Journal
JOURNAL OF PLANT PHYSIOLOGY
Volume 170, Issue 9, Pages 874-877Publisher
ELSEVIER GMBH, URBAN & FISCHER VERLAG
DOI: 10.1016/j.jplph.2013.01.008
Keywords
Abiotic stress; Medicago truncatula; Proline; Seedling; Stress associated protein
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Funding
- QUALISEM
- Region Pays de la Loire, France
- University of Angers
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Stress associated proteins (SAP) have been already reported to play a role in tolerance acquisition of some abiotic stresses. In the present study, the role of MtSAP1 (Medicago truncatula) in tolerance to temperature, osmotic and salt stresses has been studied in tobacco transgenic seedlings. Compared to wild type, MtSAP1 overexpressors were less affected in their growth and development under all tested stress conditions. These results confirm that MtSAP1 is involved in the response processes to various abiotic constraints. In parallel, we have performed studies on an eventual link between MtSAP1 overexpression and praline, a major player in stress response. In an interesting way, the results for the transgenic lines did not show any increase of praline content under osmotic and salt stress, contrary to the WT which usually accumulated praline in response to stress. These data strongly suggest that MtSAP1 is not involved in signaling pathway responsible for the proline accumulation in stress conditions. This could be due to the fact that the overexpression of MtSAP1 provides sufficient tolerance to seedlings to cope with stress without requiring the free praline action. Beyond that, the processes by which the MtSAP1 overexpression lead to the suppression of praline accumulation will be discussed in relation with data from our previous study involving nitric oxide. (c) 2013 Elsevier GmbH. All rights reserved.
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