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Remorin proteins (REMs) form a plant-specific protein family, with some REMs being responsive to abiotic stress. However, the precise functions of REMs in abiotic stress tolerance are not clear. In this study, we identified 11 remorin genes from foxtail millet ( Setaria italica ) and cloned a remorin gene,  SiREM6 , for further investigation. The transcript level of  SiREM6  was increased by high salt stress, low temperature stress and abscisic acid (ABA) treatment, but not by drought stress. The potential oligomerization of SiREM6 was examined by negative staining electron microscopy. The overexpression of  SiREM6  improved high salt stress tolerance in transgenic  Arabidopsis  at the germination and seedling stages as revealed by germination rate, survival rate, relative electrolyte leakage and proline content. The  SiREM6  promoter contains two dehydration responsive elements (DRE) and one ABA responsive element (ABRE). An ABA responsive DRE-binding transcription factor,  SiARDP , and an ABRE-binding transcription factor,  SiAREB1 , were cloned from foxtail millet. SiARDP could physically bind to the DREs, but SiAREB1 could not. These results revealed that  SiREM6  is a target gene of SiARDP and plays a critical role in high salt stress tolerance.

A Remorin Gene SiREM6, the Target Gene of SiARDP, from Foxtail Millet (Setaria italica) Promotes High Salt Tolerance in Transgenic Arabidopsis