PIN-mediated polar auxin transport facilitates root obstacle avoidance

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Title
PIN-mediated polar auxin transport facilitates root obstacle avoidance
Author(s)
Hyo Jun LeeHyun Soon KimJeong Mee ParkHye Sun ChoJae Heung Jeon
Bibliographic Citation
New Phytologist, vol. 225, no. 3, pp. 1285-1296
Publication Year
2020
Abstract
Plants sense mechanical stimuli to recognise nearby obstacles and change their growth patterns to adapt to the surrounding environment. When roots encounter an obstacle, they rapidly bend away from the impenetrable surface and find the edge of the barrier. However, the molecular mechanisms underlying root-obstacle avoidance are largely unknown. Here, we demonstrate that PIN-FORMED (PIN)-mediated polar auxin transport facilitates root bending during obstacle avoidance. We analysed two types of bending after roots touched barriers. In auxin receptor mutants, the rate of root movement during first bending was largely delayed. Gravity-oriented second bending was also disturbed in these mutants. The reporter assays showed that asymmetrical auxin responses occurred in the roots during obstacle avoidance. Pharmacological analysis suggested that polar auxin transport mediates local auxin accumulation. We found that PINs are required for auxin-assisted root bending during obstacle avoidance. We propose that rapid root movement during obstacle avoidance is not just a passive but an active bending completed through polar auxin transport. Our findings suggest that auxin plays a role in thigmotropism during plant-obstacle interactions.
Keyword
obstacle avoidancePINpolar auxin transportroot bendingthigmotropism
ISSN
0028-646X
Publisher
Wiley
DOI
http://dx.doi.org/10.1111/nph.16076
Type
Article
Appears in Collections:
1. Journal Articles > Journal Articles
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