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Many are also denitrifiers, which can act as sinks or sources for N\n                    <jats:sub>2<\/jats:sub>\n                    O. Inoculation with compatible rhizobia is often needed for optimal N\n                    <jats:sub>2<\/jats:sub>\n                    \u2010fixation, but the choice of inoculant may have consequences for N\n                    <jats:sub>2<\/jats:sub>\n                    O emission. Here, we determined the phylogeny and denitrification capacity of\n                    <jats:italic>Bradyrhizobium<\/jats:italic>\n                    strains, most of them isolated from peanut\u2010nodules. Analyses of genomes and denitrification end\u2010points showed that all were denitrifiers, but only ~1\/3 could reduce N\n                    <jats:sub>2<\/jats:sub>\n                    O. The N\n                    <jats:sub>2<\/jats:sub>\n                    O\u2010reducing isolates had strong preference for N\n                    <jats:sub>2<\/jats:sub>\n                    O\u2010 over NO\n                    <jats:sub>3<\/jats:sub>\n                    <jats:sup>\u2212<\/jats:sup>\n                    \u2010reduction. Such preference was also observed in a study of other bradyrhizobia and tentatively ascribed to competition between the electron pathways to Nap (periplasmic NO\n                    <jats:sub>3<\/jats:sub>\n                    <jats:sup>\u2212<\/jats:sup>\n                    reductase) and Nos (N\n                    <jats:sub>2<\/jats:sub>\n                    O reductase). Another possible explanation is lower abundance of Nap than Nos. Here, proteomics revealed that Nap was instead more abundant than Nos, supporting the hypothesis that the electron pathway to Nos outcompetes that to Nap. In contrast,\n                    <jats:italic>Paracoccus denitrificans<\/jats:italic>\n                    , which has membrane\u2010bond NO\n                    <jats:sub>3<\/jats:sub>\n                    <jats:sup>\u2212<\/jats:sup>\n                    reductase (Nar), reduced N\n                    <jats:sub>2<\/jats:sub>\n                    O and NO\n                    <jats:sub>3<\/jats:sub>\n                    <jats:sup>\u2212<\/jats:sup>\n                    simultaneously. We propose that the control at the metabolic level, favouring N\n                    <jats:sub>2<\/jats:sub>\n                    O reduction over NO\n                    <jats:sub>3<\/jats:sub>\n                    <jats:sup>\u2212<\/jats:sup>\n                    reduction, applies also to other denitrifiers carrying Nos and Nap but lacking Nar.\n                  <\/jats:p>","DOI":"10.1111\/1462-2920.15404","type":"journal-article","created":{"date-parts":[[2021,1,19]],"date-time":"2021-01-19T08:12:39Z","timestamp":1611043959000},"page":"2244-2259","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":50,"title":["Competition for electrons favours\n                    <scp>\n                      N\n                      <sub>2<\/sub>\n                      O\n                    <\/scp>\n                    reduction in denitrifying\n                    <i>Bradyrhizobium<\/i>\n                    isolates"],"prefix":"10.1111","volume":"23","author":[{"given":"Yuan","family":"Gao","sequence":"first","affiliation":[{"name":"Faculty of Chemistry, Biotechnology and Food Sciences Norwegian University of Life Sciences  Aas Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniel","family":"Mania","sequence":"additional","affiliation":[{"name":"Faculty of Chemistry, Biotechnology and Food Sciences Norwegian University of Life Sciences  Aas Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Seyed Abdollah","family":"Mousavi","sequence":"additional","affiliation":[{"name":"Ecosystems and Environment Research programme, Faculty of Biological and Environmental Sciences and Helsinki Institute of Sustainability Science (HELSUS), University of Helsinki  Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pawel","family":"Lycus","sequence":"additional","affiliation":[{"name":"Faculty of Chemistry, Biotechnology and Food Sciences Norwegian University of Life Sciences  Aas Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Magnus \u00d8.","family":"Arntzen","sequence":"additional","affiliation":[{"name":"Faculty of Chemistry, Biotechnology and Food Sciences Norwegian University of Life Sciences  Aas Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kedir","family":"Woliy","sequence":"additional","affiliation":[{"name":"Faculty of Chemistry, Biotechnology and Food Sciences Norwegian University of Life Sciences  Aas Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kristina","family":"Lindstr\u00f6m","sequence":"additional","affiliation":[{"name":"Ecosystems and Environment Research programme, Faculty of Biological and Environmental Sciences and Helsinki Institute of Sustainability Science (HELSUS), University of Helsinki  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