Figure 4.

Appearance of Complex PDs in Anisocytic Complexes.

(A) Asymmetric division of a single epidermal precursor (green) gives rise to two daughter cells, the smaller of which (yellow) undergoes further asymmetric division to give rise to a cell (orange) that will form the precursor of the meristemoid cell (red). Division of this cell gives rise to the guard cells.

(B) Early appearance in the leaf epidermis of complex PDs (green) occurs in anisocytic complexes adjacent to guard cells. Bar = 50 μm.

(C) Representation, based on (A), of the relative age of cells in the anisocytic complexes. (1) Anisocytic-anisocytic interface, (2) anisocytic-pavement interface, and (3) pavement-pavement interface. The oldest pavement epidermal cells are shown in white.

(D) Densities of complex PDs associated with different interfaces of the anisocytic complex.