Name and publication
Phytophthora tonkinensis T. Jung, N.M. Chi, Scanu & 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.
Name refers to the origin of all known isolates in northern Vietnam (Tonkin is a previous name for the three northernmost regions of Vietnam).
Type: Vietnam, Sapa, isolated from a fallen leaf in a stream running through an evergreen cloud forest, 2017, T. Jung & N.M. Chi, holotype HNHM-MYC-009701, dried culture on V8A, Herbarium of the Hungarian Natural History Museum, Budapest, Hungary
Ex-type: CBS 148852 = NRRL 64356 = VN859
Sequences for ex-type in original manuscript: LSU ON000705, ITS ON000799, β-tubulin OM975978, hsp90 OM976495, tigA OM974672, rpl10 OM97532, tef-1a OM984958, enolase OM976589, cox1 ON013865, ypt1 ON025015, nadh1 OM976974, rps10 OM976733
Position in ITS phylogenetic tree
Colonies and cardinal temperatures
Colony morphology uniform on V8A and with faintly striate and dendroid sectors on CA; minimal growth on PDA. Optimum growth temperature 20°C and maximum 22.5°C.
Conditions for growth and sporulation
Sporangia were nonpapillate, persistent, and predominantly ovoid to broad ovoid and subglobose in shape. Sporangia averaged 59.2 x 37.1 µm (overall range 35.5–72.4 x 28.3–50.8 µm), proliferation internal, nested, and extended. Sporangiophores unbranched. Hyphae irregular and coralloid with dense aggregations; hyphal swellings absent. Chlamydospores absent.
Most typical characters
Additional specimen(s) evaluated
Vietnam, Sapa, isolated from a fallen leaf in a stream running through an evergreen cloud forest, 2017, T. Jung & N.M. Chi, VN1106, VN1107, VN1108, VN1109
Hosts and distribution
Substrate: fallen leaf in stream
Disease note: no known disease
Host: no known host
Additional references and links
Fact sheet author
Treena Burgess, Ph.D., Phytophthora Science and Management, Harry Butler Institute, Murdoch University