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Functional mechanism study of the allelochemical myrigalone A identifies a group of ultrapotent inhibitors of ethylene biosynthesis in plants

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Plant Communications 2024年第6期5卷 246-262页

作者： George Heslop-Harrison Kazumi Nakabayashi Ana Espinosa-Ruiz Francesca Robertson Robert Baines Christopher R.L.Thompson Katrin Hermann David Alabadí gerhard leubner-metzger Robin S.B.Williams Centre for Biomedical Sciences Department of Biological SciencesRoyal Holloway University of LondonEgham TW200EXUK Centre for Plant Molecular Sciences Department of Biological SciencesRoyal Holloway University of LondonEgham TW200EXUK Instituto de Biología Molecular y Celular de Plantas(CSIC-UPV) 46022 ValenciaSpain Centre for Life’s Origins and Evolution Department of GeneticsEvolution and EnvironmentUniversity College LondonLondonUK Syngenta Crop Protection AGSteinSwitzerland

Allelochemicals represent a class of natural products released by plants as root,leaf,and fruit exudates that interfere with the growth and survival of neighboring *** how allelochemicals function to regulate plant responses may provide valuable new approaches to better control plant *** such allelochemical,Myrigalone A(MyA)produced by Myrica gale,inhibits seed germination and seedling growth through an unknown ***,we investigate MyA using the tractable modelDictyostelium discoideum and reveal that its activity depends on the conserved homolog of the plant ethylenesynthesis protein 1-aminocyclopropane-1-carboxylic acid oxidase(ACO).Furthermore,in silico modeling predicts the direct binding of MyA to ACO within the catalytic *** ***,ablation of ACO mimics the MyA-dependent developmental delay,which is partially restored by exogenous ethylene,and MyA reduces ethylene *** Arabidopsis thaliana,MyA treatment delays seed germination,and this effect is rescued by exogenous *** also mimics the effect of established ACO inhibitors on root and hypocotyl extension,blocks ethylenedependent root hair production,and reduces ethylene ***,in silico binding analyses identify a rangeof highlypotentethylene inhibitorsthatblock ethylene-dependent responseand reduce ethyleneproduction in ***,we demonstrate a molecular mechanism by which the allelochemical MyA reduces ethylene biosynthesis and identify a range of ultrapotent inhibitors of ethylene-regulated responses.

关键词： 1-aminocyclopropane-1-carboxylic acid ACC ACC oxidase ACO allelochemicals ethylene synthesis inhibitors structure-activity relationship

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