Name and publication
Phytophthora docyniae Q.N. Dang, T.H. Nguyen & T.I. Burgess (2021)
Quynh. N. Dang, Thu. H. Nguyen, Hung. X. Tran & Thu. Q. Pham, Burgess TI. 2021. Phytophthora docyniae. Fungal Planet 1374. in Crous et al. Fungal Planet Description Sheets 1284–1382. Persoonia 47: 1–150.
refers to the genus name of the only known host, Docynia indica
Type: Vietnam, Yen Bai province, Mu Cang Chai, isolated from the soil and root of Docynia indica, collected by VL Binh & XT Hung, Oct. 2019, holotype CBS H-24780
Ex-type: culture CBS 148031
Sequences for ex-type in original manuscript: ITS MZ420209, β-tubulin MZ435255, cox1 MZ435257, LSU MZ435254
Position in ITS phylogenetic tree
Colony and cardinal temperatures
Colony have a chrysanthemum pattern on PDA and V8A and are uniform on CA. Minimum growth temperature 15°C, optimum 27.5°C, and maximum 35°C.
Conditions for growth and sporulation
Sporangia were non-papillate, persistent, and predominantly ellipsoid to ovoid in shape with internal proliferation, both nested and extended. Sporangia averaged 34.5 x 23.8 µm (overall range 30–39.5 x 19.8–27.9 µm), direct germination of sporangia with unusual shapes was observed. Sporangiophores simple. Hyphal swellings present. Chlamydospores present.
Sterile in culture
Most typical characters
Phytophthora docyniae resides in clade 9c most closely related to P. macrochlamydospora and P. quininea. Compared to the other species it has very small sporangia which often directly germinate before releasing zoospores.
Additional specimen(s) evaluated
Vietnam, Yen Bai province, Mu Cang Chai, isolated from the soil and root of Docynia indica, VL Binh & XT Hung, 2019, CBS 148031; FP78
Hosts and distribution
Disease note: root rot of Docynia indica
Host: Docynia indica
Additional references and links
Fact sheet author
Treena Burgess, Ph.D., Phytophthora Science and Management, Harry Butler Institute, Murdoch University