Phytophthora javanensis

Name and publication

Phytophthora javanensis T. Jung, M. Junaid, N. Nasri & M. Horta Jung (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

MB842954

Etymology

Name refers to the origin of the first isolates in Java.

Typification

Type: Indonesia, Java, Gunung Puntang, Bandung area, isolated from a naturally fallen leaf floating in a stream running through a submontane tropical rainforest, Feb. 2019, T. Jung, M. Junaid & N. Nasri, holotype HNHM-MYC-009702, dried culture on V8A, Herbarium of the Hungarian Natural History Museum, Budapest

Ex-type: culture CBS 149203 = NRRL 64129 = JV025a

Sequences for ex-type in original manuscript:  LSU ON000646, ITS ON000740, β-tubulin OM975919, hsp90 OM976436, tigA OM974613, rpl10 OM974473, tef-1a OM984899, enolase OM976531, cox1 ON013806, ypt1 ON024956, nadh1 OM976916, rps10 OM976674

Molecular identification

Position in ITS phylogenetic tree

Clade 10a

Morphological identification

Colonies and cardinal temperatures

Colony morphology dendroid to stoloniferous colonies with limited aerial mycelium on V8A and CA, and dense-woolly and uniform on PDA. Optimum growth temperature 20°C and maximum 27.5°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 ovoid and limoniform in shape. Sporangia averaged 38.3 x 23.2 µm (overall range 19.3–62.6 x 9.2–36.7 µm), external proliferation. Sporangiophores dense sympodia. Hyphal swellings absent. Chlamydospores absent.

Sexual phase

Homothallic. Oogonia smooth-walled, 16–43 µm. Oospores predominantly plerotic, size ranged 14–39 µm. Antheridia amphigynous.

Most typical characters

Resides in phylogenetic clade 10a and is closely related to P. multiglobulosa and P. javanensis. These species have similar morphology and have to date been recovered only from Indonesia.

Additional specimen(s) evaluated

Indonesia, Java, Gunung Puntang, Bandung area, isolated from naturally fallen leaves floating in a stream running through a submontane tropical rainforest, Feb. 2019, T. Jung, M. Junaid & N. Nasri, JV025b, JV191, JV192, JV193; South Sulawesi Province, District of Tana Toraja, May 2019, SL081, SL084, SL537, SL538, SL539.

Hosts and distribution

Distribution: Indonesia
Substrate: fallen leaves in 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