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Fine-scale genetic structure and gene dispersal in Centaurea corymbosa (Asteraceae), I. Pattern of pollen dispersal / Olivier J. Hardy in Journal of Evolutionary Biology, vol. 17, n°4 (Année 2004)

Public [article]  inJournal of Evolutionary Biology > vol. 17, n°4 (Année 2004) Titre : Fine-scale genetic structure and gene dispersal in Centaurea corymbosa (Asteraceae), I. Pattern of pollen dispersal Auteurs : Olivier J. Hardy, Auteur ; Santiago C. González-Martínez, Auteur ; Hélène Fréville, Auteur ; G. Boquien, Auteur ; Agnès Mignot, Auteur ; Bruno Colas, Auteur ; Isabelle Olivieri (1957-2016), Auteur Année de publication : 2004 Langues : Anglais (eng) Catégories : [Espèces (in biblio)] Centaurea corymbosa [Thèmes] Plante à forte valeur patrimoniale [Thèmes] Pollinisation, pollen, nectar Mots-clés : dispersion pollinique Résumé : "Pollen dispersal was characterized within a population of the narrowly endemic perennial herb, Centaurea corymbosa, using exclusion-based and likelihood-based paternity analyses carried out on microsatellite data. Data were used to fit a model of pollen dispersal and to estimate the rates of pollen flow and mutation/genotyping error, by developing a new method. Selfing was rare (1.6%). Pollen dispersed isotropically around each flowering plant following a leptokurtic distribution, with 50% of mating pairs separated by less than 11 m, but 22% by more than 40 m. Estimates of pollen flow lacked precision (0-25%), partially because mutations and/or genotyping errors (0.03-1%) could also explain the occurrence of offspring without a compatible candidate father. However, the pollen pool that fertilized these offspring was little differentiated from the adults of the population whereas strongly differentiated from the other populations, suggesting that pollen flow rate among populations was low. Our results suggest that pollen dispersal is too extended to allow differentiation by local adaptation within a population. However, among populations, gene flow might be low enough for such processes to occur." (source : auteurs) Note de contenu : Cette article montre que la dispersion du pollen de Centaurea corymbosa est principalement locale mais peut atteindre des distances considérables, avec des implications pour la structure génétique et la différenciation des populations. Type de publication : périodique Référence biblio : Hardy O., González-Martínez S., Fréville H., Boquien G., Mignot A., Colas B., Olivieri I., 2004 - Fine-scale genetic structure and gene dispersal in Centaurea corymbosa (Asteraceae), I. Pattern of pollen dispersal. Journal of Evolutionary Biology, 17 (4) : . ID PMB : 72266 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=72266 [article]

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