Acts as a negative regulator of abscisic acid (ABA) and salinity responses. Interacts with ABI5/DPBF1, AREB3/DPBF3, EEL/DPBF4, ABF1 and ABF3/DPBF5. Predominantly expressed in roots and seedlings. Up-regulated by abscisic acid (ABA) and salt. Down-regulated by cold and glucose. Exhibits insensitivity to abscisic acid (ABA) and salt. Belongs to the Ninja family.