title: Susceptibility to hydrogen peroxide and catalase activity of root nodule bacteria.
abstract: The root nodule bacteria (free-living cells) tested had higher susceptibility to hydrogen peroxide (H2O2) than the other genera of aerobic or facultative anaerobic bacteria tested. The catalase activities tended to have a positive correlation with H2O2 resistance among all bacteria tested. Addition of a catalase inhibitor such as 3-amino-1, 2, 4-triazole increased the susceptibility to H2O2. These results suggest that the lower catalase activity brings about the higher susceptibility of root nodule bacteria to H2O2. Root nodule bacteria seemed to have two or three catalase isozymes during growth and their catalase activities were higher in log phase than in stationary phase, contrary to other genera of bacteria tested.
authors.affiliation: Department of Bioresource Science, Obihiro University of Agriculture and Veterinary Medicine, Hokkaido, Japan. taku@obihiro.ac.jp
authors.forename: T
authors.initials: T
authors.lastname: Ohwada
authors.forename: Y
authors.initials: Y
authors.lastname: Shirakawa
authors.forename: M
authors.initials: M
authors.lastname: Kusumoto
authors.forename: H
authors.initials: H
authors.lastname: Masuda
authors.forename: T
authors.initials: T
authors.lastname: Sato
mesh_terms: D000640:Amitrole / Q000494:pharmacology; D001420:Bacteria, Aerobic / Q000187:drug effects / Q000201:enzymology / Q000254:growth & development; D001421:Bacteria, Anaerobic / Q000187:drug effects / Q000201:enzymology / Q000254:growth & development; D020369:Bradyrhizobium / Q000187:drug effects / Q000201:enzymology / Q000254:growth & development*; D002374:Catalase / Q000378:metabolism*; D004591:Electrophoresis, Polyacrylamide Gel; D006861:Hydrogen Peroxide / Q000378:metabolism* / Q000494:pharmacology; D016877:Oxidants / Q000378:metabolism* / Q000494:pharmacology; D010544:Peroxidases / Q000378:metabolism; D018517:Plant Roots / Q000382:microbiology*; D012230:Rhizobiaceae / Q000187:drug effects / Q000201:enzymology* / Q000254:growth & development*; D016961:Rhizobium leguminosarum / Q000187:drug effects / Q000201:enzymology / Q000254:growth & development; D016962:Sinorhizobium meliloti / Q000187:drug effects / Q000201:enzymology / Q000254:growth & development
chemical_list: D016877:Oxidants; D006861:Hydrogen Peroxide; D010544:Peroxidases; D002374:Catalase; D000640:Amitrole