1. Pythium polare, a new heterothallic oomycete causing brown discolouration of Sanionia uncinata in the Arctic and Antarctic.
- Author
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Tojo M, van West P, Hoshino T, Kida K, Fujii H, Hakoda A, Kawaguchi Y, Mühlhauser HA, Van Den Berg AH, Küpper FC, Herrero ML, Klemsdal SS, Tronsmo AM, and Kanda H
- Subjects
- Antarctic Regions, Arctic Regions, Cluster Analysis, DNA, Fungal chemistry, DNA, Fungal genetics, DNA, Ribosomal Spacer chemistry, DNA, Ribosomal Spacer genetics, Molecular Sequence Data, Phylogeny, Pythium cytology, Pythium genetics, Sequence Analysis, DNA, Spores, Fungal cytology, Water Microbiology, Bryopsida microbiology, Plant Diseases microbiology, Pythium classification, Pythium isolation & purification
- Abstract
Pythium polare sp. nov. is a new heterothallic oomycete species isolated from fresh water and moss from various locations in both the Arctic and Antarctic. This water mould is able to infect stems and leaves of Sanionia moss (Sanionia uncinata). Pythium polare causes brown discolouration in in vitro inoculation tests at 5 °C after 5 weeks of inoculation. It is characterized by globose sporangia with various lengths of discharge tubes releasing zoospores and aplerotic oospores with usually one to five antheridia. The sexual structures are only produced in a dual culture of antheridial and oogonial isolates. Phylogenetic analysis, based on ITS sequencing, places all isolated strains of P. polare in a unique new clade, hence it is considered a novel species. Pythium canariense and Pythium violae are the most closely related species of P. polare based both on morphology and the phylogenetic analysis., (Copyright © 2012 The British Mycological Society. All rights reserved.)
- Published
- 2012
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