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. 2020 Nov 23;33(1):104–128. doi: 10.1093/plcell/koaa008

Figure 10.

Figure 10

A proposed model for the regulatory network of ZmABI19 in seed development. O2 begins to be transcribed at 8 DAP. At this time, ZmABI19 binds to the two RY motifs of the O2 promoter to initiate O2 expression. When entering the endosperm filling stage, the expression of ZmABI19 decreases in the endosperm. Instead, O2 binds to the O2 box to promote auto-activation. ZmABI19 directly regulates other key factors in the endosperm (Pbf1, ZmbZIP22, O11, NAC130, and SWEET4c) and in the embryo (Vp1) for coordinated regulation of graining filling. ZmABI19 also regulates auxin responsive genes in early seed development.