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Analysis of Genetic Variation in Natural Populations of Medicago truncatula of Southern Tunisian Ecological Areas, Using Morphological Traits and SSR Markers

Analysis of Genetic Variation in Natural Populations of Medicago truncatula of Southern Tunisian... We used 19 quantitative traits and 14 microsatellite markers (SSRs) to analyze the genetic variation in four natural populations of the model legume Medicago truncatula sampled in southern Tunisia. The greatest genetic variation of quantitative traits and molecular markers occurred within populations (>71%). In contrast to quantitative population differentiation (Q ST  = 0.09), a high level of molecular differentiation (F ST  = 0.23) was found among populations. The majority of quantitative traits exhibited Q ST values significantly less than F ST values, suggesting that selection may be acting to suppress differentiation for these traits. There was no significant correlation between genetic variation of quantitative traits and molecular markers within populations. On the other hand, significant correlations were found between measured quantitative characters and the site-of-origin environmental factors. The eco-geographical factors with the greatest influence on the variation of measured traits among populations were altitude, followed by soil texture, assimilated phosphorus (P2O5) and organic matter. Nevertheless, there were no consistent patterns of associations between gene diversity (He) and eco-geographical factors. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Tropical Plant Biology Springer Journals

Analysis of Genetic Variation in Natural Populations of Medicago truncatula of Southern Tunisian Ecological Areas, Using Morphological Traits and SSR Markers

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References (64)

Publisher
Springer Journals
Copyright
Copyright © 2009 by Springer Science + Business Media, LLC
Subject
Life Sciences; Transgenics; Plant Ecology; Plant Breeding/Biotechnology; Plant Genetics & Genomics; Plant Sciences
ISSN
1935-9756
eISSN
1935-9764
DOI
10.1007/s12042-009-9034-5
Publisher site
See Article on Publisher Site

Abstract

We used 19 quantitative traits and 14 microsatellite markers (SSRs) to analyze the genetic variation in four natural populations of the model legume Medicago truncatula sampled in southern Tunisia. The greatest genetic variation of quantitative traits and molecular markers occurred within populations (>71%). In contrast to quantitative population differentiation (Q ST  = 0.09), a high level of molecular differentiation (F ST  = 0.23) was found among populations. The majority of quantitative traits exhibited Q ST values significantly less than F ST values, suggesting that selection may be acting to suppress differentiation for these traits. There was no significant correlation between genetic variation of quantitative traits and molecular markers within populations. On the other hand, significant correlations were found between measured quantitative characters and the site-of-origin environmental factors. The eco-geographical factors with the greatest influence on the variation of measured traits among populations were altitude, followed by soil texture, assimilated phosphorus (P2O5) and organic matter. Nevertheless, there were no consistent patterns of associations between gene diversity (He) and eco-geographical factors.

Journal

Tropical Plant BiologySpringer Journals

Published: Sep 3, 2009

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