Spatial organization of a soil cyanobacterium and its cyanosphere through GABA/Glu signaling to optimize mutualistic nitrogen fixation
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Título: | Spatial organization of a soil cyanobacterium and its cyanosphere through GABA/Glu signaling to optimize mutualistic nitrogen fixation |
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Autor/es: | Nelson, Corey | Dadi, Pavani | Shah, Dhara D. | Garcia-Pichel, Ferran |
Grupo/s de investigación o GITE: | Laboratorio de Ecología de Zonas Áridas y Cambio Global (DRYLAB) |
Centro, Departamento o Servicio: | Universidad de Alicante. Instituto Multidisciplinar para el Estudio del Medio "Ramón Margalef" |
Palabras clave: | Biocrusts | Biological soil crusts | Cyanobacteria | Aggregation | Motility | GABA | Glutamate | Microbiome |
Fecha de publicación: | 16-ene-2024 |
Editor: | Oxford University Press |
Cita bibliográfica: | The ISME Journal. 2024, 18(1): wrad029. https://doi.org/10.1093/ismejo/wrad029 |
Resumen: | Soil biocrusts are characterized by the spatial self-organization of resident microbial populations at small scales. The cyanobacterium Microcoleus vaginatus, a prominent primary producer and pioneer biocrust former, relies on a mutualistic carbon (C) for nitrogen (N) exchange with its heterotrophic cyanosphere microbiome, a mutualism that may be optimized through the ability of the cyanobacterium to aggregate into bundles of trichomes. Testing both environmental populations and representative isolates, we show that the proximity of mutualistic diazotroph populations results in M. vaginatus bundle formation orchestrated through chemophobic and chemokinetic responses to gamma-aminobutyric acid (GABA) /glutamate (Glu) signals. The signaling system is characterized by: a high GABA sensitivity (nM range) and low Glu sensitivity (μM to mM), the fact that GABA and Glu are produced by the cyanobacterium as an autoinduction response to N deficiency, and by the presence of interspecific signaling by heterotrophs in response to C limitation. Further, it crucially switches from a positive to a negative feedback loop with increasing GABA concentration, thus setting maximal bundle sizes. The unprecedented use of GABA/Glu as an intra- and interspecific signal in the spatial organization of microbiomes highlights the pair as truly universal infochemicals. |
Patrocinador/es: | This work was supported in part by the Jornada Basin LTER Graduate Research Fellowship Program to C.N. (DEB 2025166) and by National Science Foundation (DEB 2129537) to F.G.-P. |
URI: | http://hdl.handle.net/10045/141902 |
ISSN: | 1751-7362 (Print) | 1751-7370 (Online) |
DOI: | 10.1093/ismejo/wrad029 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © The Author(s) 2024. Published by Oxford University Press on behalf of the International Society for Microbial Ecology. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. |
Revisión científica: | si |
Versión del editor: | https://doi.org/10.1093/ismejo/wrad029 |
Aparece en las colecciones: | INV - DRYLAB - Artículos de Revistas |
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Nelson_etal_2024_ISMEJ.pdf | 1,56 MB | Adobe PDF | Abrir Vista previa | |
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