title: An important role for secreted esterase in disease establishment of the wheat powdery mildew fungus Blumeria graminis f. sp. tritici.
abstract: The activity of esterase secreted by conidia of wheat powdery mildew fungus, Blumeria graminis f. sp. tritici, was assayed using indoxyl acetate hydrolysis, which generates indigo blue crystals. Mature, ungerminated, and germinating conidia secrete esterase(s) on artificial media and on plant leaf surfaces. The activity of these esterases was inhibited by diisopropyl fluorophosphate, which is selective for serine esterases. When conidia were inoculated on wheat leaves pretreated with diisopropyl fluorophosphate, both appressorial germ tube differentiation and symptom development were significantly impaired, indicating an important role of secreted serine esterases in wheat powdery mildew disease establishment.
authors.affiliation: Department of Biology, University of Saskatchewan, Saskatoon, Canada.
authors.forename: Jie
authors.initials: J
authors.lastname: Feng
authors.forename: Feng
authors.initials: F
authors.lastname: Wang
authors.forename: Geoff R
authors.initials: GR
authors.lastname: Hughes
authors.forename: Susan
authors.initials: S
authors.lastname: Kaminskyj
authors.forename: Yangdou
authors.initials: Y
authors.lastname: Wei
mesh_terms: D001203:Ascomycota / Q000187:drug effects / Q000201:enzymology* / Q000254:growth & development; D004950:Esterases / Q000378:metabolism*; D005656:Fungal Proteins / Q000378:metabolism*; D007531:Isoflurophate / Q000494:pharmacology; D010935:Plant Diseases / Q000382:microbiology; D018515:Plant Leaves / Q000382:microbiology; D013172:Spores, Fungal / Q000187:drug effects / Q000201:enzymology / Q000254:growth & development; D014908:Triticum / Q000382:microbiology*
chemical_list: D005656:Fungal Proteins; D007531:Isoflurophate; D004950:Esterases; C022635:serine esterase