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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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