="font-family: PragmaticaBook-Reg; font-size: xx-small;" lang="JA"><span style="font-family: PragmaticaBook-Reg; font-size: xx-small;" lang="JA">exp</span></span><span style="font-family: PragmaticaBook-Reg; font-size: xx-small;" lang="JA">=0.092) in comparison with other </span>self-pollinators. The genetic variability of <em><span style="font-family: PragmaticaBook-Italic; font-size: xx-small;" lang="JA"><em><span style="font-family: PragmaticaBook-Italic; font-size: xx-small;" lang="JA">A. thaliana </span></em></span></em><span style="font-family: PragmaticaBook-Reg; font-size: xx-small;" lang="JA">on Valaam was however lower than </span>in previously investigated mainland populations of arabidopsis in Karelia. This fact is supposedly due to the island’s southerner location and milder climate, and may also depend on the low rate of gene migration from the mainland because of the species’ isolation on the island. The level of Nei’s genetic similarity of the studied groups of plants was high (average <em><span style="font-family: PragmaticaBook-Italic; font-size: xx-small;" lang="JA"><em><span style="font-family: PragmaticaBook-Italic; font-size: xx-small;" lang="JA">I</span></em></span></em><span style="font-family: PragmaticaBook-Reg; font-size: xx-small;" lang="JA"><span style="font-family: PragmaticaBook-Reg; font-size: xx-small;" lang="JA">N </span></span><span style="font-family: PragmaticaBook-Reg; font-size: xx-small;" lang="JA">= 0.949). Nei’s gene diversity statistics showed that 39.0 % of the total gene </span>diversity was explained by between-group variability (<em><span style="font-family: PragmaticaBook-Italic; font-size: xx-small;" lang="JA"><em><span style="font-family: PragmaticaBook-Italic; font-size: xx-small;" lang="JA">G</span></em></span></em><span style="font-family: PragmaticaBook-Reg; font-size: xx-small;" lang="JA"><span style="font-family: PragmaticaBook-Reg; font-size: xx-small;" lang="JA">ST</span></span><span style="font-family: PragmaticaBook-Reg; font-size: xx-small;" lang="JA">), which is quite low for inbred </span>species. The findings allow to suggest that the species <em><span style="font-family: PragmaticaBook-Italic; font-size: xx-small;" lang="JA"><em><span style="font-family: PragmaticaBook-Italic; font-size: xx-small;" lang="JA">A. thaliana </span></em></span></em><span style="font-family: PragmaticaBook-Reg; font-size: xx-small;" lang="JA">on Valaam is one but </span>segregated population where subpopulations are connected to one another by migratory interactions. This population structure counteracts inbreeding, which happens in isolated populations of limited size, and contributes to the preservation of genetic diversity, which is essential for adaptation and survival of populations.</p><p align="left"> </p><p align="left"> </p><p align="left"> </p><p align="left"> </p><p align="left"> </p><p> </p> |
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| ISSN: | 1997-3217 2312-4504 |