FIGURE 6.

Hormonal regulation of CSC differentiation and COL detachment. (A) The columella (COL) is below the QC and is arranged in cell files of increasing size. The columella stem cells (CSCs) remain undifferentiated and originate COL differentiated cells that accumulate starch granules in amyloplasts. The last COL cell file is sloughed off from the root. (B) Presence of hormones in COL reported by the auxin response (DR5) and measurement of different CK types. (C) Hormone function over CSCs differentiation and COL sloughing. The comments that are nearby arrows indicate if the hormone was applied exogenously under [high] or [low] concentrations or if the regulation depends on genes that participate in hormone synthesis, transport or signaling. Dotted arrows indicate the hormonal crosstalk.