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Competitive interactions are mediated in a sex-specific manner by arbuscular mycorrhiza in Antennaria dioica / Sandra Varga in Plant biology, vol. 19, n°2 (Mars 2017)
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Titre : Competitive interactions are mediated in a sex-specific manner by arbuscular mycorrhiza in Antennaria dioica Type de document : Livre Auteurs : Sandra Varga, Auteur ; Rocio Vega-Frutis, Auteur ; Minna-Maarit Kytšviita, Auteur Année de publication : 2017 Article en page(s) : pp. 217-226 Langues : Anglais Mots-clés : Hieracium pilosella Competition dioecy plant-plant interactions sexual dimorphism Résumé : "Plants usually interact with other plants, and the outcome of such interaction ranges from facilitation to competition depending on the identity of the plants, including their sexual expression. Arbuscular mycorrhizal (AM) fungi have been shown to modify competitive interactions in plants. However, few studies have evaluated how AM fungi influence plant intraspecific and interspecific interactions in dioecious species.
The competitive abilities of female and male plants of Antennaria dioica were examined in a greenhouse experiment. Females and males were grown in the following competitive settings: (i) without competition, (ii) with intrasexual competition, (iii) with intersexual competition, and (iv) with interspecific competition by Hieracium pilosella – a plant with similar characteristics to A. dioica. Half of the pots were grown with Claroideoglomus claroideum, an AM fungus isolated from the same habitat as the plant material. We evaluated plant survival, growth, flowering phenology, and production of AM fungal structures.
Plant survival was unaffected by competition or AM fungi. Competition and the presence of AM fungi reduced plant biomass. However, the sexes responded differently to the interaction between fungal and competition treatments. Both intra‐ and interspecific competition results were sex‐specific, and in general, female performance was reduced by AM colonization. Plant competition or sex did not affect the intraradical structures, extraradical hyphae, or spore production of the AM fungus.
These findings suggest that plant sexual differences affect fundamental processes such as competitive ability and symbiotic relationships with AM fungi."Type de publication : périodique Référence biblio : Varga S., Vega-Frutis R., Kytšviita M.-M., 2017 - Competitive interactions are mediated in a sex-specific manner by arbuscular mycorrhiza in Antennaria dioica. Plant biology, 19 (2) : 217-226. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=66295
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