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Jasmonic acid inhibits auxin-induced lateral rooting independently of the CORONATINE INSENSITIVE 1 receptor
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Ishimaru, Yasuhiro, Hayashi, Ken-ichiro, Suzuki, Takeshi, Fukaki, Hidehiro, Prusińska, Justyna, Meesters, Christian, Quareshy, Mussa, Egoshi, Yuusuke, Matsuura, Hideyuki, Takahashi, Kosaku, Kato, Nobuki, Kombrink, Erich, Napier, R. (Richard), Hayashi, Kengo and Ueda, Minoru (2018) Jasmonic acid inhibits auxin-induced lateral rooting independently of the CORONATINE INSENSITIVE 1 receptor. Plant Physiology, 177 (4). pp. 1704-1716. doi:10.1104/pp.18.00357 ISSN 0032-0889.
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Official URL: http://dx.doi.org/10.1104/pp.18.00357
Abstract
Plant root systems are indispensable for water uptake, nutrient acquisition, and anchoring plants in the soil. Previous studies using auxin inhibitors definitively established that auxin plays a central role regulating root growth and development. Most auxin inhibitors affect all auxin signaling at the same time, which obscures an understanding of individual events. Here, we report that jasmonic acid (JA) functions as a lateral root (LR)-preferential auxin inhibitor in Arabidopsis (Arabidopsis thaliana) in a manner that is independent of the JA receptor, CORONATINE INSENSITIVE1 (COI1). Treatment of wild-type Arabidopsis with either (−)-JA or (+)-JA reduced primary root length and LR number; the reduction of LR number was also observed in coi1 mutants. Treatment of seedlings with (−)-JA or (+)-JA suppressed auxin-inducible genes related to LR formation, diminished accumulation of the auxin reporter DR5::GUS, and inhibited auxin-dependent DII-VENUS degradation. A structural mimic of (−)-JA and (+)-coronafacic acid also inhibited LR formation and stabilized DII-VENUS protein. COI1-independent activity was retained in the double mutant of transport inhibitor response1 and auxin signaling f-box protein2 (tir1 afb2) but reduced in the afb5 single mutant. These results reveal JAs and (+)-coronafacic acid to be selective counter-auxins, a finding that could lead to new approaches for studying the mechanisms of LR formation.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Life Sciences (2010- ) | ||||||
| Journal or Publication Title: | Plant Physiology | ||||||
| Publisher: | American Society of Plant Biologists | ||||||
| ISSN: | 0032-0889 | ||||||
| Official Date: | 7 August 2018 | ||||||
| Dates: |
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| Volume: | 177 | ||||||
| Number: | 4 | ||||||
| Page Range: | pp. 1704-1716 | ||||||
| DOI: | 10.1104/pp.18.00357 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||
| Date of first compliant deposit: | 23 January 2019 |
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