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Organization of biogeochemical nitrogen pathways with switch-like adjustment in fluctuating soil redox conditions

Nitrogen is cycled throughout ecosystems by a suite of biogeochemical processes. The high complexity of the nitrogen cycle resides in an intricate interplay between reversible biochemical pathways alternatively and specifically activated in response to diverse environmental cues. Despite aggressive...

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Autores principales: Lamba, Sanjay, Bera, Soumen, Rashid, Mubasher, Medvinsky, Alexander B., Sun, Gui-Quan, Acquisti, Claudia, Chakraborty, Amit, Li, Bai-Lian
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society Publishing 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5319346/
https://www.ncbi.nlm.nih.gov/pubmed/28280580
http://dx.doi.org/10.1098/rsos.160768
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author Lamba, Sanjay
Bera, Soumen
Rashid, Mubasher
Medvinsky, Alexander B.
Sun, Gui-Quan
Acquisti, Claudia
Chakraborty, Amit
Li, Bai-Lian
author_facet Lamba, Sanjay
Bera, Soumen
Rashid, Mubasher
Medvinsky, Alexander B.
Sun, Gui-Quan
Acquisti, Claudia
Chakraborty, Amit
Li, Bai-Lian
author_sort Lamba, Sanjay
collection PubMed
description Nitrogen is cycled throughout ecosystems by a suite of biogeochemical processes. The high complexity of the nitrogen cycle resides in an intricate interplay between reversible biochemical pathways alternatively and specifically activated in response to diverse environmental cues. Despite aggressive research, how the fundamental nitrogen biochemical processes are assembled and maintained in fluctuating soil redox conditions remains elusive. Here, we address this question using a kinetic modelling approach coupled with dynamical systems theory and microbial genomics. We show that alternative biochemical pathways play a key role in keeping nitrogen conversion and conservation properties invariant in fluctuating environments. Our results indicate that the biochemical network holds inherent adaptive capacity to stabilize ammonium and nitrate availability, and that the bistability in the formation of ammonium is linked to the transient upregulation of the amo-hao mediated nitrification pathway. The bistability is maintained by a pair of complementary subsystems acting as either source or sink type systems in response to soil redox fluctuations. It is further shown how elevated anthropogenic pressure has the potential to break down the stability of the system, altering substantially ammonium and nitrate availability in the soil, with dramatic effects on biodiversity.
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spelling pubmed-53193462017-03-09 Organization of biogeochemical nitrogen pathways with switch-like adjustment in fluctuating soil redox conditions Lamba, Sanjay Bera, Soumen Rashid, Mubasher Medvinsky, Alexander B. Sun, Gui-Quan Acquisti, Claudia Chakraborty, Amit Li, Bai-Lian R Soc Open Sci Earth Science Nitrogen is cycled throughout ecosystems by a suite of biogeochemical processes. The high complexity of the nitrogen cycle resides in an intricate interplay between reversible biochemical pathways alternatively and specifically activated in response to diverse environmental cues. Despite aggressive research, how the fundamental nitrogen biochemical processes are assembled and maintained in fluctuating soil redox conditions remains elusive. Here, we address this question using a kinetic modelling approach coupled with dynamical systems theory and microbial genomics. We show that alternative biochemical pathways play a key role in keeping nitrogen conversion and conservation properties invariant in fluctuating environments. Our results indicate that the biochemical network holds inherent adaptive capacity to stabilize ammonium and nitrate availability, and that the bistability in the formation of ammonium is linked to the transient upregulation of the amo-hao mediated nitrification pathway. The bistability is maintained by a pair of complementary subsystems acting as either source or sink type systems in response to soil redox fluctuations. It is further shown how elevated anthropogenic pressure has the potential to break down the stability of the system, altering substantially ammonium and nitrate availability in the soil, with dramatic effects on biodiversity. The Royal Society Publishing 2017-01-11 /pmc/articles/PMC5319346/ /pubmed/28280580 http://dx.doi.org/10.1098/rsos.160768 Text en © 2017 The Authors. http://creativecommons.org/licenses/by/4.0/ Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
spellingShingle Earth Science
Lamba, Sanjay
Bera, Soumen
Rashid, Mubasher
Medvinsky, Alexander B.
Sun, Gui-Quan
Acquisti, Claudia
Chakraborty, Amit
Li, Bai-Lian
Organization of biogeochemical nitrogen pathways with switch-like adjustment in fluctuating soil redox conditions
title Organization of biogeochemical nitrogen pathways with switch-like adjustment in fluctuating soil redox conditions
title_full Organization of biogeochemical nitrogen pathways with switch-like adjustment in fluctuating soil redox conditions
title_fullStr Organization of biogeochemical nitrogen pathways with switch-like adjustment in fluctuating soil redox conditions
title_full_unstemmed Organization of biogeochemical nitrogen pathways with switch-like adjustment in fluctuating soil redox conditions
title_short Organization of biogeochemical nitrogen pathways with switch-like adjustment in fluctuating soil redox conditions
title_sort organization of biogeochemical nitrogen pathways with switch-like adjustment in fluctuating soil redox conditions
topic Earth Science
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5319346/
https://www.ncbi.nlm.nih.gov/pubmed/28280580
http://dx.doi.org/10.1098/rsos.160768
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