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Abstract Detail

Symbioses: Plant, Animal, and Microbe Interactions

Yucel, Cagdas [1], Mykytczuk, Nadia [1], Ryser, Peter [1].

Differences among microbial rhizosphere communities are related to phylogenetic relationships among wetland plants.

Microbial rhizosphere communities of crop plants have been shown to be specific to species and even to genotypes of the plants. Species-specific relations have also been found among rhizosphere communities of plants in natural ecosystems. The question arises to what extent do such differences relate to the phylogeny, and to what extent to ecology, of the plant species. In this study we investigated variation among rhizosphere communities of ecologically similar, coexisting plant species with different degrees of phylogenetic relatedness. Bacterial and fungal rhizosphere microbial communities were compared among two congeneric species pairs within a monocotyledonous family, one species of a different monocot family and one eudicot species. The species co-exist in several wetlands of Northern Ontario, but have ecological ranges of their own. The six investigated species were: Chamaedaphne calyculata (Ericaceae), Glyceria canadensis (Poaceae), and the Cyperacean species Carex oligosperma, C. utriculata, Eriophorum vaginatum and E. virginicum. Plants were collected at 1-2 sites for each species and grown for two growing season in a common garden experiment with a common microbial inoculum pooled from soils collected from all the sites of plant collection. Rhizosphere microbial community composition was determined using 454-pyrosequencing techniques. Additionally, rhizosphere enzyme activities and mesocosm CO2 and CH4 production were measured. The bacterial communities show clear plant taxa related differentiation. The eudicot C. calyculata has bacterial rhizosphere communities clearly distinct from communities of the monocots, and within monocots the Poaceae G. canadensis has distinct rhizosphere communities compared to the species of Cyperaceae. Within Cyperaceae the two genera are distinct and the two Carex species show some differentiation from each other. Rhizosphere communities of the two Eriophorum species were quite similar. The differences at all taxonomic levels were less distinguished for the fungal communities, but also they showed some differentiation among plant species. Only C. calyculata mesocosms showed some differentiation with respect to rhizosphere enzyme activities and CH4 production. Considering the ecological importance of the rhizosphere microbiome, the close relationship found between composition of these communities and plant phylogeny raises the question about the relative importance of ecological and phylogenetic aspects for the variation of rhizosphere microbial communities across plant taxa.

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1 - Laurentian University, Biology, Ramsey Lake Road, Sudbury, ON, P3E 2C6, Canada

bacterial diversity
fungal diversity.

Presentation Type: Poster:Posters for Topics
Session: P
Location: Hall D/The Shaw Conference Centre
Date: Monday, July 27th, 2015
Time: 5:30 PM
Number: PSB009
Abstract ID:922
Candidate for Awards:None

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