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Long-term effects of nitrate on lucerne (Medicago sativa L.) nitrogen fixation is not influenced by the denitrification status of the microsymbiont

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Abstract

Studies on the inhibitory effects of combined nitrogen on biological nitrogen fixation in legume crops have been usually carried out after short-term nitrate treatments at high concentrations. As these treatments are quite different from field conditions, a study was conducted to evaluate the effects of the continuous presence of nitrate (0, 1, 5 and 10 mM) throughout three months on lucerne (Medicago sativa L.). Plants were grown in a greenhouse with perlite as substrate and were inoculated with a denitrifying Sinorhizobium meliloti strain (102-F-51) and a non-denitrifying strain (102-F-65). During the first 60 days of growth, the highest nitrate treatment resulted in a complete inhibition of the main symbiotic parameters (nodule initiation and development and specific nitrogen fixation) in plants inoculated with either strain. However, after 3 months of growth in the presence of nitrate, this inhibition was partly abolished, with a high number of new functioning nodules being formed. Acetylene reduction activity (ARA) of these plants was 70% of the control plants. As this process was observed in plants nodulated with either strain, it is concluded that this was not related to the denitrifying ability of the strain, but is an intrinsic property of the lucerne nitrogen fixing system. As legume plants usually grow under natural field conditions in the continuous presence of nitrate, the ability to use simultaneously nitrate and atmospheric nitrogen could be of adaptive and agronomic importance.

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Authors and Affiliations

  1. Departamento de Biología Vegetal y Ecología, Universidad del País Vasco, Aptdo 644, E-48080, Bilbao, Spain FAX No

    J.I. García-Plazaola, A. Hernández & J. M. Becerril

  2. Department of Environmental Sciences, Public University of Navarra, Campus de Arrosadía, E-31006, Pamplona, Spain

    C. Arrese-Igor

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  1. J.I. García-Plazaola
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  2. A. Hernández
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  3. J. M. Becerril
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  4. C. Arrese-Igor
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García-Plazaola, J., Hernández, A., Becerril, J.M. et al. Long-term effects of nitrate on lucerne (Medicago sativa L.) nitrogen fixation is not influenced by the denitrification status of the microsymbiont. Plant and Soil 216, 139–145 (1999). https://doi.org/10.1023/A:1004716306003

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