[en] Interactions between arbuscular mycorrhizal fungal (AMF) species cocolonizing the same host plant are still little understood in spite of major ecological significance of mycorrhizal symbiosis and widespread occurrence of these fungi in communities rather than alone. Furthermore, shifting the composition of AMF communities has demonstrated consequences for the provision of symbiotic benefits to the host as well as for the qualities of ecosystem services. Therefore, here we addressed the nature and strength of interactions between three different AMF species in all possible two-species combinations on a gradient of inoculation densities. Fungal communities were established in pots with Medicago truncatula plants, and their composition was assessed with taxon-specific real-time PCR markers. Nature of interactions between the fungi was varying from competition to facilitation and was influenced by both the identity and relative abundance of the coinoculated fungi. Plants coinoculated with Claroideoglomus and Rhizophagus grew bigger and contained more phosphorus than with any of these two fungi separately, although these fungi obviously competed for root colonization. On the other hand, plants coinoculated with Gigaspora and Rhizophagus, which facilitated each other's root colonization, grew smaller than with any of these fungi separately. Our results point to as yet little understood complexity of interactions in plant-associated symbiotic fungal communities, which, depending on their composition, can induce significant changes in plant host growth and/or phosphorus acquisition in either direction.
Thonar, Cécile ; Université de Liège - ULiège > Département GxABT > Plant Sciences ; Institute of Agricultural Sciences, ETH Zurich, Eschikon 33, 8315, Lindau, Switzerland, Research Institute for Organic Agriculture (FiBL), Ackerstrasse, 5070, Frick, Switzerland
Frossard, Emmanuel; Institute of Agricultural Sciences, ETH Zurich, 8315 Lindau, Switzerland
Smilauer, Petr; Faculty of Science, University of South Bohemia, 37005 České Budějovice, Czech Republic
Jansa, Jan; Institute of Agricultural Sciences, ETH Zurich, 8315 Lindau, Switzerland ; Institute of Microbiology, Academy of Sciences of the Czech Republic, 14220 Praha 4, Czech Republic
Language :
English
Title :
Competition and facilitation in synthetic communities of arbuscular mycorrhizal fungi.
Czech Science Foundation CAS - Czech Academy of Sciences ETH Zürich - Swiss Federal Institute of Technology in Zurich
Funding text :
Financial support by the ETH Zurich
(project no. TH 14/05-3) is gratefully acknowledged. JJ was further
supported by Fellowship J.E. Purkyn e, Czech Science Foundation
(P504121665), Ministry of Education, Youth and Sports
(LK11224) and the long-term development programme RVO
61388971. PS was supported by the project GAJU 04–142/2010/
P. Constructive criticism by Dirk Redecker and five anonymous
reviewers on earlier versions of this paper is highly appreciated
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