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Title: Climate and edaphic controllers influence rhizosphere community assembly for a wild annual grass

Abstract

The interface between roots and soil, known as the rhizosphere, is a dynamic habitat in the soil ecosystem. Unraveling the factors that control rhizosphere community assembly is a key starting point for understanding the diversity of plant-microbial interactions that occur in soil. The goals of this study were to determine how environmental factors shape rhizosphere microbial communities, such as local soil characteristics and the regional climate, and to determine the relative influence of the rhizosphere on microbial community assembly compared to the pressures imposed by the local and regional environment. We identified the bacteria present in the soil immediately adjacent to the roots of wild oat (Avena spp.) in three California grasslands using deep Illumina 16S sequencing. Rhizosphere communities were more similar to each other than to the surrounding soil communities from which they were derived, despite the fact that the grasslands studied were separated by hundreds of kilometers. The rhizosphere was the dominant factor structuring bacterial community composition (38% variance explained), and was comparable in magnitude to the combined local and regional effects (22% and 21%, respectively). Rhizosphere communities were most influenced by factors related to the regional climate (soil moisture and temperature), while background soil communities were moremore » influenced by soil characteristics (pH, CEC, exchangeable cations, clay content). The Avena core microbiome was strongly phylogenetically clustered according to the metrics NRI and NTI, which indicates that selective processes likely shaped these communities. Furthermore, 17% of these taxa were not detectable in the background soil, even with a robust sequencing depth of approximately 70,000 sequences per sample. These results support the hypothesis that roots select less abundant or possibly rare populations in the soil microbial community, which appear to be lineages of bacteria that have made a physiological tradeoff for rhizosphere competence at the expense of their competitiveness in non-rhizosphere soil.« less

Authors:
 [1];  [2];  [3];  [4];  [3];  [5];  [5]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Physical and Life Sciences Directorate; Univ. of California, Berkeley, CA (United States). Dept. of Plant and Microbial Biology
  2. Univ. of California, Berkeley, CA (United States). Dept. of Plant and Microbial Biology
  3. Univ. of California, Berkeley, CA (United States). Dept. of Environmental Science, Policy and Management
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Physical and Life Sciences Directorate
  5. Univ. of California, Berkeley, CA (United States). Dept. of Environmental Science, Policy and Management; Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Earth and Environmental Sciences
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1581117
Alternate Identifier(s):
OSTI ID: 1325886; OSTI ID: 1400974; OSTI ID: 1440928
Report Number(s):
LLNL-JRNL-670998
Journal ID: ISSN 0012-9658; ark:/13030/qt4rp9k2qg
Grant/Contract Number:  
AC02-05CH11231; AC52-07NA27344; SC0004730; SC0010570; SCW1421
Resource Type:
Accepted Manuscript
Journal Name:
Ecology
Additional Journal Information:
Journal Volume: 97; Journal Issue: 5; Journal ID: ISSN 0012-9658
Publisher:
Ecological Society of America (ESA)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 59 BASIC BIOLOGICAL SCIENCES; 60 APPLIED LIFE SCIENCES; rhizosphere; microbiome; plant-microbial interactions; community assembly; soil; climate; Avena

Citation Formats

Nuccio, Erin E., Anderson-Furgeson, James, Estera, Katerina Y., Pett-Ridge, Jennifer, de Valpine, Perry, Brodie, Eoin L., and Firestone, Mary K. Climate and edaphic controllers influence rhizosphere community assembly for a wild annual grass. United States: N. p., 2016. Web. doi:10.1890/15-0882.1.
Nuccio, Erin E., Anderson-Furgeson, James, Estera, Katerina Y., Pett-Ridge, Jennifer, de Valpine, Perry, Brodie, Eoin L., & Firestone, Mary K. Climate and edaphic controllers influence rhizosphere community assembly for a wild annual grass. United States. https://doi.org/10.1890/15-0882.1
Nuccio, Erin E., Anderson-Furgeson, James, Estera, Katerina Y., Pett-Ridge, Jennifer, de Valpine, Perry, Brodie, Eoin L., and Firestone, Mary K. Tue . "Climate and edaphic controllers influence rhizosphere community assembly for a wild annual grass". United States. https://doi.org/10.1890/15-0882.1. https://www.osti.gov/servlets/purl/1581117.
@article{osti_1581117,
title = {Climate and edaphic controllers influence rhizosphere community assembly for a wild annual grass},
author = {Nuccio, Erin E. and Anderson-Furgeson, James and Estera, Katerina Y. and Pett-Ridge, Jennifer and de Valpine, Perry and Brodie, Eoin L. and Firestone, Mary K.},
abstractNote = {The interface between roots and soil, known as the rhizosphere, is a dynamic habitat in the soil ecosystem. Unraveling the factors that control rhizosphere community assembly is a key starting point for understanding the diversity of plant-microbial interactions that occur in soil. The goals of this study were to determine how environmental factors shape rhizosphere microbial communities, such as local soil characteristics and the regional climate, and to determine the relative influence of the rhizosphere on microbial community assembly compared to the pressures imposed by the local and regional environment. We identified the bacteria present in the soil immediately adjacent to the roots of wild oat (Avena spp.) in three California grasslands using deep Illumina 16S sequencing. Rhizosphere communities were more similar to each other than to the surrounding soil communities from which they were derived, despite the fact that the grasslands studied were separated by hundreds of kilometers. The rhizosphere was the dominant factor structuring bacterial community composition (38% variance explained), and was comparable in magnitude to the combined local and regional effects (22% and 21%, respectively). Rhizosphere communities were most influenced by factors related to the regional climate (soil moisture and temperature), while background soil communities were more influenced by soil characteristics (pH, CEC, exchangeable cations, clay content). The Avena core microbiome was strongly phylogenetically clustered according to the metrics NRI and NTI, which indicates that selective processes likely shaped these communities. Furthermore, 17% of these taxa were not detectable in the background soil, even with a robust sequencing depth of approximately 70,000 sequences per sample. These results support the hypothesis that roots select less abundant or possibly rare populations in the soil microbial community, which appear to be lineages of bacteria that have made a physiological tradeoff for rhizosphere competence at the expense of their competitiveness in non-rhizosphere soil.},
doi = {10.1890/15-0882.1},
journal = {Ecology},
number = 5,
volume = 97,
place = {United States},
year = {Tue May 10 00:00:00 EDT 2016},
month = {Tue May 10 00:00:00 EDT 2016}
}

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