Fig. 1.

Parallels between patterning mechanisms underlying integument and leaf formation. Cell outlines of longitudinal sections through: a a shoot apical meristem (SAM) with an attached leaf primordia and b an ovule with integument primordia. Domains of HD-ZIPIII, KANADI and YABBY expression are colored in red, yellow and blue, respectively; green regions indicate the combined expression of both KANADI and YABBY genes. Similar mechanisms of laminar growth underlie both leaf and integument formation, representing a recurrence of a developmental process