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. 2017 Jul 27;8:1304. doi: 10.3389/fpls.2017.01304

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Copyright © 2017 Singh, Gupta and Laxmi.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Auxin redistribution upon a gravity stimulus. Auxin distribution (blue) and direction of flow (depicted by arrows). Auxin from the shoot to the root tip (red arrows) is mediated by AUX1 and PIN2. Auxin flow is further distributed through the vascular tissue to the columella cells (yellow arrows). PIN3 is localized in the columella cells and gravity stimulus induces more PIN3 localization (orange) to the lower side of columella cells redirecting auxin flow to the lower side of the root (Friml et al., 2002). Asymmetric localization of PIN2 upon gravity reorientation too helps auxin flow at the lower side of gravistimulated root mainly directed towards the elongation zone, where it inhibits elongation at the lower side of the root and causes root bending.