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Differentiation of initial cells in the root meristem. Seedlings of wild-type (A) and transgenic line S8 grown on a medium containing 1 μM DEX for 24 h (B) and 48 h (C). The luciferase line (Luc211) treated with 10 μM DEX for 53 h (D) is also shown. Starch granules were visualized in columella cells. Arrows indicate the columella initials abutting the QC. The cortical initials of transgenic plant (B) were periclinally divided as indicated by white arrowheads. (Bar = 25 μm.)
