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Low selfing rate in an endangered perennial plant, Eryngium alpinum L. (Apiaceae) / Myriam Gaudeul in American Journal of Botany, 90 (10) (10/2003) 

Public Citation [article]  inAmerican Journal of Botany > 90 (10) (10/2003) . - 716-723 Titre : Low selfing rate in an endangered perennial plant, Eryngium alpinum L. (Apiaceae) Type de document : Numérique Auteurs : Myriam Gaudeul (1976-) ; Irène Till-Bottraud Année de publication : 2003 Article en page(s) : 716-723 Langues : Anglais (eng) Mots-clés : Eryngium alpinum L. 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. Identifiant : DOI : 10.3732/ajb.90.5.716 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=140707 Gaudeul, M., Till-Bottraud, I., 2003 . Low selfing rate in an endangered perennial plant, Eryngium alpinum L. (Apiaceae). American Journal of Botany, 90(10): 716-723.

Documents numériques

Article (2003) URL

Vegetative regeneration in invasive Reynoutria (Polygonaceae) taxa : the determinant of invasibility at the genotype level / Petr Pyšek in American Journal of Botany, 90 (10) (10/2003) 

Public Citation [article]  inAmerican Journal of Botany > 90 (10) (10/2003) . - 1487-1495 Titre : Vegetative regeneration in invasive Reynoutria (Polygonaceae) taxa : the determinant of invasibility at the genotype level Type de document : Numérique Auteurs : Petr Pyšek ; John H. Brock (1944-) ; Brohumil Mandak ; Vojtěch Jarošík (1958-2013) ; Irena Koukolikova ; Jan Pergl (1977-) ; Jan Stepanek Année de publication : 2003 Article en page(s) : 1487-1495 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Changement d'échelle, extension [CBNPMP-Thématique] Génétique (espèce) [CBNPMP-Thématique] Plantes subspontanées, naturalisées, envahissantes [CBNPMP-Thématique] Reproduction végétative Mots-clés : Reynoutria japonica Houtt.  Reynoutria sachalinensis (Friedrich Schmidt Petrop.) N  Reynoutria x-bohemica Chrtek & Chrtkova Résumé : Vegetative regeneration of individual genotypes of Asian Reynoutria taxa, which are invasive in the Czech Republic, was studied in R. sachalinensis (five genotypes), R. japonica (a single genotype present in the country), and their hybrid R. ×bohemica (nine genotypes). Identity of genotypes was confirmed by isozyme analysis. Ten rhizome segments of each genotype were planted in a randomized block design. After 30 d, the regeneration rate of each genotype was measured as the proportion of rhizomes that produced shoots. Emergence time and final mass of each shoot were recorded. The regeneration rate and final shoot mass were significantly affected by genotype in R. ×bohemica but not in R. sachalinensis. In R. ×bohemica, easily regenerating genotypes grew faster. Regeneration characteristics that crucially contribute to the fitness of these vegetatively spreading plants are closely related to each other. In genotypes with a low regeneration rate, early-emerging shoots produced more biomass, while in those with a high regeneration rate, shoot mass was independent of emergence time. Mean clone size recorded in the field was marginally significantly related to emergence time during regeneration; regeneration characteristics might thus affect the extent of R. ×bohemica invasion at a regional scale. Hybrids genetically intermediate between the parents regenerated better than those closely related to parents. Novel hybrid invasive genotypes may be produced by rare sexual reproduction, fixed by clonal growth, and present a previously unknown threat to native vegetation. Identifiant : DOI : 10.3732/ajb.90.10.1487 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=156358 Pyšek, P., Brock, J.H., Mandak, B., Jarošík, V., Koukolikova, I., Pergl, J., Stepanek, J., 2003 . Vegetative regeneration in invasive Reynoutria (Polygonaceae) taxa : the determinant of invasibility at the genotype level. American Journal of Botany, 90(10): 1487-1495.

Documents numériques

Article (2003 URL