Wound-Induced Shoot-to-Root Relocation of JA-Ile Precursors Coordinates Arabidopsis Growth  

作　　者：Adina Schulze Marlene Zimmer Stefan Mielke Hagen Stellmach Charles WMelnyk Bettina Hause Debora Gasperini 

机构地区：[1]Department of Molecular Signal Processing,Leibniz Institute of Plant Biochemistry,Weinberg 3,06120 Halle(Saale),Germany [2]Department of Cell and Metabolic Biology,Leibniz Institute of Plant Biochemistry,06120 Halle(Saale),Germany [3]Department of Plant Biology.Swedish University of Agricultural Sciences,75651 Uppsala,Sweden

出　　处：《Molecular Plant》2019年第10期1383-1394,共12页分子植物（英文版）

摘　　要：Multicellular organisms rely on the movement of signaling molecules across cells,tissues,and organs to communicate among distal sites.In plants,localized leaf damage activates jasmonic acid(JA)-dependent transcriptional reprogramming in both harmed and unharmed tissues.Although it has been 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 effect 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 employing grafting experiments and hormone profiling,we uncovered that the hormone precursor cis-12-oxo-phytodienoic acid(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 mobile molecules to coordinate shoot-to-root responses,and highlight the importance of a controlled redistribution of hormone precursors among organs during plant stress acclimation.

关 键 词：GRAFTING JASMONATE OPDA PHLOEM PHYTOHORMONE 

分 类 号：O62[理学—有机化学]