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Fig. 2. Differential surface growth at meristem-lateral organ boundaries. Scanning
electron micrograph of an Arabidopsis inflorescence, showing the
meristem in the centre and floral primordia successively initiating at its
flanks (F1,F2). (A) Plot crosses denote the directions in which the apex
surface is either minimally or maximally curved. Black crossed arms indicate a
convex surface and red crossed arms a concave one. Arm length is proportional
to the curvature in these directions. (B) A colour map of the Gaussian
curvature overlaid on the same micrograph. The colour scale indicates Gaussian
curvature values in 10–1 m–2
(Dumais and Kwiatkowska,
2002 ). Where both red and black arms form a cross, the surface is
saddle shaped and the Gaussian curvature is negative. This is seen at the
boundaries between the meristem and floral primordia. Image courtesy of Dorota
Kwiatkowska.
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