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Publikationen - Molekulare Signalverarbeitung

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Schulze, A.; Zimmer, M.; Mielke, S.; Stellmach, H.; Melnyk, C. W.; Hause, B.; Gasperini, D. Wound-induced shoot-to-root relocation of JA-Ile precursors coordinates Arabidopsis growth Mol Plant (2019) DOI: 10.1016/j.molp.2019.05.013

Multicellular organisms rely upon the movement of signaling molecules across cells, tissues and organs to communicate among distal sites. In plants, localized leaf damage activates jasmonate (JA)-dependent transcriptional reprogramming in both harmed and unharmed tissues. Although previous evidence indicated that JA species can translocate from damaged into distal sites, the identity of the mobile compound(s), the tissues through which they translocate and the impact of their relocation remain unknown. Here, we found that following shoot wounding, the relocation of endogenous jasmonates through the phloem is essential to initiate JA signaling and stunt growth in unharmed roots of Arabidopsis thaliana. By coupling grafting experiments to hormone profiling, we uncovered that the hormone precursor OPDA and its derivatives, but not the bioactive JA-Ile conjugate, translocate from wounded shoots into undamaged roots. Upon root relocation, the mobile precursors cooperatively regulated JA responses through their conversion into JA-Ile and JA signaling activation. Collectively, our findings demonstrate the existence of long-distance translocation of endogenous OPDA and its derivatives which serve as communication molecules to coordinate shoot-to-root responses, and highlight the importance of a controlled re-distribution of hormone precursors among organs during plant stress acclimation.
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