title: Pythium sterilum sp. nov. isolated from Poland, Spain and France: its morphology and molecular phylogenetic position.
abstract: In a survey of Phytophthora species associated with forest decline in Spain, Poland and France, we found three Pythium isolates, which have been characterized with internal transcribed spacer rRNA gene sequences and with classical morphological descriptors for Pythium spp. These isolates showed unique internal transcribed spacer sequences, different enough from those of any described species to justify new species status. These three distinct isolates failed to produce any sex organs with an entirely asexual reproduction and were found to represent a new species for which the name Pythium sterilum is proposed. This paper describes and illustrates the morphology of P. sterilum and presents its taxonomic position and relationships with other, related Pythium species belonging to clade K.
authors.affiliation: Laboratory of Applied Genetics, School of Engineering of Lullier, University of Applied Sciences of Western Switzerland, Jussy, Switzerland. lassaad.belbahri@etat.ge.ch
authors.forename: Lassaad
authors.initials: L
authors.lastname: Belbahri
authors.forename: Gautier
authors.initials: G
authors.lastname: Calmin
authors.forename: Esperanza
authors.initials: E
authors.lastname: Sanchez-Hernandez
authors.forename: Tomasz
authors.initials: T
authors.lastname: Oszako
authors.forename: Francois
authors.initials: F
authors.lastname: Lefort
mesh_terms: D001483:Base Sequence; D004271:DNA, Fungal / Q000032:analysis / Q000302:isolation & purification; D021903:DNA, Ribosomal Spacer / Q000032:analysis* / Q000737:chemistry / Q000235:genetics; D005602:France; D020459:Genes, rRNA; D008969:Molecular Sequence Data; D016533:Mycological Typing Techniques; D010802:Phylogeny; D011044:Poland; D011775:Pythium / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification / Q000648:ultrastructure; D017422:Sequence Analysis, DNA; D012988:Soil Microbiology; D013030:Spain
chemical_list: D004271:DNA, Fungal; D021903:DNA, Ribosomal Spacer