Transcription factor that binds to the DNA G-box motif 5'-CACGTG-3' of MAN7 promoter. Involved in the positive regulation of seed germination through MAN7 gene activation. MAN7 is required for both, loosening of the micropylar endosperm, and rupture of the seed coat in germinating seeds. Forms heterodimers with BZIP1, BZIP9, BZIP10, BZIP25 and BZIP63. A number of isoforms are produced. According to EST sequences. Expressed in the micropylar endosperm and radicle tip in early germinating seeds. No visible phenotype under normal growth conditions, but seeds have decreased germination speed after imbibition, without affecting overall germination rate.