Portail documentaire

Conservation genetics of the rare Pyreneo-Cantabrian endemic Aster pyrenaeus (Asteraceae) / Nathalie Escaravage in AoB plants, (2011) 

Public Citation [article]  inAoB plants > (2011) . - 13 p. Titre : Conservation genetics of the rare Pyreneo-Cantabrian endemic Aster pyrenaeus (Asteraceae) Type de document : Électronique Auteurs : Nathalie Escaravage ; Jocelyne Cambecèdes ; Gérard Largier ; André Pornon (1943-) Année de publication : 2011 Article en page(s) : 13 p. Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Conservation et gestion des espèces [CBNPMP-Thématique] Généralités en amélioration des plantes et valorisation Mots-clés : Aster pyrenaeus Desf. ex DC., 1805 Résumé : Background and aims Aster pyrenaeus (Asteraceae) is an endangered species, endemic to the Pyrenees and Cantabrian Mountain ranges (Spain). For its long-term persistence, this taxon needs an appropriate conservation strategy to be implemented. In this context, we studied the genetic structure over the entire geographical range of the species and then inferred the genetic relationships between populations. Methodology Molecular diversity was analysed for 290 individuals from 12 populations in the Pyrenees and the Cantabrian Mountains using inter simple sequence repeats (ISSRs). Bayesian-based analysis was applied to examine population structure. Principal results Analysis of genetic similarity and diversity, based on 87 polymorphic ISSR markers, suggests that despite being small and isolated, populations have an intermediate genetic diversity level (P % = 52.8 %, HE = 0.21 ± 0.01, genetic similarity between individuals = 49.6 %). Genetic variation was mainly found within populations (80–84 %), independently of mountain ranges, whereas 16–18 % was found between populations and <5 % between mountain ranges. Analyses of molecular variance indicated that population differentiation was highly significant. However, no significant correlation was found between the genetic and geographical distances among populations (Rs = 0.359, P = 0.140). Geographical structure based on assignment tests identified five different gene pools that were independent of any particular structure in the landscape. Conclusions The results suggest that population isolation is probably relatively recent, and that the outbreeding behaviour of the species maintains a high within-population genetic diversity. We assume that some long-distance dispersal, even among topographically remote populations, may be determinant for the pattern of genetic variation found in populations. Based on these findings, strategies are proposed for genetic conservation and management of the species. Lien pérenne : DOI : 10.1093/aobpla/plr029 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=141753 Escaravage, Nathalie, Cambecèdes, Jocelyne, Largier, Gérard, Pornon, André (1943-) 2011 Conservation genetics of the rare Pyreneo-Cantabrian endemic Aster pyrenaeus (Asteraceae). AoB plants: 13 p..

Documents numériques

Consultable article (2011) URL

Dynamics of genotypic structure in clonal Rhododendron ferrugineum (Ericaceae) populations / André Pornon (2000)

Public Citation est un tiré à part de 9 - 2000 (Molecular ecology) Titre : Dynamics of genotypic structure in clonal Rhododendron ferrugineum (Ericaceae) populations Type de document : Tiré à part de revue Auteurs : André Pornon (1943-) ; Nathalie Escaravage ; P. Thomas ; Pierre Taberlet Année de publication : 2000 Importance : 1099-1111 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Forme de vie et structure de la population végétale [CBNPMP-Thématique] Génétique et écologie (dynamique, démographique, sélection) [CBNPMP-Thématique] Système de reproduction [CBNPMP-Thématique] Variabilité, analyse de l'ADN, polymorphisme Mots-clés : Rhododendron ferrugineum L. Résumé : Two populations of Rhododendron ferrugineum growing at subalpine level in the Pyrenees (France) were studied in two sites (Bethmale and Mourtis). Identification and delimitation of genets were inferred from amplified fragment length polymorphism (AFLP) markers, along a closure gradient (from meadow to more closed heath) in each site. Surface and age of genets, genotypic diversity (Simpson's index D), 'proportion distinguishable' genotypes and genetic relationships between genets were then estimated. Amplification of the 312 DNA samples with three selective primer pairs gave a mean of 98 detectable peaks (i.e. bands) per sample, with size ranging from 60 to 300 bp. In total 60% (Bethmale) and 70% (Mourtis) of the peaks were polymorphic, and a total of 31 and 23 multilocus genotypes were identified, in Bethmale and Mourtis, respectively. We inferred that pioneer genotypes began arriving 110 years ago mainly over a 40-year period in the Mourtis meadow and began about 130 years ago over a 100-year period in the Bethmale meadow After this pioneer stage, populations extended vegetatively. Two different patterns of genotypic dynamics can be identified. At Bethmale, population closure could have led to a dramatic loss of genets and to the selection of highly genetically related genotypes. In contrast, at Mourtis, genotypic diversity and genet density did not change fundamentally along the closure gradient. However the range of genetic diversity diminished from the open to the closed situation, suggesting that thinning could have occurred in the past. Lien pérenne : DOI : 10.1046/j.1365-294x.2000.00976.x Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=130586 Pornon, André (1943-), Escaravage, Nathalie, Thomas, P., Taberlet, Pierre 2000 Dynamics of genotypic structure in clonal Rhododendron ferrugineum (Ericaceae) populations. Molecular ecology, 9 : 1099-1111.

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
9392	Pornon A.	Tiré à part	Centre de documentation	Tirés à part	Consultable

Etude de la variabiblité génétique des populations d'Aster des Pyrénées (Aster pyrenaeus DC.) à l'aide de marqueurs A.F.L.P : rapport intermédiaire / Nathalie Escaravage (2003)

Public Citation Titre : Etude de la variabiblité génétique des populations d'Aster des Pyrénées (Aster pyrenaeus DC.) à l'aide de marqueurs A.F.L.P : rapport intermédiaire Type de document : Imprimé Auteurs : Nathalie Escaravage ; André Pornon (1943-) ; Conservatoire botanique pyrénéen ; Elisa Chassang ; Evolution et diversité biologique (Toulouse) ; Centre national de la recherche scientifique (CNRS) (France) ; Union européenne Année de publication : 2003 Importance : p. non paginé Langues : Français (fre) Catégories : [CBNPMP-Thématique] Variabilité, analyse de l'ADN, polymorphisme [CBNPMP-Thématique] Génétique et écologie (dynamique, démographique, sélection) Mots-clés : Aster pyrenaeus DC. Note de contenu : Travaux réalisés dans le cadre de l'étude du plan de restauration national de l'Aster des Pyrénées Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=78354 Escaravage, Nathalie, Pornon, André (1943-), Conservatoire botanique pyrénéen, Chassang, Elisa, Evolution et diversité biologique (Toulouse), Centre national de la recherche scientifique (CNRS) (France), Union européenne , 2003. Etude de la variabiblité génétique des populations d'Aster des Pyrénées (Aster pyrenaeus DC.) à l'aide de marqueurs A.F.L.P : rapport intermédiaire. , . p. non paginé