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A plant microRNA regulates the adaptation of roots to drought stress
Author(s) -
Chen Hao,
Li Zhuofu,
Xiong Liming
Publication year - 2012
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/j.febslet.2012.05.013
Subject(s) - auxin , abscisic acid , osmotic shock , biology , arabidopsis , lateral root , microbiology and biotechnology , adaptation (eye) , botany , gene , biochemistry , neuroscience , mutant
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.