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Fig. 7. Model for lg1 function in leaf morphogenesis. (A) Cartoon of
wild-type leaf illustrating distal blade (green) and proximal sheath (blue)
separated by ligule and auricle (red). (B) In the absence of lg1,
ligule and auricle are deleted, the blade-sheath boundary is shifted distally,
and the base of the blade is narrower than in wild-type leaves. (C)
Wab1 disrupts proximodistal patterning and restricts lateral growth
of the blade. Misexpression of lg1 in Wab1 leaves results in
ectopic ligule and auricle, and partially compensates for the narrow leaf
phenotype at the base of the blade. The lateral signalling function of
lg1 permits some recovery of proximodistal patterning at the margins
of Wab1 leaves. (D) In the absence of lg1, Wab1 leaves never
establish blade at the margins and are extremely narrow.
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