Phytophthora pseudogallica

Name and publication

Phytophthora pseudogallica T. Jung, N.M. Chi, Brasier & 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

MB842950

Etymology

Name refers to the morphological similarity to P. gallica.

Typification

Type: Sapa, isolated from a fallen leaf in a stream running through an evergreen cloud forest, 2017, T. Jung & N.M. Chi, holotype HNHM-MYC-009706, dried culture on V8A, Herbarium of the Hungarian Natural History Museum, Budapest, Hungary

Ex-type: culture CBS 149206 = NRRL 64136 = VN861

Sequences for ex-type in original manuscript:  LSU ON000680, ITS ON000774, β-tubulin OM975953, hsp90 OM976470, tigA OM974647, rpl10 OM97507, tef-1a OM984933, enolase OM976564, cox1 ON013840, ypt1 ON024990, nadh1 OM976949, rps10 OM976708

Molecular identification

Position in ITS phylogenetic tree

Clade 10b

Morphological identification

Colonies and cardinal temperatures

Colony morphology striate on V8A with white aerial mycelium in the center and appressed to submerged margins, uniform and dense-felty on CA, and stoloniferous dense-felty on PDA. Optimum growth temperature 20°C and maximum 25°C.

Conditions for growth and sporulation

Sporangia produced in non-sterile soil extract after 2–3d. Oogonia were not produced in paired cultures using several known tester strains.

Asexual phase

Sporangia were nonpapillate, persistent, and predominantly ovoid to broad ovoid in shape. Sporangia averaged 25.2 x 21.3 µm (overall range 19.4–33.7 x 13.0–29.5 µm), proliferation internal, nested, and extended. Sporangiophores unbranched. Hyphal swellings absent. Chlamydospores present, golden brown.

Sexual phase

Sterile in culture.

Most typical characters

Resides in phylogenetic clade 10b, and is most closely related to P. tonkinensis, but differs by not producing oospores in culture. Morphologically it resembles P. gallica, another species from clade 10b.

Additional specimen(s) evaluated

Vietnam, Sapa, isolated from fallen leaves in a stream running through an evergreen cloud forest, 2017, T. Jung & N.M. Chi, VN910, VN920, VN922.

Hosts and distribution

Distribution: Vietnam
Substrate: fallen leaf in 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