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In rice, early embryogenesis includes establishment of three axes, namely apical?basal, radial, and dorsal?ventral axes to further develelopment as a globular embryo. Radial symmetry disappears when organ differentiation begins at specific regions in the globular embryo. Rice embryos complete all morphogenetic events within nine days under normal conditions (Ito et al., 2002; 2004). Hundreds of genes specifically express during different stages of embryo development but regulatory events during embryogenesis are not well known in rice. It is assumed that molecular mechanisms controlling the embryo pathway are probably conserved between monocot and dicot species, at least to some extent (Guo et al., 2013).
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