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Variation at a chloroplast minisatellite locus reveals the signature of habitat fragmentation and genetic bottlenecks in the rare orchid Anacamptis palustris (Orchidaceae) / Salvatore Cozzolino in American Journal of Botany, vol. 90, n°12 (Année 2003)  

Public [article]  inAmerican Journal of Botany > vol. 90, n°12 (Année 2003) . - pp. 1681-1687 Titre : Variation at a chloroplast minisatellite locus reveals the signature of habitat fragmentation and genetic bottlenecks in the rare orchid Anacamptis palustris (Orchidaceae) Auteurs : Salvatore Cozzolino, Auteur ; Maria E. Noce, Auteur ; Aldo Musacchio, Auteur ; Alex Widmer, Auteur Année de publication : 2003 Article en page(s) : pp. 1681-1687 Langues : Anglais (eng) Catégories : [Espèces (in biblio)] Anacamptis palustris [Espèces (in biblio)] Orchis palustris [Thèmes] Bassin méditerranéen [Thèmes] Conservation Mots-clés : diversité génétique Résumé : "Geoclimatic changes during the Oligocene and more recent anthropogenic influences have shaped the current distribution and population structure of Mediterranean plant species. Anacamptis palustris (Orchidaceae) is a typical member of coastal wetlands, which have become increasingly fragmented and isolated. As a consequence, this orchid has become rare in the recent past. Length variation at a chloroplast minisatellite locus was used to estimate genetic variation within and between the largest extant populations of A. palustris. Genetic diversity was positively correlated with population size. Estimation of observed and expected gene diversity and analyses of haplotype number and haplotype frequency distributions provided evidence for population bottlenecks in the history of small populations. Comparison with an earlier study suggests that nuclear allozyme diversity was most likely lost during the Oligocene and could not recover subsequently due to low mutation rates, whereas genetic variation was restored at the highly variable chloroplast minisatellite locus. Population bottlenecks indicated by cpDNA variation occurred most likely as a consequence of more recent anthropogenic changes. The comparison of molecular markers with different levels of polymorphism provided valuable insights into the processes shaping genetic diversity and population structure in this rare orchid." (source : auteurs) Note de contenu : Cet article traite de l'impact des changements géoclimatiques survenus durant l'Oligocène ainsi que des influences anthropiques récentes sur la distribution actuelle et la structure des populations des espèces végétales méditerranéennes, en se concentrant sur Anacamptis palustris (Orchidaceae). Les variations génétiques observées révèlent des goulots d'étranglement et les efforts de conservation pourraient bénéficier de ces informations pour protéger et restaurer les populations de cette espèce rare. Type de publication : périodique Référence biblio : Cozzolino S., Noce M., Musacchio A., Widmer A., 2003 - Variation at a chloroplast minisatellite locus reveals the signature of habitat fragmentation and genetic bottlenecks in the rare orchid Anacamptis palustris (Orchidaceae). American Journal of Botany, 90 (12) : 1681-1687. ID PMB : 71105 DOI : 10.3732/ajb.90.12.1681 En ligne : https://bsapubs.onlinelibrary.wiley.com/doi/10.3732/ajb.90.12.1681 Format de la ressource électronique : document Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=71105 [article]

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