Journal
NATURE PLANTS
Volume 5, Issue 5, Pages 491-497Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41477-019-0408-x
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Funding
- National Natural Science Foundation of China [31630007, 31770399, 21375066]
- Strategic Priority Research Program of CAS [XDB27030103]
- Key Research Program of CAS [QYZDB-SSW-SMC010]
- Youth Innovation Promotion Association of CAS [2014241, 2014230]
- National Key Laboratory of Plant Molecular Genetics
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Wounding is the first event triggering regeneration(1-4). However, the molecular basis of wound signalling pathways in plant regeneration is largely unclear. We previously established a method to study de novo root regeneration (DNRR) in Arabidopsis thaliana(5,6), which provides a platform for analysing wounding. During DNRR, auxin is biosynthe-sized after leaf detachment and promotes cell fate transition to form the root primordium(5-7). Here, we show that jasmonates (JAs) serve as a wound signal during DNRR. Within 2 h of leaf detachment, JA is produced in leaf explants and activates ETHYLENE RESPONSE FACTOR109 (ERF109). ERF109 upregulates ANTHRANILATE SYNTHASE alpha l (ASA1)-a tryptophan biosynthesis gene in the auxin production pathway(8-10)-dependent on the pre-deposition of SET DOMAIN GROUP8 (SDG8)-mediated histone H3 lysine 36 trimethylation (H3K36me3)(11) on the ASA1 locus. After 2 h, ERF109 activity is inhibited by direct interaction with JASMONATEZIM-DOMAIN (JAZ) proteins to prevent hypersensitivity to wounding. Our results suggest that a dynamic JA wave cooperates with histone methylation to upregulate a pulse of auxin production and promote DNRR in response to wounding.
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