Phytophthora chilensis

Name and publication

Phytophthora chilensis T. Jung, M. Horta Jung, A. Durán & 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

MB 843146

Etymology

Name refers to the origin of all known isolates in Chile.

Typification

Type: Chile, Parque Oncol, isolated from a stream running through a Valdivian rainforest using a Rhododendron leaf as bait, Nov. 2014, T. Jung, A. Durán & E. Sanfuentes, holotype HNHM-MYC-009700, dried culture on V8A, Herbarium of the Hungarian Natural History Museum, Budapest

Ex-type: culture CBS 148797 = NRRL 64353 = CL165

Sequences for ex-type in original manuscript:  LSU ON000632, ITS ON000726, β-tubulin OM975905, hsp90 OM976422, tigA OM974600, rpl10 OM974459, tef-1a OM984886, enolase OM976518, cox1 ON013732, ypt1 ON024944, nadh1 OM976902, rps10 OM976660

Molecular identification

Position in ITS phylogenetic tree

Clade 10a

Morphological identification

Colonies and cardinal temperatures

Colony morphology appressed, radiate with limited aerial mycelium on V8A and CA, dense-felty with radiating raised lobes separated by irregular trenches on PDA. Optimum growth temperature 20°C and maximum 25°C.

Conditions for growth and sporulation

Sporangia produced in non-sterile soil extract after 1–2d. Oogonia produced readily in single culture on V8A after 2–3 weeks.

Asexual phase

Sporangia were papillate, caducous, and predominantly broad ovoid to elongated ovoid in shape. Sporangia averaged 43.3 x 29.5 µm (overall range 20.7–60.3 x 13.4–42.1 µm), external proliferation. Sporangiophores dense sympodia. Hyphal swellings rare. Chlamydospores absent.

Sexual phase

Homothallic. Oogonia smooth-walled, often with a tapering base, 15–35 µm. Oospores predominantly plerotic, size ranged 14–33 µm. Antheridia amphigynous.

Most typical characters

Resides in phylogenetic clade 10a and is closely related to P. pseudochilensis, P. kernoviae, and P. pseudokernoviae. These species have similar morphology and low temperature optima and maxima.

Additional specimen(s) evaluated

Chile, Parque Oncol, isolated from streams running through Valdivian rainforests using Rhododendron leaves as baits, Nov. 2014, T. Jung, A. Durán & E. Sanfuentes, CL166, CL169, CL170, CL171, CL172.

Hosts and distribution

Distribution: Chile
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