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"last-update": "2022-04-29T16:59:47",
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"study-abstract": "Plants host at the contact zone with soil a distinctive root-associated bacterial microbiota believed to function in plant nutrition and health. We investigated the diversity of the root microbiota within a phylogenetic framework of hosts: three Arabidopsis thaliana ecotypes along with its sister species Arabidopsis halleri and Arabidopsis lyrata as well as Cardamine hirsuta, which diverged from the former ~35 myr ago. We surveyed their microbiota under controlled environmental conditions and of A. thaliana and C. hirsuta in two natural habitats. Deep 16S rRNA gene profiling of root and corresponding soil samples identified a total of 237 quantifiable bacterial ribotypes, of which an average of 73 community members were enriched in roots. The composition of this root microbiota depends more on interactions with the environment than with host species. Inter-host species microbiota diversity is largely quantitative and is greater between the 3 Arabidopsis species than the 3 A. thaliana ecotypes. Host species-specific microbiota were identified at the levels of individual community members, taxonomic groups and whole root communities. Most of these signatures were observed in the phylogenetically distant C. hirsuta. However, the branching order of host phylogeny is incongruent with inter-species root microbiota diversity, indicating that host phylogenetic distance alone cannot explain root microbiota diversification. Our work reveals within 35 myr of host divergence a largely conserved and taxonomically narrow root microbiota, which comprises stable community members belonging to the Actinomycetales, Burkholderiales and Flavobacteriales.",
"study-name": "Bacterial microbiota in roots of Arabidopsis thaliana and relative Brassicaceae species",
"data-origination": "SUBMITTED"
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