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Low selfing in a mass-flowering, endangered perennial, Eryngium alpinum L. (Apiaceae) / Myriam Gaudeul in American Journal of Botany, vol. 90, n°5 (Année 2003)

Public [article]  inAmerican Journal of Botany > vol. 90, n°5 (Année 2003) . - pp. 716-723 Titre : Low selfing in a mass-flowering, endangered perennial, Eryngium alpinum L. (Apiaceae) Auteurs : Myriam Gaudeul, Auteur ; Irène Till-Bottraud, Auteur Année de publication : 2003 Article en page(s) : pp. 716-723 Langues : Anglais (eng) Catégories : [Espèces (in biblio)] Apiaceae [Espèces (in biblio)] Eryngium alpinum [Thèmes] Conservation [Thèmes] Pollinisation, pollen, nectar [Thèmes] Reproduction Mots-clés : diversité génétique Résumé : "We investigated the reproductive ecology of an endangered alpine species, Eryngium alpinum L., to determine its selfing rate and to propose possible mechanisms that may shape its breeding system. Whereas pollinators' foraging behavior suggested a high potential for geitonogamy (70% of the flights occur within plants), microsatellite analyses of seed progenies demonstrated that plants are primarily outcrossing (outcrossing rate [tm] = 0.65, 0.96, and 1 in three populations). Given the relatively long pollen viability (at least 4-5 d) and the high number of simultaneously opened flowers on each plant, protandry is not sufficient to eliminate selfing. Second, controlled crosses demonstrated not only auto-fertility, but also partial self-incompatibility. Partial self-incompatibility is probably due to the competitive advantage of cross vs. self-pollen, and, together with protandry, could lead the species to selfing as a reproductive assurance. These results are encouraging for the maintenance of large populations. However, higher selfing was observed in a small population that could suffer inbreeding depression, as observed on experimentally selfed seeds. Thus, these populations should be carefully monitored. Finally, this study shows how molecular markers and field experiments may complement each other in our reaching a global understanding of mating patterns. " (source : auteurs) Type de publication : périodique Référence biblio : Gaudeul M., Till-Bottraud I., 2003 - Low selfing in a mass-flowering, endangered perennial, Eryngium alpinum L. (Apiaceae). American journal of botany, 90 (5) : 716-723. ID PMB : 72254 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=72254 [article]

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Reproductive Ecology of the Endangered Alpine Species Eryngium alpinum L. (Apiaceae): Phenology, Gene Dispersal and Reproductive Success / Myriam Gaudeul in Annals of Botany, vol. 93, n°6 (Année 2004)

Public [article]  inAnnals of Botany > vol. 93, n°6 (Année 2004) . - pp. 711-721 Titre : Reproductive Ecology of the Endangered Alpine Species Eryngium alpinum L. (Apiaceae): Phenology, Gene Dispersal and Reproductive Success Auteurs : Myriam Gaudeul, Auteur ; Irène Till-Bottraud, Auteur Année de publication : 2004 Article en page(s) : pp. 711-721 Langues : Anglais (eng) Catégories : [Espèces (in biblio)] Apiaceae [Espèces (in biblio)] Eryngium alpinum [Thèmes] Biologie de la conservation [Thèmes] Ecologie [Thèmes] Plante à forte valeur patrimoniale [Thèmes] Pollinisation, pollen, nectar [Thèmes] Reproduction Mots-clés : phénologie  suivi à long terme  génétique Résumé : "Eryngium alpinum (Apiaceae) is an endangered perennial, characteristic of the Alpine flora. Because the breeding system influences both demographic (reproductive success) and genetic (inbreeding depression, evolutionary potential) parameters that are crucial for population maintenance, the reproductive ecology of E. alpinum was investigated. Specifically, the aims of the study were (1) to determine the factors (resources and/or pollen) limiting plant fitness; and (2) to assess the potential for gene flow within a plant, within a patch of plants, and across a whole valley where the species is abundant. Field experiments were performed at two sites in the Fournel valley, France, over three consecutive years. Studies included a phenological survey, observations of pollinators (visitation rates and flight distances), dispersal of a fluorescent powder used as a pollen analogue, the use of seed traps, determination of the pollen/ovule ratio, and an experiment to test whether seed production is limited by pollen and/or by resources. E. alpinum is pollinated by generalist pollinators, visitation rates are very high and seed set is resource- rather than pollen-limited. The short flights of honeybees indicate a high potential for geitonogamy, and low pollen and seed dispersals suggest strong genetic structure over short distances. These results are interpreted in the light of previous molecular markers studies, which, in contrast, showed complete outcrossing and high genetic homogeneity. S. The study highlights the usefulness of adopting several complementary approaches to understanding the dynamic processes at work in natural populations, and the conservation implications for E. alpinum are emphasized. Although the studied populations do not seem threatened in the near future, long-term monitoring appears necessary to assess the impact of habitat fragmentation. Moreover, this study provides useful baseline data for future investigations in smaller and more isolated populations." (source : auteurs) Type de publication : périodique Référence biblio : Gaudeul M., Till-Bottraud I., 2004 - Reproductive Ecology of the Endangered Alpine Species Eryngium alpinum L. (Apiaceae): Phenology, Gene Dispersal and Reproductive Success. Annals of Botany, 93 (6) : 711-721. ID PMB : 72255 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=72255 [article]

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