Abstract
Background and aims
Polyamines are cationic molecules that play an important role in the plant response to environmental stresses. The aim of this work is to determine the role of these compounds in the response to salinity of Medicago sativa plants in symbiosis with the soil bacteria Sinorhizobium meliloti.
Methods
M. sativa plants inoculated with S. meliloti were subjected to 100 and 150 mM NaCl treatments. The concentration of nodular polyamines was determined in relation to the nitrogen fixation parameters, proline accumulation, and oxidative damage. In addition, polyamines concentrations were analyzed in different nodular fractions as well as the effect of exogenous polyamines in the nodulation response.
Results
The concentration of nodular polyamines decreased by the salinity in correlation with the nitrogenase activity after 2 and 4 weeks of salt treatment while spermine accumulated after 6 weeks. On the contrary, proline accumulation was induced by the salinity at all time points. The analysis of different nodular fractions showed the highest polyamines concentration in bacteroids being homospermidine the most abundant.
Conclusion
Proline accumulation had prevalence over polyamines at the earliest response to salinity probably due to nitrogen limitation under salt stress conditions and the existence of a common precursor for both compounds in the nodule. Nevertheless, after long salt exposure, spermine was also accumulated. The analysis of different nodular fractions indicated the bacteroidal origin of polyamines in nodules being homoespermidine, one of the most abundant.
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Abbreviations
- PAs:
-
Polyamines
- Put:
-
Putrescine
- Sdp:
-
Spermidine
- Spm:
-
Spermine
- Homspd:
-
Homospermidine
- Pro:
-
Proline
- DAO:
-
Diamine oxidase
- PAO:
-
Polyamine oxidase
- MDA:
-
Malondialdehyde
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Acknowledgments
This work was supported by the Andalusian Research Program (AGR-139) and the Spanish Ministry of Science and Technology AGL2009-09223.
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López-Gómez, M., Hidalgo-Castellanos, J., Iribarne, C. et al. Proline accumulation has prevalence over polyamines in nodules of Medicago sativa in symbiosis with Sinorhizobium meliloti during the initial response to salinity. Plant Soil 374, 149–159 (2014). https://doi.org/10.1007/s11104-013-1871-1
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DOI: https://doi.org/10.1007/s11104-013-1871-1