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Spatial H202 Signaling Specificity： H202 from Chloroplasts and Peroxisomes Modulates the Plant Transcriptome Differentially

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Molecular Plant 2014年第7期7卷 1191-1210页

作者： Nasser Sewelam Nils Jaspert Katrien Van Der Kelen vanesa b. tognetti Jessica Schmitz Henning Frerigmann Elia Stahl Frank Van b.eusegem Veronica G. Maurino Institut of Developmental and Molecular b.ology of Plants Plant Molecular Physiology and Biotechnology Group Heinrich-Heine-Universit~t Universit~tsstraBe 1 40225 D~sseldorf Germany b.tany Department Faculty of Science Tanta University 31527 Tanta Egypt Department of Plant Systems b.ology VIB and Department of Plant Biotechnology and Bioinformatics Ghent UniversityTechnologiepark 927 B-9052 Gent Belgium Present address: Mendel Centre for Plant Genomics and Proteomics CEITEC--Central European Institute of Technology MasarykUniversity Kamenice 5 CZ-62500 Brno Czech Republic b.tanical Institute Cologne Biocenter University of Cologne 50674 Cologne Germany Cluster of Excellence on Plant Sciences (CEPLAS) 40225 Dusseldorf and 50674 Cologne Germany Molecular Ecophysiology of Plants Heinrich-Heine-Universitat Universitatsstraf3e 1 40225 D~sseldorf Germany

Hydrogen peroxide （H2O2） operates as a signaling molecule in eukaryotes, b.t the specificity of its signal- ing capacities remains largely unrevealed. Here, we analyzed whether a moderate production of H2O2 from two different plant cellular compartments has divergent effects on the plant transcriptome. Arab.dopsis thaliana overexpressing glycolate oxidase in the chloroplast （Fahnenstich et al., 2008; b.lazadeh et al., 2012） and plants deficient in peroxisomal catalase （Queval et al., 2007; Inze et al., 2012） were grown under non-photorespiratory conditions and then transferred to photorespiratory conditions to foster the production of H202 in b.th organelles. We show that H202 originating in a specific organelle induces two types of responses： one that integrates signals independently from the sub.ellular site of H202 production and another that is dependent on the H2O2 production site. H2O2 produced in peroxisomes induces transcripts involved in protein repair responses, while H2O2 produced in chloroplasts induces early signaling responses, including transcription factors and b.osynthetic genes involved in production of secondary signaling messengers. There is a significant b.as towards the induction of genes involved in responses to wounding and pathogen attack b. chloroplas- tic-produced H202, including indolic glucosinolates-, camalexin-, and stigmasterol-b.osynthetic genes. These transcriptional responses were accompanied b. the accumulation of 4-methoxy-indol-3-ylmethyl glucosinolate and stigmasterol.

关键词： hydrogen peroxide reactive oxygen species glycolate oxidase catalase photorespiration oxidative signaling.

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