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. Author manuscript; available in PMC: 2017 Nov 1.
Published in final edited form as: Dev Biol. 2016 Mar 17;419(1):156–164. doi: 10.1016/j.ydbio.2016.03.020

Figure 2.

Figure 2

Auxin flow in the root and shoot. (a-d) Auxin maxima are shown in bright green. (a) Transverse section of the Arabidopsis root, with different cell types indicated. (b) Diagram indicating the flow of auxin in the primary root and the PINs primarily responsible for this movement. The meristematic zone and elongation zone of the root are divided by dashed lines. (c) The shoot apical meristem. Auxin transported by PIN1 generates maxima triggering the formation of primordia. CZ: central zone, RM: rib meristem, PZ: peripheral zone. (d) Top-down view of an Arabidopsis inflorescence meristem, showing the sites of developing primordia (P). PIN1 is localized towards the site of incipient primordia (P0), leading to high local concentrations of auxin.