title: Salt stress causes peroxisome proliferation, but inducing peroxisome proliferation does not improve NaCl tolerance in Arabidopsis thaliana.
abstract: The PEX11 family of peroxisome membrane proteins have been shown to be involved in regulation of peroxisome size and number in plant, animals, and yeast cells. We and others have previously suggested that peroxisome proliferation as a result of abiotic stress may be important in plant stress responses, and recently it was reported that several rice PEX11 genes were up regulated in response to abiotic stress. We sought to test the hypothesis that promoting peroxisome proliferation in Arabidopsis thaliana by over expression of one PEX11 family member, PEX11e, would give increased resistance to salt stress. We could demonstrate up regulation of PEX11e by salt stress and increased peroxisome number by both PEX11e over expression and salt stress, however our experiments failed to find a correlation between PEX11e over expression and increased peroxisome metabolic activity or resistance to salt stress. This suggests that although peroxisome proliferation may be a consequence of salt stress, it does not affect the ability of Arabidopsis plants to tolerate saline conditions.
authors.affiliation: Centre for Plant Sciences, University of Leeds, Leeds, United Kingdom.
authors.forename: Shiro
authors.initials: S
authors.lastname: Mitsuya
authors.forename: Mahmoud
authors.initials: M
authors.lastname: El-Shami
authors.forename: Imogen A
authors.initials: IA
authors.lastname: Sparkes
authors.forename: Wayne L
authors.initials: WL
authors.lastname: Charlton
authors.forename: Carine De Marcos
authors.initials: Cde M
authors.lastname: Lousa
authors.forename: Barbara
authors.initials: B
authors.lastname: Johnson
authors.forename: Alison
authors.initials: A
authors.lastname: Baker
mesh_terms: D017360:Arabidopsis / Q000166:cytology / Q000235:genetics / Q000502:physiology*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism / Q000502:physiology; D002460:Cell Line; D002478:Cells, Cultured; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D015151:Immunoblotting; D008164:Luminescent Proteins / Q000235:genetics / Q000378:metabolism; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism / Q000502:physiology; D008856:Microscopy, Fluorescence; D000074401:Peroxins; D020675:Peroxisomes / Q000187:drug effects* / Q000378:metabolism / Q000502:physiology; D030821:Plants, Genetically Modified; D020033:Protein Isoforms / Q000235:genetics / Q000378:metabolism / Q000502:physiology; D055049:Salt Tolerance / Q000502:physiology*; D012965:Sodium Chloride / Q000494:pharmacology*; D014026:Nicotiana / Q000166:cytology; D015854:Up-Regulation / Q000187:drug effects
chemical_list: D029681:Arabidopsis Proteins; D008164:Luminescent Proteins; D008565:Membrane Proteins; D000074401:Peroxins; D020033:Protein Isoforms; C518023:peroxin 11 protein, Arabidopsis; D012965:Sodium Chloride