May regulate cell proliferation and plant growth. Binds to the DNA in the promoter region of WAXY containing the sequence 5'-ACGCACGCTAACGTGA-3'. Expressed in tissues with high cell division activities: in root tips, stem node, panicle, flower and immature seed. Weakly expressed in root and leaf. Expressed in developing panicle, and in developing seed up to 15 days after flowering. Expression is reduced in the late stages of seed development.