title: Morphological and molecular taxonomy of Pythium longisporangium sp. nov. isolated from the Burgundian region of France.
abstract: During the course of an investigation on the Pythiaceous oomycetes occurring in the Burgundian vineyards, some species of Pythium possessing mainly hypogynous antheridia were found. These had been classified as oomycetes belonging to the "Pythium rostratum" group for a long time. Three of these isolates, having similar structures and growth, are very closely related to a recently described species, Pythium bifurcatum Paul. A close look at these, however, underlines some fundamental differences with the latter. Not all of them produce zoospores but have very large sporangia. The type specimen is F-1200 (B 76a) which is a medium-slow growing saprophyte. The sequence of the ITS region of the rDNA also shows a very close relationship with P. bifurcatum. On the basis of morphological and molecular analysis, we now describe this species as Pythium longisporangium sp. nov. Morphological features of this new species, the sequences of the ITS region of its nuclear ribosomal DNA, and its comparison with related species are discussed.
authors.affiliation: Laboratoire des Sciences de la Vigne, Institut Jules Guyot, Université de Bourgogne, B.P. 27877, 21078 Dijon, France. bernard.paul@u-bourgogne.fr
authors.forename: Bernard
authors.initials: B
authors.lastname: Paul
authors.forename: Kanak
authors.initials: K
authors.lastname: Bala
authors.forename: Sabine
authors.initials: S
authors.lastname: Gognies
authors.forename: Abdel
authors.initials: A
authors.lastname: Belarbi
mesh_terms: D001483:Base Sequence; D021903:DNA, Ribosomal Spacer / Q000032:analysis / Q000737:chemistry; D005602:France; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction; D011775:Pythium / Q000145:classification* / Q000235:genetics / Q000254:growth & development / Q000648:ultrastructure*; D012335:RNA, Ribosomal / Q000235:genetics; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D012988:Soil Microbiology; D014920:Wine
chemical_list: D021903:DNA, Ribosomal Spacer; D012335:RNA, Ribosomal