Involved in the maintenance of the floral meristem and of the shoot apical meristem in the vegetative phase. Suppresses the fon2 mutation and acts independently of FON1. In Oryza sativa subsp. japonica, the protein has a single amino acid substitution at the putative processing site of the signal peptide and is inactive. Expressed in all aerial apical meristems, including the floral and inflorescence meristems in the reproductive phase and the shoot apical meristem in the vegetative phase. Also detected in the primordia of lateral organs such as the leaf and the floral organs. Belongs to the CLV3/ESR signal peptide family.