Phytophthora subarctica

Name and publication

Phytophthora subarctica T. Jung, T. Corcobado, J. Oliva & I. Milenković (2022)

Jung T, Milenković I, Corcobado T. et al. 2022. Extensive morphological and behavioural diversity among fourteen new and seven described species in Phytophthora Clade 10 and its evolutionary implications. Persoonia-Molecular Phylogeny and Evolution of Fungi 49: 1–57.

Nomenclature

Mycobank

MB843134

Etymology

Name refers to the origin of all known isolates from the subarctic zone in northern Sweden.

Typification

Type: Sweden, Kiruna area, isolated from riverbank soil, Sept. 2017, I. Milenković & T. Corcobado, holotype HNHM-MYC- 020632, dried culture on V8A, Herbarium of the Hungarian Natural History Museum, Budapest, Hungary

Ex-type: CBS 148850 = NRRL 64339 = SW176

Sequences for ex-type in original manuscript:  LSU ON000696, ITS ON000790, β-tubulin OM975969, hsp90 OM976486, tigA OM974663, rpl10 OM97523, tef-1a OM984949, enolase OM976580, cox1 ON013856, ypt1 ON025006, nadh1 OM976965, rps10 OM976724

Molecular identification

Position in ITS phylogenetic tree

Clade 10c

Morphological identification

Colonies and cardinal temperatures

Colony morphology submerged and radiate on V8A and CA, and stoloniferous and dense felty with very slow growth on PDA. Optimum growth temperature 20°C and maximum 30°C.

Conditions for growth and sporulation

Sporangia produced in non-sterile soil extract after 1–2d. Oogonia were not produced in paired cultures using several known tester strains.

Asexual phase

Sporangia were nonpapillate, persistent, and predominantly ovoid to elongated ovoid in shape. Sporangia averaged 53.8 x 31.6 µm (overall range 32.7–127.6 x 16.3–39.5 µm), proliferation internal, nested, and extended; Sporangiophores unbranched or rarely on lax sympodia. Hyphal swellings rare. Chlamydospores absent.

Sexual phase

Sterile in culture.

Most typical characters

Resides in phylogenetic clade 10b and is closely related to P. gallica. While both sterile in culture, chlamydospores are formed in P. gallica.

Additional specimen(s) evaluated

Sweden, Kiruna area, isolated from forest stream, Sept. 2017, I. Milenković & T. Corcobado, SW639, SW640, SW641

Hosts and distribution

Distribution: Sweden
Substrate: forest stream
Disease note: no known disease
Host: no known host

Additional references and links

none available

Fact sheet author

Treena Burgess, Ph.D., Phytophthora Science and Management, Harry Butler Institute, Murdoch University