Non functional suppressor of the fon2 mutation. In Oryza sativa subsp. japonica, the protein has a single amino acid substitution at the putative processing site of the signal peptide while in all the other varieties/species of domesticated and wild rice tested the protein is functional. 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. Due to an amino acid substitution at the processing site, the putative signal sequence is probably not cleaved and the protein is inactive.