May play a role in floral meristem development and maintenance of stamens, rather than in determining polarity in floral organs. Preferentially expressed in flowers. Expressed in leaf blades and leaf sheaths. Does not show polar expression pattern. Detected throughout panicle development with the strongest expression in immature panicles, and weakest in mature panicles. Abundantly found in the stamen and carpel primordia of young spikelets. YAB1, from cultivar indica Minghui 63, was shown by Dai et al (PubMed:17369428) to be involved in regulation of gibberellin (GA) biosynthesis, to bind to the 5'-TCTGTTA-3' GA-responsive element of gibberellin 3-beta-dioxygenase 2 (GA3ox2) promoter and be transiently induced by GA in seedlings. It has to be pointed out that this YAB1 sequence differs from cultivar japonica nipponbare sequence by seven amino acids, of which four are located in the zinc finger domain. Belongs to the YABBY family.