Phytophthora castaneae

Name and publication

Phytophthora castaneae Katsura & Uchida (1976)

Katsura K. 1976. Two new species of Phytophthora causing damping-off of cucumber and trunk rot of chestnut. Trans. Mycol. Soc. Japan 17: 238–242.

Nomenclature

Mycobank

MB283626

Synonymy

Phytophthora katsurae W.H. Ko & H.S. Chang, Mycologia 71: 841. 1979, nom. nov., nom. illegit. [superfluous]

NOTE: Phytophthora castaneae Katsura & K. Uchida (1976) is the correct legitimate name for the taxon causing trunk rot of Castanea crenata, and Phytophthora katsurae is an illegitimate superfluous name (Pennycook S.R. 2013).

Typification

from Katsura (1976)

Type: JAPAN, Ibaraki from chesnut (Castanea crenata Sieb. Et Zucc.) trunk rot, 1971, K. Uchida No 1971-031 (deposited to the Plant Pathology Herbarium, Kyoto Prefectural University, Japan)

Ex-type: Culture P8 = NBRC 9753 = ICMP 19434 = WPC P10187 (Weir et al., 2015, taxonomic revision of species in Clade 5).

NOTES:

Deposit of culture into culture collection not indicated in original manuscript of Katsura 1976 [Weir et al (2015) published the taxonomic revision of species in Clade 5].

Sequences published by Weir et al (2015). ICMP 19434 = ITS KP295319, COX1 KP295234, YPT1 KP295426, HSP90 KP295288, L10 KP295375, ENL KP295265, NADH1 KP295346, TIGA KP295404

Ex-type in other collections

P8 = NBRC 9753 = ICMP 19434 = P10187 (WPC) = ATCC MYA-4060; K. Katsura, 1971-031 = Kuri 4, K. Uchida, P8, Gallegly p45, GAZ P990, 22H6, PD.00074 (as P. katsurae), CPHST BL 47G (Abad), 22H6 (Yang)

Molecular identification

Voucher sequences for barcoding genes (ITS rDNA and COI) of the ex-type (see Molecular protocols page)

Phytophthora castaneae isolate CPHST BL 47G (=P10187 WPC) = ITS rDNA MG865470, COI MH136866

Sequences for ex-type in other sources
Position in ITS phylogenetic tree

Clade 5

Morphological identification

Colonies and cardinal temperatures

Colony morphology on V8-agar and MEA with slow growth and on PDA with non-distinct pattern. Minimum growth temperature 6°C; maximum 30°C, and optimum 22.3°C.

Conditions for growth and sporulation

Oogonia produced on V8A.

Asexual phase

Sporangia papillate ocassionally bipapillate; persistent; limoniform, ovoid, obpyriform to obturbinate, some asymmetric (10–43 µm long x 10–38 µm wide); originated mostly terminal but occasionally laterally attached and sometimes formed intercalarily in the sporangiophores. Hyphal swellings sometimes produced in the sporangiphore and close to sporangium. Chlamydospores spherical (12–19 µm in diam.).

Sexual phase

Homothallic. Oogonia have warty protuberances on the surface and a distinct funnel-shaped base (19–31 µm diam.); antheridia amphigynous and spherical to ovoid; oospores globose (15–27 µm diam.).

Most typical characters

Phytophthora castaneae is characterized by the presence of oogonia with warty protuberances on the surface and a distinct funnel-shaped base.

Specimen(s) evaluated:

Phytophthora castaneae ex-type CPHST BL 47G duplicate of P10187, World Phytophthora Collection

Hosts and distribution

Distribution: Africa (Cote d'Ivoire), Asia (Japan, Taiwan), Caribbean (Jamaica), Pacific Islands (USA: HI), Papua New Guinea
Substrate: tree trunks, pods, fruit
Disease note: trunk rot of chestnut, fruit and heart rot of coconut
Hosts: Cocos nucifera (coconut, Arecaceae); Castanea crenata (chestnut, Fagaceae); also reported from Theobroma cacao (cacao, Malvaceae) (Erwin & Ribeiro 1996)

Retrieved January 29, 2018 from U.S. National Fungus Collections Nomenclature Database.

Quarantine status

USA: This species was listed as a species of concern during the 2009 Phytophthora prioritization project conducted by USDA APHIS PPQ CPHST PERAL (Schwartzburg et al.).

Additional references and links

Pennycook SR. 2013. Phytophthora castaneae, the correct name for P. katsurae nom. nov. superfl. Mycotaxon 121: 327-331.

Weir BS, Paredes EP, Anand N, Uchida JY, Shaun R, Pennycook SEB, and Beever RE. 2015. A taxonomic revision of Phytophthora Clade 5 including two new species, Phytophthora agathidicida and Phytophthora cocois. Phytotaxa 205: 021-038.

Fact sheet author

Z. Gloria Abad, Ph.D., USDA-APHIS-PPQ-S&T Beltsville Laboratory, United States of America