Pythium polare, a new heterothallic Oomycete causing brown discoloration of Sanionia uncinata in the Arctic and Antarctic

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...

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Bibliographic Details
Published in:Fungal Biology
Main Authors: Tojo, M, van West, P, Hoshino, T, Kida, K, Fujii, H, Hakoda, A, Kawaguchi, Y, Muellhauser, H, van den Berg, A, Küpper, Frithjof, Herrero, M, Klemsdal, S, Tronsmo, A, Kanda, H
Format: Article in Journal/Newspaper
Language:English
Published: 2012
Subjects:
Antarc*
Antarctic
Arctic
Online Access:https://pure.uhi.ac.uk/en/publications/69918a48-68f3-4671-a3d5-c3b01e377b9e
https://doi.org/10.1016/j.funbio.2012.04.005
Description
Summary: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.

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