Nitrogen addition results in Medicago sativa switching nitrogen sources

dc.contributor.authorWang, Yinliu
dc.contributor.authorHasi, Muqier
dc.contributor.authorBu, Dongdong
dc.contributor.authorLi, Ang
dc.contributor.authorXue, Jianguo
dc.contributor.authorWang, Changhui
dc.contributor.authorTian, Qiuying
dc.contributor.authorNiu, Guoxiang
dc.contributor.authorGeng, Qianqian
dc.contributor.authorWang, Lixin
dc.contributor.authorHuang, Jianhui
dc.contributor.departmentEarth Sciences, School of Scienceen_US
dc.date.accessioned2023-03-22T21:08:47Z
dc.date.available2023-03-22T21:08:47Z
dc.date.issued2021
dc.description.abstractBackground Nitrogen (N) addition may have strong impacts on legume growth and their biological N fixation (BNF), but how legume N acquisition sources respond to N inputs have yet to be comprehensively assessed.Aims We quantified the effects of N addition on the growth and BNF of Medicago sativa and to assess the response of legume N acquisition to N addition.Methods We grew M. sativa in the greenhouse under gradients of added NH4NO3 and analysed the variables that were relative to growth and BNF, such as N concentration, biomass, δ15N values, nodule number, percentage of N derived from the atmosphere (Ndfa%).Results Nitrogen addition had marginal effects on plant biomass production and foliar N concentration. Foliar δ15N value increased with increasing added N, while Ndfa% decreased. The number of nodules formed also decreased with N addition while the nitrogenase (nifH)genecopies per unit nodule mass was not significantly different with N addition.Conclusions These findings indicate that increasing mineral N availability decreases symbiotic investment into BNF, mainly by reducing nodule formation; this was found to have no significant impact on plant growth because the plant changes its N source from BNF-N to mineral N derived from the soil.en_US
dc.eprint.versionAuthor's manuscripten_US
dc.identifier.citationWang, Y., Hasi, M., Bu, D., Li, A., Xue, J., Wang, C., Tian, Q., Niu, G., Geng, Q., Wang, L., & Huang, J. (2021). Nitrogen addition results in Medicago sativa switching nitrogen sources. Plant Ecology & Diversity, 14(3–4), 183–194. https://doi.org/10.1080/17550874.2021.2007309en_US
dc.identifier.issn1755-0874, 1755-1668en_US
dc.identifier.urihttps://hdl.handle.net/1805/32030
dc.language.isoen_USen_US
dc.publisherTaylor & Francisen_US
dc.relation.isversionof10.1080/17550874.2021.2007309en_US
dc.relation.journalPlant Ecology & Diversityen_US
dc.rightsPublisher Policyen_US
dc.sourceAuthoren_US
dc.subjectBiological N fixationen_US
dc.subjectN concentrationen_US
dc.subjectstable isotopeen_US
dc.subjectδ15Nen_US
dc.titleNitrogen addition results in Medicago sativa switching nitrogen sourcesen_US
dc.typeArticleen_US
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