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- Title
Assembly of root-associated bacteria communities: interactions between abiotic and biotic factors.
- Authors
Dean, Sarah L; Farrer, Emily C; Porras-Alfaro, Andrea; Suding, Katharine N; Sinsabaugh, Robert L
- Abstract
Nitrogen ( N) deposition in many areas of the world is over an order of magnitude greater than it would be in absence of human activity. We ask how abiotic ( N) and biotic (plant host and neighborhood) effects interact to influence root-associated bacterial ( RAB) community assembly. Using 454 pyrosequencing, we examined RAB communities from two dominant alpine tundra plants, G eum rossii and D eschampsia cespitosa, under control, N addition and D . cespitosa removal treatments, implemented in a factorial design. We hypothesized that host would have the strongest effect on RAB assembly, followed by N, then neighbor effects. The most dominant phyla were P roteobacteria (mostly G ammaproteobacteria), A ctinobacteria, B acteroidetes and A cidobacteria. We found RAB communities were host specific, with only 17% overlap in operational taxonomic units. Host effects on composition were over twice as strong as N effects. D . cespitosa RAB diversity declined with N, while G . rossii RAB did not. D . cespitosa removal did not influence G . rossii RAB community composition, but G . rossii RAB diversity declined with N only when D . cespitosa was absent. We conclude that RAB of both hosts are sensitive to N enrichment, and RAB response to N is influenced by host identity and plant neighborhood.
- Subjects
MICROBIOLOGY; PLANT roots; PROTEOBACTERIA; BIOTIC communities; ABIOTIC environment; NITROGEN in soils; PYROSEQUENCING; HOSTS (Biology)
- Publication
Environmental Microbiology Reports, 2015, Vol 7, Issue 1, p102
- ISSN
1758-2229
- Publication type
Article
- DOI
10.1111/1758-2229.12194