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The Genetic Dissection of a Short-Term Response to Low CO_(2) Supports the Possibility for Peroxide-Mediated Decarboxylation of Photorespiratory Intermediates in the Peroxisome

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Molecular plant 2012年第6期5卷 1413-1416页

作者： Olivier Keech Wenxu Zhou Ricarda Fenske Catherine Colas-des-Francs-Small John D.Bussell Murray R.Badger Steven M.Smith centres of excellence for plant metabolomics and plant energy biology University of Western Australia35 Stirling HighwayCrawleyWestern Australia 6009Australia UPSC Department of Plant PhysiologyUmea University90187UmeaSweden metabolomics Australia University of Western Australia35 Stirling HighwayCrawleyWestern Australia 6009Australia Centre of excellence in plant energy biology Research School of BiologyAustralian National UniversitySullivans Creek RoadActon ACT 0200Australia

Dear Editor, Photorespiration reduces plant carbon assimilation by an estimated 25%-50% of net CO2 assimilation in typical C3 plants （Roussel and Igamberdiev, 2011）. It results from the oxygenase activity of Rubisco giving rise to phosphogly- colate. Subsequent photorespiratory metabolism involves decarboxylation of glycine in the mitochondrion and reduc- tion of hydroxypyruvate, usually assumed to occur in the peroxisome. Recent research in Arabidopsis has highlighted possible alternative sites of hydroxypyruvate reductase （HPR） activity （Figure 1A）. In addition to the accepted reduction by peroxisomal HPR1, Timm et al. （2008） identified cytosolic HPR2 and a putative chloroplast HPR3 （Timm et al., 2011）. For HPR2 or HPR3 to function in photorespiration, hydroxypyru- vate would first need to pass from the peroxisome into the cytosol. Another potential fate for hydroxypyruvate is its non-enzymic （NE） decarboxylation by reaction with hydrogen peroxide as previously suggested by experiments performed on isolated peroxisomes （Walton and Butt, 1981）.

关键词： HYDROXYPYRUVATE REDUCTASE OXIDATIVE STRESS IRON-DEFICIENCY ABSENCE CAUSES ARABIDOPSIS CATALASE plantS PHOTOSYNTHESIS STOICHIOMETRY METABOLISM

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Integrative Multi-omics Analyses of Barley Rootzones under Salinity Stress Reveal Two Distinctive Salt Tolerance Mechanisms

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plant Communications 2020年第3期1卷 107-123页

作者： William Wing Ho Ho Camilla B.Hill Monika S.Doblin Megan C.Shelden Allison van de Meene Thusitha Rupasinghe Antony Bacic Ute Roessner School of BioSciences The University of MelbourneParkvilleVIC 3010Australia School of Veterinary and Life Sciences Murdoch UniversityMurdochWA 6150Australia La Trobe Institute for Agriculture&Food Department of AnimalPlant and Soil ScienceLa Trobe UniversityBundooraVIC 3086Australia ARC Centre of excellence in plant energy biology School of AgricultureFood and WineUniversity of AdelaideGlen OsmondSA 5064Australia metabolomics Australia The University of MelbourneParkvilleVIC 3010Australia

The mechanisms underlying rootzone-localized responses to salinity during early stages of barley development remain *** this study,we performed the analyses of multi-root-omes(transcriptomes,metabolomes,and lipidomes)of a domesticated barley cultivar(Clipper)and a landrace(Sahara)that maintain and restrict seedling root growth under salt stress,*** generalized linear models were designed to determine differentially expressed genes(DEGs)and abundant metabolites(DAMs)specific to salt treatments,genotypes,or rootzones(meristematic Z1,elongation Z2,and maturation Z3).Based on pathway over-representation of the DEGs and DAMs,phenylpropanoid biosynthesis is the most statistically enriched biological pathway among all salinity responses *** with histological evidence,an intense salt-induced lignin impregnation was found only at stelic cell wall of Clipper Z2,compared with a unique elevation of suberin deposition across Sahara *** suggests two differential salt-induced modulations of apoplastic flow between the *** on the global correlation network of the DEGs and DAMs,callose deposition that potentially adjusted symplastic flow in roots was almost independent of salinity in rootzones of Clipper,and was markedly decreased in *** together,we propose two distinctive salt tolerance mechanisms in Clipper(growth-sustaining)and Sahara(salt-shielding),providing important clues for improving crop plasticity to cope with deteriorating global soil salinization.

关键词： barley root transcriptomics metabolomics lipidomics omics integration salinity stress

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