title: The durum wheat plasma membrane Na+/H+antiporter SOS1 is involved in oxidative stress response.
abstract: We have shown previously that the durum wheat TdSOS1 excludes Na+and Li+ions outside cells. Moreover, this protein is activated by Arabidopsis kinase SOS2 through phosphorylation. The elimination of both SOS2 phosphorylation sites and the auto-inhibitory domain produces a hyperactive TdSOS1∆972 form, which have a maximal activity independent from the regulatory SOS2/SOS3 complex. We demonstrated that the expression of TdSOS1 enhances salt tolerance of the transgenic Arabidopsis plants. In this study, we analyzed the response to H2O2-induced oxidative stress of the transgenic Arabidopsis expressing one of the two TdSOS1 forms. Firstly, we showed that the exogenous H2O2treatment leads to an accumulation of SOS1 transcripts in leaves and roots of the durum wheat and also in the transgenic plants. These transgenic plants showed significant oxidative stress tolerance compared to control plants, especially the plants expressing the hyperactive form. This tolerance was manifested by high proline accumulation and low malonyldialdehyde (MDA), O2˙-and H2O2contents. Furthermore, the activities of three essential ROS scavenging enzymes (SOD, CAT, and POD) were higher in the transgenic plants under oxidative stress, as compared to control plants. Taken together, these data suggested that TdSOS1 plays a crucial role in response to oxidative stress.
authors.affiliation: Biotechnology and Plant Improvement Laboratory, Centre of Biotechnology of Sfax (CBS)/University of Sfax, Route Sidi Mansour Km 6, B.P'1177', 3018, Sfax, Tunisia.
authors.forename: Kaouthar
authors.initials: K
authors.lastname: Feki
authors.affiliation: Biotechnology and Plant Improvement Laboratory, Centre of Biotechnology of Sfax (CBS)/University of Sfax, Route Sidi Mansour Km 6, B.P'1177', 3018, Sfax, Tunisia.
authors.forename: Sana
authors.initials: S
authors.lastname: Tounsi
authors.affiliation: Biotechnology and Plant Improvement Laboratory, Centre of Biotechnology of Sfax (CBS)/University of Sfax, Route Sidi Mansour Km 6, B.P'1177', 3018, Sfax, Tunisia.|International center for Biosaline Agriculture (ICBA), P.O. Box 14660, Dubai, UAE.
authors.forename: Khaled
authors.initials: K
authors.lastname: Masmoudi
authors.affiliation: Biotechnology and Plant Improvement Laboratory, Centre of Biotechnology of Sfax (CBS)/University of Sfax, Route Sidi Mansour Km 6, B.P'1177', 3018, Sfax, Tunisia. faical.brini@cbs.rnrt.tn.
authors.forename: Faiçal
authors.initials: F
authors.lastname: Brini
mesh_terms: D017360:Arabidopsis / Q000235:genetics / Q000378:metabolism; D002374:Catalase / Q000235:genetics / Q000378:metabolism; D015870:Gene Expression; D018506:Gene Expression Regulation, Plant; D010084:Oxidation-Reduction; D018384:Oxidative Stress; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D018517:Plant Roots / Q000378:metabolism; D018520:Plant Shoots / Q000378:metabolism; D030821:Plants, Genetically Modified / Q000235:genetics / Q000378:metabolism; D017382:Reactive Oxygen Species; D017923:Sodium-Hydrogen Exchangers / Q000502:physiology*; D013482:Superoxide Dismutase / Q000235:genetics / Q000378:metabolism; D014908:Triticum / Q000378:metabolism*
chemical_list: D010940:Plant Proteins; D017382:Reactive Oxygen Species; D017923:Sodium-Hydrogen Exchangers; D002374:Catalase; D013482:Superoxide Dismutase
keywords: Antioxidant enzymes; Durum wheat; Hyperactive SOS1 form; Na+/H+ antiporter SOS1; Oxidative stress; Reactive oxygen species