Functions as a negative regulator of salt stress response. Functions as repressor of WRKY8 transcription factor by decreasing the DNA-binding activity of WRKY8 and acts antagonistically with WRKY8 to regulate sodium and potassium homeostasis under salt stress. Interacts (via N-terminus) with WRKY8. Highly expressed in roots and at lower levels in rosette leaves, cauline leaves, stems, flowers and siliques. By salt stress. No visible phenotype under normal growth conditions, but mutant plants show enhanced resistance to salt stress.