Name and publication
Phytophthora urerae GA Forbes & NJ Grünwald (2019)
Grünwald NJ, Forbes GA, Perez‐Barrera W, Stewart JE, Fieland VJ, Larsen MM. 2019. Phytophthora urerae sp. nov., a new clade 1c relative of the Irish famine pathogen Phytophthora infestans from South America. Plant Pathology 68 (3): 557–65.
Nomenclature
Mycobank
MB828472
Etymology
referring to the host plant Urera laciniata from which it was first isolated and which was validated as a host plant following Koch’s postulates
Typification
Type: Peru, San Ramon, Junin, isolated from plant host Urera laciniata in Peru, Collected by W. Perez-Barrera, holotype BPI893220
Ex-type: culture PSR27
Sequences for ex-type in original manuscript: PSR27; ITS KR632862, cox1 KR632858, PITG11126 KR632939, ypt1 KR632913, β-tubulin KR632888
Molecular identification
Position in ITS phylogenetic tree
Clade 1c
Morphological identification
Colonies and cardinal temperatures
Colonies smooth to slightly stellate on rye B and V8A, and appeared cottony and petallate to stellate on PDA. Minimum growth temperature 6°C, optimum 20–25°C, and maximum 28°C.
Conditions for growth and sporulation
Sporangia produced on solid V8A. Oogonia are formed readily on agar within 7 days when paired with opposite mating type.
Asexual phase
Sporangia were semi-papillate to papillate, caducous, and predominantly ellipsoid in shape. Sporangia averaged 30 x 18 µm (overall range 20–36 x 14–22 µm). Hyphal swellings absent. Chlamydospores absent.
Sexual phase
Heterothallic. Oogonia smooth-walled, size ranged from 22–40 µm. Oospores plerotic, size ranged 18–35 µm. Antheridia amphigynous.
Most typical characters
Morphologically similar to other species in Clade 1c. Can be distinguished as it can only cause symptoms on a single host Urera laciniata.
Additional specimen(s) evaluated
Peru, San Ramon, Junin, foliage of Urera laciniata, collected by W. Perez-Barrera, PSR26; PSR28; PSR29; PSR30; PSR31
Hosts and distribution
Distribution: Peru
Substrate: leaf
Disease note: foliar blight on leaves of native plant Urera laciniata in Peru
Host: Urera laciniata
Additional references and links
none available
Fact sheet author
Treena Burgess, Ph.D., Phytophthora Science and Management, Harry Butler Institute, Murdoch University