Polyamines contribute to salinity tolerance in the symbiosis Medicago truncatula-Sinorhizobium meliloti by preventing oxidative damage
| Autor: | J. Rubén Muñoz-Sánchez, Javier Hidalgo-Castellanos, Agustín J. Marín-Peña, Carmen Lluch, José A. Herrera-Cervera, Miguel López-Gómez |
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| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
0301 basic medicine Spermidine Physiology Spermine Plant Science Sodium Chloride Biology 01 natural sciences 03 medical and health sciences chemistry.chemical_compound Brassinosteroids Medicago truncatula Polyamines Genetics Proline Symbiosis Sinorhizobium meliloti fungi food and beverages Nitrogenase biology.organism_classification Salinity 030104 developmental biology chemistry Biochemistry Polyamine 010606 plant biology & botany |
| Zdroj: | Plant Physiology and Biochemistry. 116:9-17 |
| ISSN: | 0981-9428 |
| DOI: | 10.1016/j.plaphy.2017.04.024 |
| Popis: | Polyamines (PAs) such as spermidine (Spd) and spermine (Spm) are small ubiquitous polycationic compounds that contribute to plant adaptation to salt stress. The positive effect of PAs has been associated to a cross-talk with other anti-stress hormones such as brassinosteroids (BRs). In this work we have studied the effects of exogenous Spd and Spm pre-treatments in the response to salt stress of the symbiotic interaction between Medicago truncatula and Sinorhizobium meliloti by analyzing parameters related to nitrogen fixation, oxidative damage and cross-talk with BRs in the response to salinity. Exogenous PAs treatments incremented the foliar and nodular Spd and Spm content which correlated with an increment of the nodule biomass and nitrogenase activity. Exogenous Spm treatment partially prevented proline accumulation which suggests that this polyamine could replace the role of this amino acid in the salt stress response. Additionally, Spd and Spm pre-treatments reduced the levels of H 2 O 2 and lipid peroxidation under salt stress. PAs induced the expression of genes involved in BRs biosynthesis which support a cross-talk between PAs and BRs in the salt stress response of M. truncatula-S. meliloti symbiosis. In conclusion, exogenous PAs improved the response to salinity of the M. truncatula-S. meliloti symbiosis by reducing the oxidative damage induced under salt stress conditions. In addition, in this work we provide evidences of the cross-talk between PAs and BRs in the adaptive responses to salinity. |
| Databáze: | OpenAIRE |
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