Open AccessPythium terrestris , a new species isolated from France, its ITS region, taxonomy and its comparison with related species
Author(s) -
Paul Bernard
Publication year - 2002
Publication title -
fems microbiology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.899
H-Index - 151
eISSN - 1574-6968
pISSN - 0378-1097
DOI - 10.1111/j.1574-6968.2002.tb11275.x
Subject(s) - pythium , sporangium , antheridium , biology , botany , taxonomy (biology) , ribosomal dna , mycelium , internal transcribed spacer , sensu , ribosomal rna , phylogenetics , genus , spore , genetics , gene
Pythium terrestris (F‐78) was isolated from soil samples taken in Lille in northern France. Its morphology resembles that of Pythium rostratum , and Pythium longandrum , a recently described species. However the antheridial and sporangial characteristics of this new species are unique. The fungus does not sporulate, the sporangium germinates directly into mycelium through germ tubes. The oogonia of P. terrestris are normally provided with hypogynous and monoclinous antheridia, at times the monoclinous antheridial branches wrap around the oogonia forming a complicated knot. Morphological features of this new species, together with the sequences of the internal transcribed spacer (ITS) region of its nuclear ribosomal DNA and its comparison with related species are discussed here.