Levels of Periplasmic Nitrate Reductase during Denitrification are Lower in Bradyrhizobium japonicum than in Bradyrhizobium diazoefficiens

Soybean plants host endosymbiotic dinitrogen (N(2))-fixing bacteria from the genus Bradyrhizobium. Under oxygen-limiting conditions, Bradyrhizobium diazoefficiens and Bradyrhizobium japonicum perform denitrification by sequentially reducing nitrate (NO(3)(–)) to nitrous oxide (N(2)O) or N(2). The an...

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Detalles Bibliográficos
Autores principales: Siqueira, Arthur Fernandes, Sugawara, Masayuki, Arashida, Haruka, Minamisawa, Kiwamu, Sánchez, Cristina
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Japanese Society of Microbial Ecology / Japanese Society of Soil Microbiology / Taiwan Society of Microbial Ecology / Japanese Society of Plant Microbe Interactions / Japanese Society for Extremophiles 2020
Materias:
Short Communication
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7511789/
https://www.ncbi.nlm.nih.gov/pubmed/32554940
http://dx.doi.org/10.1264/jsme2.ME19129
Descripción
Sumario:Soybean plants host endosymbiotic dinitrogen (N(2))-fixing bacteria from the genus Bradyrhizobium. Under oxygen-limiting conditions, Bradyrhizobium diazoefficiens and Bradyrhizobium japonicum perform denitrification by sequentially reducing nitrate (NO(3)(–)) to nitrous oxide (N(2)O) or N(2). The anaerobic reduction of NO(3)(–) to N(2)O was previously shown to be lower in B. japonicum than in B. diazoefficiens due to impaired periplasmic nitrate reductase (Nap) activity in B. japonicum. We herein demonstrated that impaired Nap activity in B. japonicum was due to low Nap protein levels, which may be related to a decline in the production of FixP and FixO proteins by the cbb(3)-type oxidase.

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