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CBNPMP-Thématique > Systématique, génétique et amélioration des plantes > Amélioration des plantes, valorisation > Généralités en amélioration des plantes et valorisation
Généralités en amélioration des plantes et valorisation |
Documents disponibles dans cette catégorie (5)
Affiner la rechercheAnalysis of gene diversity in subdivided populations / Masatoshi Nei in Proceedings of the National Academy of Sciences of the United States of America, 70 (1973)
Titre : Analysis of gene diversity in subdivided populations Type de document : Imprimé Auteurs : Masatoshi Nei (1931-2023) Année de publication : 1973 Article en page(s) : 3321-3323 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Généralités en amélioration des plantes et valorisation
[CBNPMP-Thématique] Génétique (espèce)Résumé : A method is presented by which the gene diversity (heterozygosity) of a subdivided population can be analyzed into its components, i.e., the gene diversities within and between subpopulations. This method is applicable to any population without regard to the number of alleles per locus, the pattern of evolutionary forces such as mutation, selection, and migration, and the reproductive method of the organism used. Measures of the absolute and relative magnitudes of gene differentiation among subpopulations are also proposed. Lien pérenne : DOI : 10.1073/pnas.70.12.3321 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=141742
in Proceedings of the National Academy of Sciences of the United States of America > 70 (1973) . - 3321-3323Nei, Masatoshi (1931-2023) 1973 Analysis of gene diversity in subdivided populations. Proceedings of the National Academy of Sciences of the United States of America, 70: 3321-3323.Documents numériques
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Article (1973)URLLe chemin des plantes / Corinne Daillant-Losier (C 1996)
Titre : Le chemin des plantes Type de document : Imprimé Auteurs : Corinne Daillant-Losier, Auteur ; Alfred Morera (1949-....), Illustrateur ; François Pencrec'h, Illustrateur Editeur : Toulouse : Éditions Privat Année de publication : C 1996 Autre Editeur : CRDP Midi-Pyrénées Importance : 1 vol. (75 p.) Présentation : ill. en coul., couv. ill. en coul. Format : 29 cm ISBN/ISSN/EAN : 2-7089-4906-3 Prix : 80 FRF Langues : Français (fre) Catégories : [CBNPMP-Thématique] Généralités en amélioration des plantes et valorisation
[CBNPMP-Thématique] Ethno-botaniquePermalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=144150 Daillant-Losier, Corinne , C 1996. Le chemin des plantes. Éditions Privat, Toulouse. 1 vol. (75 pp.) : ill. en coul., couv. ill. en coul. ; 29 cmExemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 28172 M-1 Livre Réserve Bibliothèque Consultable
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 valorisationMots-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
in AoB plants > (2011) . - 13 p.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
article (2011)URL
Titre : Genetic Erosion : No longer just an agricultural issue Type de document : Imprimé Auteurs : Deborah L. Rogers Année de publication : 2004 Article en page(s) : 113-122 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Généralités en amélioration des plantes et valorisation
[CBNPMP-Thématique] Revégétalisation
[CBNPMP-Thématique] Diversité génétiqueRésumé : Genetic considerations pertaining to planting projects usually emphasize locally adapted source material. However, the amount of genetic diversity in the plant materials is important as well. Genetic erosion is the loss of genetic diversity—often magnified or accelerated by human activities. In native plant populations, genetic erosion results from habitat loss and fragmentation, but it also can result from a narrow genetic base in the original collections or by practices that reduce genetic diversity. Although species-specific guidelines are not available, managers can minimize the risk of genetic erosion by being familiar with the biology of the affected species (including breeding system, mode of reproduction, and pattern of genetic diversity). Narrowly based genetic collections should be avoided, providers of plant materials for revegetation projects should offer information on their collection methods, and nursery managers should endeavor to minimize diversity losses at all stages of nursery culture. Lien pérenne : DOI : 10.2979/NPJ.2004.5.2.112 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=148346
in Native Plants Journal > 5 (2) (2004) . - 113-122Rogers, Deborah L. 2004 Genetic Erosion : No longer just an agricultural issue. Native Plants Journal, 5(2): 113-122.Documents numériques
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Article (2004)URL
Titre : Genetic structure of the endangered perennial plant Eryngium alpinum (Apiaceae) in an Alpine valley Type de document : Électronique Auteurs : Myriam Gaudeul (1976-) ; Irène Till-Bottraud Année de publication : 2008 Article en page(s) : 667-677 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Généralités en amélioration des plantes et valorisation Mots-clés : Eryngium alpinum L. Résumé : We investigated the genetic structure of Eryngium alpinum (Apiaceae) in an Alpine valley where the plant occurs in patches of various sizes. In a conservation perspective, our goal was to determine whether the valley consists of one or several genetic units. Habitat fragmentation and previous observations of restricted pollen/seed dispersal suggested pronounced genetic structure, but gene dispersal often follows a leptokurtic distribution, which may lead to weak genetic structure. We used nine microsatellite loci and two nested sampling designs (50 x 50 m grid throughout the valley and 2 x 2 m grid in two 50 x 10 m quadrats). Within the overall valley, F-statistics and Bayesian approaches indicated high genetic homogeneity. This result might be explained by: (1) underestimation of long-distance pollen/seed dispersal by in situ experiments and (2) too recent fragmentation events to build up genetic structure. Spatial autocorrelation revealed isolation by distance on the overall valley but this pattern was much more pronounced in the 50 x 10 m quadrats sampled with a 2-m mesh. This was probably associated with limited primary seed dispersal, leading to the spatial clustering of half-sibs around maternal plants. We emphasize the interest of nested sampling designs and of combining several statistical tools. (C) 2008 The Linnean Society of London. Lien pérenne : DOI : 10.1111/j.1095-8312.2008.00958.x / HAL : halsde-00277918
Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=140695
in Biological Journal of the Linnean Society > 93 (2008) . - 667-677Gaudeul, Myriam (1976-), Till-Bottraud, Irène 2008 Genetic structure of the endangered perennial plant Eryngium alpinum (Apiaceae) in an Alpine valley. Biological Journal of the Linnean Society, 93: 667-677.Documents numériques
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article (2008)URL
