Fig. 6.

A model for RdDM in seed development. A model for siRNA regulation of gene (AGL) expression in the endosperm. Early in development, RdDM activity is low, spatially restricting AGL expression to the CZE. Later in development, siRNAs and the RdDM pathway are activated to silence AGL expression. Loss of the RdDM pathway results in the failure to restrict AGL expression spatially to the CZE and temporally to early stages of development. CZSC, chalazal seed coat; EP, embryo proper; PEN, peripheral endosperm; SC, distal seed coat.