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dc.contributor.authorMania, Daniel
dc.contributor.authorWoliy, Kedir
dc.contributor.authorDegefu, Tulu
dc.contributor.authorFrostegård, Åsa
dc.date.accessioned2020-07-28T07:18:18Z
dc.date.available2020-07-28T07:18:18Z
dc.date.created2019-09-25T10:21:21Z
dc.date.issued2019
dc.identifier.citationEnvironmental Microbiology. 2019, 22 (1), 17-31.en_US
dc.identifier.issn1462-2912
dc.identifier.urihttps://hdl.handle.net/11250/2670287
dc.description.abstractBradyrhizobia are abundant soil bacteria, which can formnitrogen-fixing symbioses with leguminous plants, including important crops such as soybean, cowpea and peanut. Many bradyrhizobia can denitrify, but studies have hitherto focused on a few model organisms. We screened 39 diverse Bradyrhizobium strains, isolated from legume nodules. Half of them were unable to reduce N2O, making them sources of this greenhouse gas. Most others could denitrify NO3 − to N2. Timeresolved gas kinetics and transcription analyses during transition to anaerobic respiration revealed a common regulation of nirK, norCB and nosZ (encoding NO2 −, NO and N2O reductases), and differing regulation of napAB (encoding periplasmic NO3 − reductase). A prominent feature in all N2-producing strains was a virtually complete hampering of NO3 − reduction in the presence of N2O. In-depth analyses suggest that this was due to a competition between electron transport pathways, strongly favouring N2OoverNO3 − reduction. In a natural context, bacteria with this feature would preferentially reduce available N2O, produced by themselves or other soil bacteria,making them powerful sinks for this greenhouse gas. One way to augment such populations in agricultural soils is to develop inoculants for legume crops with dual capabilities of efficient N2-fixation and efficient N2O reduction.en_US
dc.language.isoengen_US
dc.rightsNavngivelse-Ikkekommersiell 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/deed.no*
dc.titleA common mechanism for efficient N2O reduction in diverse isolates of nodule-forming bradyrhizobiaen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.description.versionpublishedVersionen_US
dc.source.pagenumber17-31en_US
dc.source.volume22en_US
dc.source.journalEnvironmental Microbiologyen_US
dc.source.issue1en_US
dc.identifier.doi10.1111/1462-2920.14731
dc.identifier.cristin1728701
dc.relation.projectEC/H2020/290488en_US
dc.relation.projectNorges forskningsråd: 290488en_US
cristin.unitcode192,12,0,0
cristin.unitnameKjemi, bioteknologi og matvitenskap
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode2


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