Keystone metabolites of crop rhizosphere microbiomes

The role of microbes in sustaining agricultural plant growth has great potential consequences for human prosperity. Yet we have an incomplete understanding of the basic function of rhizosphere microbial communities and how they may change under future stresses, let alone how these processes might be...

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Published in:Current biology Vol. 30; no. 19; pp. R1131 - R1137
Main Authors: Dahlstrom, Kurt M., McRose, Darcy L., Newman, Dianne K.
Format: Journal Article
Language:English
Published: England Elsevier Inc 05-10-2020
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Abstract The role of microbes in sustaining agricultural plant growth has great potential consequences for human prosperity. Yet we have an incomplete understanding of the basic function of rhizosphere microbial communities and how they may change under future stresses, let alone how these processes might be harnessed to sustain or improve crop yields. A reductionist approach may aid the generation and testing of hypotheses that can ultimately be translated to agricultural practices. With this in mind, we ask whether some rhizosphere microbial communities might be governed by ‘keystone metabolites’, envisioned here as microbially produced molecules that, through antibiotic and/or growth-promoting properties, may play an outsized role in shaping the development of the community spatiotemporally. To illustrate this point, we use the example of redox-active metabolites, and in particular phenazines, which are produced by many bacteria found in agricultural soils and have well-understood catalytic properties. Phenazines can act as potent antibiotics against a variety of cell types, yet they also can promote the acquisition of essential inorganic nutrients. In this essay, we suggest the ways these metabolites might affect microbial communities and ultimately agricultural productivity in two specific scenarios: firstly, in the biocontrol of beneficial and pathogenic fungi in increasingly arid crop soils and, secondly, through promotion of phosphorus bioavailability and sustainable fertilizer use. We conclude with specific proposals for future research. Dahlstrom et al. put forward redox-active metabolites as potential ‘keystone metabolites’ that may both control the composition of microbial communities associated with plants and influence the availability of nutrients, with potentially important ramifications for crop yields in a warming climate.
AbstractList The role of microbes in sustaining agricultural plant growth has great potential consequences for human prosperity. Yet we have an incomplete understanding of the basic function of rhizosphere microbial communities and how they may change under future stresses, let alone how these processes might be harnessed to sustain or improve crop yields. A reductionist approach may aid the generation and testing of hypotheses that can ultimately be translated to agricultural practices. With this in mind, we ask whether some rhizosphere microbial communities might be governed by ‘keystone metabolites’, envisioned here as microbially produced molecules that, through antibiotic and/or growth-promoting properties, may play an outsized role in shaping the development of the community spatiotemporally. To illustrate this point, we use the example of redox-active metabolites, and in particular phenazines, which are produced by many bacteria found in agricultural soils and have well-understood catalytic properties. Phenazines can act as potent antibiotics against a variety of cell types, yet they also can promote the acquisition of essential inorganic nutrients. In this essay, we suggest the ways these metabolites might affect microbial communities and ultimately agricultural productivity in two specific scenarios: firstly, in the biocontrol of beneficial and pathogenic fungi in increasingly arid crop soils and, secondly, through promotion of phosphorus bioavailability and sustainable fertilizer use. We conclude with specific proposals for future research. Dahlstrom et al. put forward redox-active metabolites as potential ‘keystone metabolites’ that may both control the composition of microbial communities associated with plants and influence the availability of nutrients, with potentially important ramifications for crop yields in a warming climate.
The role of microbes in sustaining agricultural plant growth has great potential consequences for human prosperity. Yet we have an incomplete understanding of the basic function of rhizosphere microbial communities and how they may change under future stresses, let alone how these processes might be harnessed to sustain or improve crop yields. A reductionist approach may aid the generation and testing of hypotheses that can ultimately be translated to agricultural practices. With this in mind, we ask whether some rhizosphere microbial communities might be governed by 'keystone metabolites', envisioned here as microbially produced molecules that, through antibiotic and/or growth-promoting properties, may play an outsized role in shaping the development of the community spatiotemporally. To illustrate this point, we use the example of redox-active metabolites, and in particular phenazines, which are produced by many bacteria found in agricultural soils and have well-understood catalytic properties. Phenazines can act as potent antibiotics against a variety of cell types, yet they also can promote the acquisition of essential inorganic nutrients. In this essay, we suggest the ways these metabolites might affect microbial communities and ultimately agricultural productivity in two specific scenarios: firstly, in the biocontrol of beneficial and pathogenic fungi in increasingly arid crop soils and, secondly, through promotion of phosphorus bioavailability and sustainable fertilizer use. We conclude with specific proposals for future research.
The role of microbes in sustaining agricultural plant growth has great potential consequences for human prosperity. Yet we have an incomplete understanding of the basic function of rhizosphere microbial communities and how they may change under future stresses, let alone how these processes might be harnessed to sustain or improve crop yields. A reductionist approach may aid the generation and testing of hypotheses that can ultimately be translated to agricultural practices. With this in mind, we ask whether some rhizosphere microbial communities might be governed by “keystone metabolites”, envisioned here as microbially produced molecules that, through antibiotic and/or growth-promoting properties, may play an outsized role in shaping the development of the community spatiotemporally. To illustrate this point, we use the example of redox-active metabolites, and in particular phenazines, which are produced by many bacteria found in agricultural soils and have well-understood catalytic properties. Phenazines can act as potent antibiotics against a variety of cell types, yet they also can promote the acquisition of essential inorganic nutrients. In this essay, we suggest the ways these metabolites might affect microbial communities and ultimately agricultural productivity in two specific scenarios: i) biocontrol of beneficial and pathogenic fungi in increasingly arid crop soils and ii) promotion of phosphorus bioavailability and sustainable fertilizer use. We conclude with specific proposals for future research.
Author McRose, Darcy L.
Newman, Dianne K.
Dahlstrom, Kurt M.
AuthorAffiliation 1 Division of Biology and Biological Engineering, California Institute of Technology, Pasadena California, 91125
2 Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena California, 91125
AuthorAffiliation_xml – name: 2 Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena California, 91125
– name: 1 Division of Biology and Biological Engineering, California Institute of Technology, Pasadena California, 91125
Author_xml – sequence: 1
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  surname: Dahlstrom
  fullname: Dahlstrom, Kurt M.
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  givenname: Darcy L.
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  givenname: Dianne K.
  surname: Newman
  fullname: Newman, Dianne K.
  email: dkn@caltech.edu
  organization: Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA
BackLink https://www.ncbi.nlm.nih.gov/pubmed/33022255$$D View this record in MEDLINE/PubMed
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