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Artículo

Explaining coexistence of nitrogen fixing and non-fixing rhizobia in legume-rhizobia mutualism using mathematical modeling

Moyano, Gabriel EduardoIcon ; Marco, Diana ElizabethIcon ; Knopoff, Damián AlejandroIcon ; Torres, German ArielIcon ; Turner, Cristina VilmaIcon
Fecha de publicación: 12/07/2017
Editorial: Elsevier
Revista: Mathematical Biosciences
ISSN: 0025-5564
e-ISSN: 1879-3134
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Matemática Pura

Resumen

In the mutualism established between legumes and soil bacteria known as rhizobia, bacteria from soil infect plants roots and reproduce inside root nodules where they fix atmospheric N2 for plant nutrition, receiving carbohydrates in exchange. Host-plant sanctions against non N2 fixing, cheating bacterial symbionts have been proposed to act in the legume-Rhizobium symbiosis, to preserve the mutualistic relationship. Sanctions include decreased rhizobial survival in nodules occupied by cheating rhizobia. Previously, a simple population model experimentally based showed that the coexistence of fixing and cheating rhizobia strains commonly found in field conditions is possible, and that the inclusion of sanctions leads to the extinction of cheating strains in soil. Here, we extend the previous model to include other factors that could complicate the sanction scenario, like horizontal transmission of symbiotic plasmids, turning non-nodulating strains into nodulating rhizobia, and competition between fixing and cheating strains for nodulation. In agreement with previous results, we show that plant populations persist even in the presence of cheating rhizobia without incorporating any sanction against the cheater populations in the model, under the realistic assumption that plants can at least get some amount of fixed N2 from the effectively mutualistic rhizobia occupying some nodules. Inclusion of plant sanctions leads to the unrealistic extinction of cheater strains in soil. Our results agree with increasing experimental evidence and theoretical work showing that mutualisms can persist in presence of cheating partners.
Palabras clave: Mutualism , Cheating , Legume Rizhobia Symbiosis , Host Sanctions , Mathematical Modeling , Agriculture
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info:eu-repo/semantics/embargoedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/27605
DOI: http://dx.doi.org/10.1016/j.mbs.2017.07.001
URL: https://www.sciencedirect.com/science/article/pii/S0025556416303893
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Articulos(IMIT)
Articulos de INST.DE MODELADO E INNOVACION TECNOLOGICA
Citación
Moyano, Gabriel Eduardo; Marco, Diana Elizabeth; Knopoff, Damián Alejandro; Torres, German Ariel; Turner, Cristina Vilma; Explaining coexistence of nitrogen fixing and non-fixing rhizobia in legume-rhizobia mutualism using mathematical modeling; Elsevier; Mathematical Biosciences; 292; 12-7-2017; 30-35
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