title: Establishment of a gene transfer system for Pseudozyma flocculosa, an antagonistic fungus of powdery mildew fungi.
abstract: A reliable DNA-mediated transformation system has been developed for Pseudozyma flocculosa, a fungus that is antagonistic to powdery-mildew fungi. Plasmids harboring various selectable markers under the control of different promoters were tested. Molecular analyses demonstrated that successful transformation could be achieved using a plasmid that confers resistance to hygromycin B under the control of the Ustilago maydis hsp70 promoter and terminator sequences. On average, 1-40 (mean = 20) transformants were obtained per 10 microg of linearized DNA per 10(8) protoplasts. Southern analysis of the transformants revealed that, in each case, the vector had integrated in multiple tandem copies into the genome of P. flocculosa, and that integration events were random. Pulsed-field gel electrophoresis was employed to separate the genome of P. flocculosa into at least 11 chromosomes with sizes ranging from 0.55 Mb to 2.9 Mb. Hybridization with the plasmid indicated that integration of vector DNA had occurred in one to several chromosomes depending on the transformant examined.
authors.affiliation: Centre de recherche en horticulture, Département de Phytologie, Université Laval, Québec, Canada.
authors.forename: Y L
authors.initials: YL
authors.lastname: Cheng
authors.forename: F
authors.initials: F
authors.lastname: Belzile
authors.forename: P
authors.initials: P
authors.lastname: Tanguay
authors.forename: L
authors.initials: L
authors.lastname: Bernier
authors.forename: R R
authors.initials: RR
authors.lastname: Bélanger
mesh_terms: D001483:Base Sequence; D001487:Basidiomycota / Q000235:genetics*; D015139:Blotting, Southern; D017931:DNA Primers; D004271:DNA, Fungal; D004591:Electrophoresis, Polyacrylamide Gel; D018014:Gene Transfer Techniques; D010957:Plasmids; D016133:Polymerase Chain Reaction; D011401:Promoter Regions, Genetic; D014170:Transformation, Genetic
chemical_list: D017931:DNA Primers; D004271:DNA, Fungal