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Figure 1


Fig. 1. Prepupal wing disc development. (A) Confocal section of a third-instar wing disc stained for filamentous actin with Rhodamine-phalloidin showing the apical region of the wing disc epithelium. The white dotted line outlines the central fold of the disc, the wing pouch, which will generate the wing blade. (B-D) Longitudinal sections of discs at 0, 2 and 4 hour after puparium (AP) formation that approximately correspond to the vertical white line in A. Arrowheads point to the wing pouch area. (B) At 0 hours, AP formation the wing disc is made up of a columnar epithelium (ce) that is continuous with the squamous epithelium of the peripodial membrane (pm). At this stage, a thin basal lamina (bl) surrounds the basal surface of disc cells (inset in B). (C) Folding of the wing pouch starts as cells in the wing margin (wm) shorten and separate from the basal lamina (inset in C). (D) Unfolding of the periphery of the wing pouch brings dorsal (d) and ventral (v) surfaces together, and simultaneously changes in cell shape from a columnar to a cuboidal morphology produce an increase in surface area.





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