Figure 4

Comparison of the molecular and morphological features of stomatal development in Arabidopsis and representatives of the grasses and mosses for which molecular data exist. Presentation of a simplified stomatal lineage displaying only cell identities (in the same color codes as Figure 3), with the addition of blue to mark the subsidiary cells in monocots. Genetic regulators of the processes are included at their points of action, with black text indicating that there is direct functional evidence supporting the placement and grey text representing inferences from cross-species complementation tests. The curved arrow in the dicot lineage represents the continued asymmetric amplifying divisions made by meristemoids