Transcription repressor that binds specific DNA sequence such as the GT-box-like motif 5'-CGTGATT-3' in the AT2S3 promoter. Negative regulator of seed maturation genes during seed germination and seedling development. May target GT-box-containing embryonic genes by competing with the binding of transcriptional activators to this promoter region (PubMed:19155348). Contributes to the maintenance and control of seed filling (PubMed:22231199) and may repress the maturation program during early embryogenesis (PubMed:21330492). Induced by seed imbibition with a peak after 1 hour and then steadily decreases to be barely detectable at day 3. Reduced growth of leaves, petioles, stems and siliques. Delayed flowering.