A plant microRNA regulates the adaptation of roots to drought stress

► The Arabidopsis mutant fry1 is sensitive to ABA in the inhibition of lateral root growth and has a higher level of miR393. ► ABA decreases the expression of the wild-type but not miR393-resistant AFB2. ► ABA or osmotic stress no longer inhibits lateral root growth of miR393-resistant plants. Plant...

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Bibliographic Details
Published in:FEBS letters 2012-06, Vol.586 (12), p.1742-1747
Main Authors: Chen, Hao, Li, Zhuofu, Xiong, Liming
Format: Article
Language:English
Subjects:
ABA
Abscisic acid
Abscisic Acid - physiology
Adaptation, Physiological - genetics
AFB
Arabidopsis - genetics
Arabidopsis - growth & development
Arabidopsis - physiology
Arabidopsis Proteins - genetics
Arabidopsis Proteins - metabolism
Auxin
Auxin-binding F-box
Base Pairing
Base Sequence
beta-glucuronidase
Droughts
F-Box Proteins - genetics
F-Box Proteins - metabolism
Gene Expression Regulation, Plant
GUS
Lateral root
MicroRNA
MicroRNAs - physiology
MS salt
Murashige and Skoog salt
Osmotic Pressure
Osmotic stress
PEG
Plant Proteins - genetics
Plant Proteins - metabolism
Plant Roots - genetics
Plant Roots - growth & development
Plant Roots - physiology
Plants, Genetically Modified
polyethylene glycol
Receptors, Cell Surface - genetics
Receptors, Cell Surface - metabolism
RNA Interference
RNA Stability
RNA, Messenger - genetics
RNA, Messenger - metabolism
Signal Transduction
Stress, Physiological - genetics
TIR1
transport inhibitor response 1
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Summary:► The Arabidopsis mutant fry1 is sensitive to ABA in the inhibition of lateral root growth and has a higher level of miR393. ► ABA decreases the expression of the wild-type but not miR393-resistant AFB2. ► ABA or osmotic stress no longer inhibits lateral root growth of miR393-resistant plants. 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.
ISSN:0014-5793
1873-3468
DOI:10.1016/j.febslet.2012.05.013