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Ethylene‐induced microtubule reorientation is essential for fast inhibition of root elongation in Arabidopsis
Author(s) -
Wang Yichuan,
Ji Yusi,
Fu Ying,
Guo Hongwei
Publication year - 2018
Publication title -
journal of integrative plant biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.734
H-Index - 83
eISSN - 1744-7909
pISSN - 1672-9072
DOI - 10.1111/jipb.12666
Subject(s) - microtubule , elongation , arabidopsis , ethylene , microbiology and biotechnology , auxin , biophysics , chemistry , lateral root , biology , biochemistry , materials science , gene , mutant , metallurgy , ultimate tensile strength , catalysis
Microtubule reorientation is a long‐standing observation that has been implicated in regulating the inhibitory effect of ethylene on axial elongation of plant cells. However, the signaling mechanism underlying ethylene‐induced microtubule reorientation has remained elusive. Here, we reveal, by live confocal imaging and kinetic root elongation assays, that the time courses of ethylene‐induced microtubule reorientation and root elongation inhibition are highly correlated, and that microtubule reorientation is required for the full responsiveness of root elongation to ethylene treatment. Our genetic analysis demonstrated that the effect of ethylene on microtubule orientation and root elongation is mainly transduced through the canonical linear ethylene signaling pathway. By using pharmacological and genetic analyses, we demonstrate further that the TIR1/AFBs‐Aux/IAAs‐ARFs auxin signaling pathway, but not the ABP1‐ROP6‐RIC1 auxin signaling branch, is essential for ethylene‐induced microtubule reorientation and root elongation inhibition. Together, these findings offer evidence for the functional significance and elucidate the signaling mechanism for ethylene‐induced microtubule reorientation in fast root elongation inhibition in Arabidopsis .