Journal
FEBS LETTERS
Volume 586, Issue 12, Pages 1742-1747Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.febslet.2012.05.013
Keywords
MicroRNA; Abscisic acid; Auxin; Lateral root; Osmotic stress
Funding
- National Science Foundation [0446359]
- USDA-NRI [2004-02111]
- KAUST
- Direct For Biological Sciences
- Division Of Integrative Organismal Systems [0446359] Funding Source: National Science Foundation
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Plants tend to restrict their horizontal root proliferation in response to drought stress, an adaptive response mediated by the phytohormone abscisic acid (ABA) in antagonism with auxin through unknown mechanisms. Here, we found that stress-regulated miR393-guided cleavage of the transcripts encoding two auxin receptors, TIR1 and AFB2, was required for inhibition of lateral root growth by ABA or osmotic stress. Unlike in the control plants, the lateral root growth of seedlings expressing miR393-resistant TIR1 or AFB2 was no longer inhibited by ABA or osmotic stress. Our results indicate that miR393-mediated attenuation of auxin signaling modulates root adaptation to drought stress. (c) 2012 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
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