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Fig. 9. Relationship between SHR movement and competence to respond to SHR in
regulating root radial patterning. Movement of SHR protein (asterisks) from
the stele is limited to the adjacent layer (red arrows), while the competence
to respond to SHR extends beyond the zone of movement. Cells that are
competent to respond to SHR-mediated cell specification are rendered in green
(cortex competence has yet to be directly tested); initial cells competent to
respond to SHR-mediated cell periclinal divisions are rendered in yellow. The
fact that competence to respond to SHR exists outside of the zone of SHR
movement highlights the crucial role of regulated SHR movement in root radial
patterning. in, initial; ep, epidermis; co, cortex; en, endodermis; st, stele;
LRC, lateral root cap.
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