title: Phytophthora x pelgrandis, a new natural hybrid pathogenic to Pelargonium grandiflorum hort.
abstract: A new Phytophthora hybrid of Ph. cactorum (Leb. & Cohn) Schroet. and Ph. nicotianaevan Breda de Haan pathogenic to cultivars of Pelargonium grandiflorum hort. is described as Phytophthora X pelgrandis and its morphological features are documented. Morphological, physiological (e.g., temperature requirements) and molecular data (DNA sequencing, random amplified polymorphic DNA-PCR) are presented for isolates of the Phytophthora hybrid. Pathogenicity was tested on cultivars of P. grandiflorum and Nicotiana tabacum. For comparison cultures of the parental species and additional Phytophthora taxa also were examined.
authors.affiliation: Julius Kühn Institute-Federal Research Center for Cultivated Plants, Institute for Epidemiology and Pathogen Diagnostics, Berlin-Dahlem, Germany. Helgard.Nirenberg@jki.bund.de
authors.forename: Helgard I
authors.initials: HI
authors.lastname: Nirenberg
authors.forename: Wolfram F
authors.initials: WF
authors.lastname: Gerlach
authors.forename: Tom
authors.initials: T
authors.lastname: Gräfenhan
mesh_terms: D021903:DNA, Ribosomal Spacer / Q000235:genetics; D003576:Electron Transport Complex IV / Q000235:genetics; D008969:Molecular Sequence Data; D031316:Pelargonium / Q000382:microbiology*; D010802:Phylogeny; D010838:Phytophthora / Q000235:genetics / Q000302:isolation & purification / Q000472:pathogenicity / Q000502:physiology*; D019105:Random Amplified Polymorphic DNA Technique; D013045:Species Specificity; D013172:Spores, Fungal / Q000166:cytology; D013696:Temperature
chemical_list: D021903:DNA, Ribosomal Spacer; D003576:Electron Transport Complex IV