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Leaf metagenome

ABSTRACT: Effects of differences in leaf chemistry on bacterial communities colonizing leaf litter in a freshwater stream

PROVIDER: PRJNA228909 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR1041590_1.fastq.gz	Fastqsanger.gz
	SRR1041590_2.fastq.gz	Fastqsanger.gz
	SRR1041840_1.fastq.gz	Fastqsanger.gz
	SRR1041840_2.fastq.gz	Fastqsanger.gz
	SRR1041632_1.fastq.gz	Fastqsanger.gz

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Project description:We tested whether home field advantage at inter- and intra-specific levels alters microbial carbon transformations, using a multi-factorial design with microcosms of freshwater submerged leaf litter from two species (Alder and Hemlock) exposed to 'home' or 'away' communities of microbes isolated from decomposing leaf litter, as well as controls with no microbial community added. For all 'home', 'away' and control conditions for each species we also had high or low oxygen treatments. Samples were taken at day 0, 154, 257 and 354 and extracted with solid phase columns and methanol to provide extracted metabolites.

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Project description:Differences between species promote stable coexistence in a resource-limited environment. These differences can result from interspecies competition leading to character shifts, a process referred to as character displacement. While character displacement is often interpreted as a consequence of genetically fixed trait differences between species, it can also be mediated by phenotypic plasticity in response to the presence of another species. Here, we test whether phenotypic plasticity leads to a shift in proteome allocation during co-occurrence of two bacterial species from the abundant, leaf-colonizing families Sphingomonadaceae and Rhizobiaceae in their natural habitat. Upon mono-colonizing of the phyllosphere, both species exhibit specific and shared protein functions indicating a niche overlap. During co-colonization, quantitative differences in the protein repertoire of both bacterial populations occur as a result of bacterial coexistence in planta. Specifically, the Sphingomonas strain produces enzymes for the metabolization of xylan, while the Rhizobium strain reprograms its metabolism to beta-oxidation of fatty acids fueled via the glyoxylate cycle and adapts its biotin acquisition. We demonstrate the conditional relevance of cross-species facilitation by mutagenesis leading to loss of fitness in competition in planta. Our results show that dynamic character displacement and niche facilitation mediated by phenotypic plasticity can contribute to species coexistence.

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