trié(s) par (Pertinence décroissant(e), Titre croissant(e)) 

Effects of male sterility on reproductive traits in gynodioecious plants : a meta-analysis / Jacqui Shykoff in Oecologia, vol. 135 (Année 2003)

Public [article]  inOecologia > vol. 135 (Année 2003) . - pp. 1-9 Titre : Effects of male sterility on reproductive traits in gynodioecious plants : a meta-analysis Type de document : texte imprimé Auteurs : Jacqui Shykoff, Auteur ; Sergios-Orestis Kolokotronis, Auteur ; Carine Collin, Auteur ; Manuela López-Villavicencio, Auteur Année de publication : 2003 Article en page(s) : pp. 1-9 Langues : Anglais (eng) Mots-clés : plante gynodioïque  stérilité  pollen  graine  germination Résumé : "Female fecundity advantage in gynodioecious plants is required for the spread and maintenance of this reproductive system. However, not all reproductive characters show female advantage in all species. We used a meta-analysis to summarise differences between females and hermaphrodites reported from the literature for several reproductive traits. Further we tested three hypotheses, (1) that female plants of species with many ovules produce more seeds per fruit while those with few ovules produce heavier seeds, (2) that females are more pollen limited than hermaphrodites, and (3) that floral sexual size dimorphism is more pronounced in species with few ovules, either because female reproductive success is less limited by pollen availability in such species or because flowers with few ovules require a smaller floral structure to protect the carpels. Overall, females compared to hermaphrodites produced more but smaller flowers, had higher fruit set, higher total seed production, and produced heavier seeds that germinated better. Species with many versus few ovules differed in female advantage for flower size dimorphism, flower number, fruit set and total seed production. However seed size, seed set per fruit and seed germination differences between females and hermaphrodites did not differ significantly between species with few and many ovules. We also found no evidence for differential pollen limitation between females and hermaphrodites. Degree of floral sexual size dimorphism differed significantly between species with few and many ovules. Though pistillate flowers were generally smaller than those of hermaphrodites, species with many ovules showed less difference in flower size between the sexes, suggesting either that the protective role of the perianth constrains the evolution of sexual size dimorphism in species with many ovules or that selection for adequate pollination in species with many ovules impedes the reduction in flower size of females." (source : auteurs) Type de publication : périodique Référence biblio : Shykoff J., Kolokotronis S.-O., Collin C., López-Villavicencio M., 2003 - Effects of male sterility on reproductive traits in gynodioecious plants : a meta-analysis. Oecologia, 135 (1) : 1-9. ID PMB : 62682 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=62682 [article]

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