title: Magnaporthe grisea pathogenicity genes obtained through insertional mutagenesis.
abstract: We have initiated a mutational analysis of pathogenicity in the rice blast fungus, Magnaporthe grisea, in which hygromycin-resistant transformants, most generated by restriction enzyme-mediated integration (REMI), were screened for the ability to infect plants. A rapid primary infection assay facilitated screening of 5,538 transformants. Twenty-seven mutants were obtained that showed a reproducible pathogenicity defect, and 18 of these contained mutations that cosegregated with the hygromycin resistance marker. Analysis of eight mutants has resulted in the cloning of seven PTH genes that play a role in pathogenicity on barley, weeping lovegrass, and rice. Two independent mutants identified the same gene, PTH2, suggesting nonrandom insertion of the transforming DNA. These first 7 cloned PTH genes are described.
authors.affiliation: Central Research and Development Department, E. I. du Pont de Nemours and Co., Inc., Wilmington, DE 19880-0402, USA. Jim.Sweigard@usa.dupont.com
authors.forename: J A
authors.initials: JA
authors.lastname: Sweigard
authors.forename: A M
authors.initials: AM
authors.lastname: Carroll
authors.forename: L
authors.initials: L
authors.lastname: Farrall
authors.forename: F G
authors.initials: FG
authors.lastname: Chumley
authors.forename: B
authors.initials: B
authors.lastname: Valent
mesh_terms: D000595:Amino Acid Sequence; D001203:Ascomycota / Q000235:genetics* / Q000472:pathogenicity*; D002874:Chromosome Mapping; D003001:Cloning, Molecular; D004271:DNA, Fungal / Q000235:genetics; D005656:Fungal Proteins / Q000235:genetics; D005800:Genes, Fungal; D005819:Genetic Markers; D001467:Hordeum / Q000382:microbiology; D008969:Molecular Sequence Data; D016254:Mutagenesis, Insertional; D012275:Oryza / Q000382:microbiology; D006109:Poaceae / Q000382:microbiology; D017386:Sequence Homology, Amino Acid; D014170:Transformation, Genetic; D014774:Virulence / Q000235:genetics
chemical_list: D004271:DNA, Fungal; D005656:Fungal Proteins; D005819:Genetic Markers