Transcriptional regulator that specifically binds 5'-GATA-3' or 5'-GAT-3' motifs within gene promoters. Regulates both flower and shoot apical meristem (SAM) development, especially for establishing organ boundaries in shoots and flowers, probably by controlling the number and position of WUS-expressing cells (PubMed:23335616, PubMed:25077795). Forms heterodimers with GATA18. Expressed throughout the inflorescence meristem (IM) and early stages of floral primordia. In developing flowers, restricted to the innert hree whorls, speci fi cally in the petals, stamens, and carpels. Within the stamens, mostly detected in the anther locules as well as in the vascular strands. In carpels, mainly present in ovules. Repressed by HAN. Effects on sepal fusion, petal number, fertility defects, and carpel abnormality. Belongs to the type IV zinc-finger family. Class B subfamily.