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Figure 5


Fig. 5. Apical initials are not permanent. (A) Schematic of a shoot sector that first occupies segments of the front and back of the shoot, then occupies half of the shoot, and finally takes over the whole shoot. (B-E) Hypothetical patterns of inheritance of the mutant sector if two apical initials are functional throughout shoot growth (B,C), or if the number of initials decreases from two to one (D,E). Initials are indicated with an asterisk and the direction of cell division with arrows; the jagged arrow indicates an X-ray-induced aneuploidy event in one initial; light grey depicts au/+ tissue and dark grey depicts +/-tissue. Cell patterns in the surface (B,D) and subtending (C,E) layers of the apex are depicted.





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