Maternally-contributed central cell peptide regulating suspensor development and correct auxin distribution in early developing embryos. Expressed exclusively in ovule embryo sacs and in early developing endosperms. Primarily expressed in the central cell gamete of nonfertilized ovules, which upon fertilization gives rise to the endosperm, and later in the micropylar endosperm, which surrounds the embryo. No visible phenotype, due to redundancy with ESF1.1 and ESF1.2. Simultaneous down-regulation of all 3 genes by RNAi induces embryo abnormalities. Belongs to the MEG family.