title: Pyrene fluorescence probing of unsaturated lipids in Phytophthora infestans zoospores.
abstract: Pyrene rapidly penetrates into isolated zoospores of phytopathogenic fungus Phytophthora infestans localizing predominantly in lipid bodies. An analysis of steady-state monomer and excimer fluorescence spectra, as well as of vibronic structure has suggested a considerable part of the fluorescent probe to be located in a lipid environment. Pyrene partition into hydrophilic phase was observed at its high concentrations. Catalytic hydrogenation of unsaturated lipids in zoospores in situ reduced excimer production. The kinetics of changes of pyrene excimerization suggest that hydrogenation affects both the surface and the intrinsic lipids of the zoospores. The usefulness of pyrene as a fluorescent probe for unsaturated lipids in membranes and lipid bodies of intact cells, and the possible role of eicosapolyunsaturated fatty acids in induction of immune response in potato plants are discussed.
authors.affiliation: Department of Cell Physiology and Immunology, Faculty of Biology, Moscow State University, USSR.
authors.forename: M N
authors.initials: MN
authors.lastname: Merzlyak
authors.forename: P A
authors.initials: PA
authors.lastname: Kashulin
mesh_terms: D001665:Binding Sites; D005456:Fluorescent Dyes; D006865:Hydrogenation; D050356:Lipid Metabolism; D008055:Lipids / Q000737:chemistry*; D010838:Phytophthora / Q000737:chemistry*; D011721:Pyrenes / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013172:Spores, Fungal / Q000737:chemistry
chemical_list: D005456:Fluorescent Dyes; D008055:Lipids; D011721:Pyrenes; C030984:pyrene