Abstract
There is a concerted understanding of the ability of root exudates to influence the structure of rhizosphere microbial communities. However, our knowledge of the connection between plant development, root exudation and microbiome assemblage is limited. Here, we analyzed the structure of the rhizospheric bacterial community associated with Arabidopsis at four time points corresponding to distinct stages of plant development: seedling, vegetative, bolting and flowering. Overall, there were no significant differences in bacterial community structure, but we observed that the microbial community at the seedling stage was distinct from the other developmental time points. At a closer level, phylum such as Acidobacteria, Actinobacteria, Bacteroidetes, Cyanobacteria and specific genera within those phyla followed distinct patterns associated with plant development and root exudation. These results suggested that the plant can select a subset of microbes at different stages of development, presumably for specific functions. Accordingly, metatranscriptomics analysis of the rhizosphere microbiome revealed that 81 unique transcripts were significantly (P<0.05) expressed at different stages of plant development. For instance, genes involved in streptomycin synthesis were significantly induced at bolting and flowering stages, presumably for disease suppression. We surmise that plants secrete blends of compounds and specific phytochemicals in the root exudates that are differentially produced at distinct stages of development to help orchestrate rhizosphere microbiome assemblage.
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Work was supported by a grant from the National Science Foundation to JMV (MCB-0950857). JMC participated in the experimental design, performed the experiments, analyzed the data and wrote the manuscript. DVB participated in the experimental design, helped in data analyses and critical reading of the manuscript. JMV participated in the experimental design, coordinated the studies and wrote the manuscript.
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Chaparro, J., Badri, D. & Vivanco, J. Rhizosphere microbiome assemblage is affected by plant development. ISME J 8, 790–803 (2014). https://doi.org/10.1038/ismej.2013.196
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