Abstract
The effect of salt (NaCl) stress on plant growth and nitrogen-fixing apparatus was studied for symbiotic associations established between three Medicago truncatula lines inoculated and two Sinorhizobium meliloti strains. Salinity modulated all parameters analyzed as indices of growth performance, nitrogen-fixing capacity (acetylene-reduction assay) and nodule antioxidant system. Under stressful conditions, symbioses showed variability of response to salt application. Contrasting symbiotic associations were identified for nodulation, nitrogen-fixing capacity and salt tolerance. The total variance of analyzed performance indices under stressful conditions depended essentially on plant genotype factor. In nodules, the NaCl application had a decreasing effect on the rates of protein content and some antioxidant enzymes mainly catalase. Other enzymes such as guaiacol peroxidase increased in stressed nodules.
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Mhadhbi, H., Aouani, M.E. (2008). Growth and nitrogen-fixing performances of medicago truncatula-Sinorhizobium meliloti symbioses under salt (NaCl) stress: Micro- and macro-symbiont contribution into symbiosis tolerance. In: Abdelly, C., Öztürk, M., Ashraf, M., Grignon, C. (eds) Biosaline Agriculture and High Salinity Tolerance. Birkhäuser Basel. https://doi.org/10.1007/978-3-7643-8554-5_9
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DOI: https://doi.org/10.1007/978-3-7643-8554-5_9
Publisher Name: Birkhäuser Basel
Print ISBN: 978-3-7643-8553-8
Online ISBN: 978-3-7643-8554-5
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