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Cost of self-pollination in a self-incompatible plant, Polemonium viscosum / Candace Galen in American Journal of Botany, 76 (11) (1989) 

Public Citation [article]  inAmerican Journal of Botany > 76 (11) (1989) . - 1675-1680 Titre : Cost of self-pollination in a self-incompatible plant, Polemonium viscosum Type de document : Imprimé Auteurs : Candace Galen ; T. Gregory ; L.F. Galloway Année de publication : 1989 Article en page(s) : 1675-1680 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Pollinisateur Mots-clés : Polemonium sp. Résumé : Plants of Polemonium viscosum are strongly self-incompatible, yet have floral features that enforce spatial and temporal separation of pollen and stigma presentation. In this study, we address the widely held view that such barriers to selfing are maintained because they reduce interference by self pollen in performance of outcross grains. In the first year of the study we found that 24 hr precedence of self pollen on the stigma (24S), reduced outcross pollen germination by 32%, and seed set by 40% in flowers of P. viscosum. In the second year significant negative effects of self pollen on compatible pollen germination were seen when self pollen was applied four hours before (4S) or immediately prior (S×) to outcross pollen. Surprisingly, however, in the second year of study, seed set was not reduced with as much as 50% inhibition of compatible pollen germination. Results suggest that by interfering with normal functioning of outcross grains, incompatible self pollen can increase pollen limitation in P. viscosum. Reduction in seed production as a result of this phenomenon should select for displacement of pollen presentation from stigma receptivity. Identifiant : DOI : 10.1002/j.1537-2197.1989.tb15152.x Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=137804 Galen, Candace, Gregory, T., Galloway, L.F. 1989 Cost of self-pollination in a self-incompatible plant, Polemonium viscosum. American Journal of Botany, 76(11): 1675-1680.

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Costs of reproduction in Polemonium viscosum : phenotypic and genetic approaches / Candace Galen in Evolution, 47 (4) (1993) 

Public Citation [article]  inEvolution > 47 (4) (1993) . - 1073-1079 Titre : Costs of reproduction in Polemonium viscosum : phenotypic and genetic approaches Type de document : Imprimé Auteurs : Candace Galen Année de publication : 1993 Article en page(s) : 1073-1079 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Reproduction végétative Mots-clés : Polemonium sp. Résumé : I measured the effect of early reproduction on subsequent growth and survival in the alpine perennial wildflower, Polemonium viscosum. Measurements were made over 4 yr on 34 maternal sibships under natural conditions. A significant phenotypic cost of early reproduction characterized the study population. Plants that flowered after only one year's growth had twice as many leaves and 25% more shoots than nonflowering individuals of equal age. However, early flowering decreased leaf number by 18% in the subsequent year and survivorship by 20% after two years relative to changes in leaf number and survival of nonflowering plants. For such trade‐offs to shape the further evolution of reproductive schedules, flowering probability and those age‐specific components of plant size that represent the energetic currency for reproductive costs must be heritable. Although families showed significant heterogeneity in the probability of early flowering, most (62%) entirely failed to flower. Moreover, phenotypic variation in vegetative size components at ages 1 and 2 had little genetic basis. Only at ages 3 and 4, after vegetative and demographic costs of early reproduction had been incurred, did vegetative size components (leaf length and number, and shoot number) vary significantly among families. Results of this study provide little evidence of a genetically based trade‐off between early reproduction and subsequent survival in P. viscosum. Identifiant : DOI : 10.1111/j.1558-5646.1993.tb02136.x Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=137802 Galen, Candace 1993 Costs of reproduction in Polemonium viscosum : phenotypic and genetic approaches. Evolution, 47(4): 1073-1079.

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Why do flowers vary? The functional ecology of variation in flower size and form within natural plant populations / Candace Galen (1999) 

Public Citation est un tiré à part de 49 (8) - 1999 (BioScience) Titre : Why do flowers vary? The functional ecology of variation in flower size and form within natural plant populations Type de document : Tiré à part de revue Auteurs : Candace Galen Année de publication : 1999 Importance : 631-640 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Adaptation au milieu [CBNPMP-Thématique] Coadaptation, coévolution, symbiose (dissémination, pollinisation) [CBNPMP-Thématique] Evolution des plantes [CBNPMP-Thématique] Variabilité morphologique Mots-clés : Polemonium viscosum Identifiant : DOI : 10.2307/1313439 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=130325 Galen, Candace 1999 Why do flowers vary? The functional ecology of variation in flower size and form within natural plant populations. BioScience, 49(8) : 631-640.

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Consultable Article (1999) URL