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Soil salinization is a resource and ecological problem in the world.  Thellungiella salsuginea  is becoming a new model plant because it resembles its relative species,  Arabidopsis thaliana , in small genome and short life cycle. It is highly tolerant to salinity and drought stresses. Ascorbate peroxidase (APX) is an enzyme that clears H 2 O 2  in plants. The function and molecular and regulation mechanisms of APX in  T .  salsuginea  have rarely been reported. In this study, an APX gene,  TsApx6 , was cloned from  T .  salsuginea  and its responses to abiotic stresses in transgenic  Arabidopsis  were studied. Under high salinity treatment, the expression of  TsApx6  was significantly induced. Under drought treatment, overexpression of  TsApx6  increased the survival rate and reduced leaf water loss rate in  Arabidopsis . Compared to the wild type plants, high salinity treatment reduced the concentrations of MDA, H 2 O 2  and proline but elevated the activities of APX, GPX, CAT and SOD in the  TsApx6 -overexpressing plants. Meanwhile, germination rate, cotyledon greening, and root length were improved in the transgenic plants compared to the wild type plants under salt and water deficit conditions. Based on these findings,  TsApx6  has an important function in the resistance of plants to certain abiotic stresses. The  TsApx6  promoter sequence was obtained using Genome Walking technology. Bioinformatics analysis indicated that it contains some  cis -acting elements related to stress response. The treatments of salt, dehydration, and ABA induced the expression of  Gus  gene under the regulation of the  TsApx6  promoter. Mutation analysis showed that the MBS motif present in the  TsApx6  promoter might be a key negative regulatory element which has an important effect on the growth and developmental process of plants.

plos one

The Functional and Regulatory Mechanisms of the Thellungiella salsuginea Ascorbate Peroxidase 6 (TsAPX6) in Response to Salinity and Water Deficit Stresses