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The Rhizosphere Selects for Particular Groups of Acidobacteria and Verrucomicrobia

Journal Article · · PLoS ONE
 [1];  [2];  [3];  [4];  [2]
  1. Wageningen University (Netherlands); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); DOE/OSTI
  2. Wageningen University (Netherlands)
  3. Université Libre de Bruxelles (Belgium)
  4. Groningen University (Netherlands)
There is a lack in our current understanding on the putative interactions of species of the phyla of Acidobacteria and Verrucomicrobia with plants. Moreover, progress in this area is seriously hampered by the recalcitrance of members of these phyla to grow as pure cultures. The purpose of this study was to investigate whether particular members of Acidobacteria and Verrucomicrobia are avid colonizers of the rhizosphere. Based on previous work, rhizosphere competence was demonstrated for the Verrucomicrobia subdivision 1 groups of Luteolibacter and Candidatus genus Rhizospheria and it was hypothesized that the rhizosphere is a common habitat for Acidobacteria subdivision 8 (class Holophagae). We assessed the population densities of Bacteria, Verrucomicrobia subdivision 1 groups Luteolibacter and Candidatus genus Rhizospheria and Acidobacteria subdivisions 1, 3, 4, 6 and Holophagae in bulk soil and in the rhizospheres of grass, potato and leek in the same field at different points in time using real-time quantitative PCR. Primers of all seven verrucomicrobial, acidobacterial and holophagal PCR systems were based on 16S rRNA gene sequences of cultivable representatives of the different groups. Luteolibacter, Candidatus genus Rhizospheria, subdivision 6 acidobacteria and Holophaga showed preferences for one or more rhizospheres. In particular, the Holophaga 16S rRNA gene number were more abundant in the leek rhizosphere than in bulk soil and the rhizospheres of grass and potato. Attraction to, and colonization of, leek roots by Holophagae strain CHC25 was further shown in an experimental microcosm set-up. In the light of this remarkable capacity, we propose to coin strain CHC25 Candidatus Porrumbacterium oxyphilus (class Holophagae, Phylum Acidobacteria), the first cultured representative with rhizosphere competence.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); Netherlands Genomic Initiative (NGI): Dutch Ministry of Agriculture
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1627665
Journal Information:
PLoS ONE, Journal Name: PLoS ONE Journal Issue: 12 Vol. 8; ISSN 1932-6203
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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Potential of a 16S rRNA-Based Taxonomic Microarray for Analyzing the Rhizosphere Effects of Maize on Agrobacterium spp. and Bacterial Communities journal June 2006
Recovery of As-Yet-Uncultured Soil Acidobacteria on Dilute Solid Media journal September 2011
Genomic and Physiological Characterization of the Verrucomicrobia Isolate Diplosphaera colitermitum gen. nov., sp. nov., Reveals Microaerophily and Nitrogen Fixation Genes journal December 2011
Profiling of complex microbial populations by denaturing gradient gel electrophoresis analysis of polymerase chain reaction-amplified genes coding for 16S rRNA. journal January 1993
Diversity and Seasonal Fluctuations of the Dominant Members of the Bacterial Soil Community in a Wheat Field as Determined by Cultivation and Molecular Methods journal May 2001
Comparison of Soil Bacterial Communities in Rhizospheres of Three Plant Species and the Interspaces in an Arid Grassland journal April 2002
Improved Culturability of Soil Bacteria and Isolation in Pure Culture of Novel Members of the Divisions Acidobacteria, Actinobacteria, Proteobacteria, and Verrucomicrobia journal May 2002
Laboratory Cultivation of Widespread and Previously Uncultured Soil Bacteria journal December 2003
Bacterial Communities Associated with Flowering Plants of the Ni Hyperaccumulator Thlaspi goesingense journal May 2004
Detection and Cultivation of Soil Verrucomicrobia journal December 2005
Assessment of Soil Microbial Community Structure by Use of Taxon-Specific Quantitative PCR Assays journal July 2005
Identifying the Dominant Soil Bacterial Taxa in Libraries of 16S rRNA and 16S rRNA Genes journal March 2006
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Cited By (15)

Acidobacteria strains from subdivision 1 act as plant growth-promoting bacteria journal June 2016
Verrucomicrobial community structure and abundance as indicators for changes in chemical factors linked to soil fertility journal July 2015
Trichoderma harzianum MTCC 5179 impacts the population and functional dynamics of microbial community in the rhizosphere of black pepper ( Piper nigrum L.) journal July 2018
Selection on soil microbiomes reveals reproducible impacts on plant function journal October 2014
Microbiome definition re-visited: old concepts and new challenges journal June 2020
Comparative Analysis of Prokaryotic Communities Associated with Organic and Conventional Farming Systems journal December 2015
The Effect of Root Exudate 7,4′-Dihydroxyflavone and Naringenin on Soil Bacterial Community Structure journal January 2016
The Ecology of Acidobacteria: Moving beyond Genes and Genomes journal May 2016
Bacterial Abilities and Adaptation Toward the Rhizosphere Colonization journal August 2016
Microbial Taxa Distribution Is Associated with Ecological Trophic Cascades along an Elevation Gradient journal October 2017
The Invasive Brazilian Pepper Tree (Schinus terebinthifolius) Is Colonized by a Root Microbiome Enriched With Alphaproteobacteria and Unclassified Spartobacteria journal May 2018
Glucose triggers strong taxon‐specific responses in microbial growth and activity: insights from DNA and RNA qSIP journal November 2019
Structure and variation of root-associated microbiomes of potato grown in alfisol journal November 2019
Soil microbial community composition in tallgrass prairie restorations converge with remnants across a 27‐year chronosequence journal July 2017
The Hidden World within Plants: Ecological and Evolutionary Considerations for Defining Functioning of Microbial Endophytes journal July 2015

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