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research
Ecological succession and stochastic variation in the assembly of Arabidopsis thaliana phyllosphere communities
Authors
Meghan E. Chafee
Emelia A. DeForce
+3 more
A. Murat Eren
Lois Maignien
Sheri L. Simmons
Publication date
1 January 2014
Publisher
'American Society for Microbiology'
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Abstract
© The Author(s), 2014. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in mBio 5 (2014): e00682-13, doi:10.1128/mBio.00682-13.Bacteria living on the aerial parts of plants (the phyllosphere) are globally abundant and ecologically significant communities and can have significant effects on their plant hosts. Despite their importance, little is known about the ecological processes that drive phyllosphere dynamics. Here, we describe the development of phyllosphere bacterial communities over time on the model plant Arabidopsis thaliana in a controlled greenhouse environment. We used a large number of replicate plants to identify repeatable dynamics in phyllosphere community assembly and reconstructed assembly history by measuring the composition of the airborne community immigrating to plant leaves. We used more than 260,000 sequences from the v5v6 hypervariable region of the 16S rRNA gene to characterize bacterial community structure on 32 plant and 21 air samples over 73 days. We observed strong, reproducible successional dynamics: phyllosphere communities initially mirrored airborne communities and subsequently converged to a distinct community composition. While the presence or absence of particular taxa in the phyllosphere was conserved across replicates, suggesting strong selection for community composition, the relative abundance of these taxa was highly variable and related to the spatial association of individual plants. Our results suggest that stochastic events in early colonization, coupled with dispersal limitation, generated alternate trajectories of bacterial community assembly within the context of deterministic selection for community membership.Funding was provided by the J. Unger Vetleson Foundation to S.L.S
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