Transcription activator that recognizes the motif 5'-TAACGG-3' in the promoter of target genes (PubMed:27681170). Promotes vegetative-to-embryonic transition and the formation of somatic embryos from root explants in a WUS-independent manner (PubMed:18695688). Together with MYB118, activates the transcription of S-ACP-DES2/AAD2 and S-ACP-DES3/AAD3 thus promoting the biosynthesis of omega-7 monounsaturated fatty acid in seed endosperm (PubMed:27681170). Accumulates in reproductive organs (e.g. flowers and siliques) (PubMed:18695688, PubMed:27681170). Expressed at very low levels in vegetative organs (PubMed:27681170). Induced at the onset of the maturation phase in the endosperm at low levels in a heterogeneous repartition, particularly in the chalazal endosperm. Also detected in pollen grains. Induced by LEC2 but repressed by MYB118. Single and myb118 myb115 double mutants do not show apparent developmental abnormalities (PubMed:18695688). The endosperm oil of double mutant myb115 myb118 lacks omega-7 fatty acids (PubMed:27681170). Extended C-terminus. Truncated N-terminus.