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BFP1:One of 700 Arabidopsis F-box proteins mediates degradation of JA oxidases to promote plant immunity

Molecular Plant 2024年第3期17卷 375-376页

作者： Claus Wasternack bettina hause Department of Molecular Signal Processing Leibniz Institute of Plant Biochemistry7 Weinberg 306120 Halle(Saale)Germany Department of Cell and Metabolic Biology Leibniz Institute of Plant Biochemistry06120 Halle(Saale)Germany

A switch off in jasmonate(JA)signaling by hydroxylation upon wounding was described in 2008(Miersch et al.,2008).This initiated the cloning of CYP450 enzymes involved in hydroxylation and carboxylation of JA and its amino acid conjugate JA-le,the most active form of JA compounds(reviewed by Wasternack and Feussner[2018]and Heitz et al.[2019]).Due to the central role of JA and JA-lle in plant stress responses and development(Wasternack and hause,2013),catabolism of JA and its derivatives is an essential component in the sustainment of homeostasis of active JA compounds(Howe et al.,2018;Heitz et al.,2019).Catabolism of JA and JAIle takes place by JA-induced oxygenases(JOXs),also named JA-oxidases(JAOs),and by hydroxylation(CYP94B3/B1)followed by carboxylation(CYP94C1),respectively(Heitz et al.,2019).Another reaction performed by IAR3/ILL6 results in the deconjugation of JA-lle and 12-OH-JA-le to JA and 12-OH-JA,respectively(Heitz et al.,2019;Wasternack and Feussner,2018).

关键词： conjugate initiated media

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

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Molecular Plant 2019年第10期12卷 1383-1394页

作者： Adina Schulze Marlene Zimmer Stefan Mielke Hagen Stellmach Charles WMelnyk bettina hause Debora Gasperini Department of Molecular Signal Processing Leibniz Institute of Plant BiochemistryWeinberg 306120 Halle(Saale)Germany Department of Cell and Metabolic Biology Leibniz Institute of Plant Biochemistry06120 Halle(Saale)Germany Department of Plant Biology.Swedish University of Agricultural Sciences 75651 UppsalaSweden

Multicellular organisms rely on the movement of signaling molecules across cells,tissues,and organs to communicate among distal *** plants,localized leaf damage activates jasmonic acid(JA)-dependent transcriptional reprogramming in both harmed and unharmed *** 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 ***,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 *** 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 *** root relocation,the mobile precursors cooperatively regulated JA responses through their conversion into JA-Ile and JA signaling ***,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

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The Isogene 1-Deoxy-D-Xylulose 5-Phosphate Synthase 2 Controls Isoprenoid Profiles, Precursor Pathway Allocation, and Density of Tomato Trichomes

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Molecular Plant 2010年第5期3卷 904-916页

作者： Heike Paetzold Stefan Garms Stefan Bartram Jenny Wieczorek Eva-Maria Uros-Gracia Manuel Rodriguez-Concepcion Wilhelm Boland Dieter Strack bettina hause Michael H. Walter Leibniz Institut for Pflanzenbiochemie Abteilung Sekundarstoffwechsel Weinberg 3 D-06120 Halle (Saale) Germany Max-Planck-Institut fur Chemische Okologie Abteilung Bioorganische Chemie Hans-Knoll-Straβe 8 D-07745 Jena Germany Center for Research in Agricultural Genomics (CRAG) CSlC-IRTA-UAB Jordi Girona 18 08034 Barcelona Spain

Plant isoprenoids are formed from precursors synthesized by the mevalonate （MVA） pathway in the cytosol or by the methyl-D-erythritol 4-phosphate （MEP） pathway in plastids. Although some exchange of precursors occurs, cytosolic sesquiterpenes are assumed to derive mainly from MVA, while plastidial monoterpenes are produced preferentially from MEP precursors. Additional complexity arises in the first step of the MEP pathway, which is typically catalyzed by two divergent 1-deoxy-D-xylulose 5-phosphate synthase isoforms （DXS1, DXS2）. In tomato （Solanum lycopersicum）, the SIDXS1 gene is ubiquitously expressed with highest levels during fruit ripening, whereas SIDXS2 transcripts are abundant in only few tissues, including young leaves, petals, and isolated trichomes. Specific down-regulation of SIDXS2 expression was performed by RNA interference in transgenic plants to investigate feedback mechanisms. SIDXS2 down-regulation led to a decrease in the monoterpene β-phellandrene and an increase in two sesquiterpenes in trichomes. Moreover, incorporation of MVA-derived precursors into residual monoterpenes and into sesquiterpenes was elevated as determined by comparison of ^13C to ^12C natural isotope ratios. A compensatory up-regulation of SIDXS1 was not observed. Down-regulated lines also exhibited increased trichome density and showed less damage by leaf-feeding Spodoptera littoralis caterpillars. The results reveal novel, non-redundant roles of DXS2 in modulating isoprenoid metabolism and a pronounced plasticity in isoprenoid precursor allocation.

关键词： Isoprenoid biosynthesis methyI-D-erythritol 4-phosphate (MEP) pathway 1-deoxy-D-xylulose 5-phosphate synthase 2 (DXS2) RNA interference (RNAi) trichomes cross-talk feedback regulation GC-C-IRMS.

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