Name and publication
Phytophthora agathidicida Weir, Beever, Pennycook & Bellgard (2015)
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 P. cocois. Phytotaxa 205: 21–38 (pg. 29).
Corresponding author: WeirB@LandcareResearch.co.nz
Nomenclature
from Weir et al. (2015)
Mycobank
Index Fungorum
Etymology
Latin noun: agathid- (linguistic stem of Agathis) and -cida (suffix: one who kills)—the Agathis killer
Typification
Type: NEW ZEALAND. Coromandel: Great Barrier Island, from bleeding lesion on trunk of Agathis australis (D. Don) Lindl. ex Loudon, 23 Mar. 2006, R.E. Beever REB316-14, dried culture specimen PDD 91595. [PDD = New Zealand Fungal and Plant Disease Fungarium (New Zealand)].
Ex-type: living culture preserved in a metabolically inactive state as ICMP 17027 International Collection of Micro-organisms from Plants and P15175 (WPC - World Phytophthora Collection)
Sequences for ex-type in original manuscript: ICMP 17027 = ITS KP295308, COX1 KP295222, YPT1 KP295429, HSP90 KP295276, L10 KP295363, ENL KP295255, ND1 KP295334, TIGA KP295392
Ex-type in other collections
ICMP 17027 = NZFS 3770, P15175 (WPC), CPHST BL 154 (Abad), 67D5 (Yang)
Molecular identification
Voucher sequences for barcoding genes (ITS rDNA and COI) of the ex-type (see Molecular protocols page)
Phytophthora agathicida isolate CPHST BL 154 (= P15175 WPC) = ITS rDNA MG602692, COI MK493471
Sequences for ex-type with other genes and in other sources
- NCBI: Phytophthora agathidicida CPHST BL 154
- NCBI: Phytophthora agathidicida ICMP 17027
- NCBI: Phytophthora agathidicida P15175 submitted to NCBI as P. katsurae or P. cf katsurae
- Phytophthora DATABASE: Phytophthora agathidicida
- EPPO-Q-bank: Phytophthora agathidicida
- BOLDSYSTEMS: Phytophthora agathidicida
Position in ITS phylogenetic tree
Clade 5
Genome sequence of ex-type
Phytophthora agathidicida strain: NZFS 3770
Morphological identification
adapted from Weir et al. (2015)
Colonies and cardinal temperatures
Colony morphology after 7 days in V8-A, PDA, and MEA is non-distinctive pattern. Minimum growth temperature 6°C, maximum 25°C, and optimum 21.5°C.
Conditions for growth and sporulation
Oogonia quickly produced (3–4 days) and abundant on V8A.
Asexual phase
Sporangia papillate, persistent, globose to ovoid-ellipsoid (12–50 μm width, and 15–75 μm length), borne terminally from irregular branched or unbranched sporangiophores and could be formed via internal proliferation. Hyphal swellings simple with slight swellings. Chlamydospores absent.
Sexual phase
Homothallic. Oogonia globose (32 μm diam) with wall ornamentation mildly stipulate (small protuberances). Antheridia amphigynous, globose, some with knots at the base. Oospores plerotic, nearly filling the oogonia, with a mean diameter 28 μm.
Observations in specimen P. agathidicida CPHST BL 154 in hemp seed agar + oil: Oogonia globose (32–40 μm diam), with wavy wall ornamentation, and mostly with tapered bases (same character observed in photos of original publication of Weir et al. 2015). Antheridia amphigynous, sometimes with digitate projections. Oospores thick-walled and plerotic (28–36 μm diam).
Most typical characters
Phytophthora agathidicida differs from other Phytophthora clade 5 species in its oogonium ornamentation with occasional and slightly raised protuberances, and its larger mean oospore diameter (28 μm).
Additional specimen(s) evaluated
Phytophthora agathidicida CPHST-BL 154 (Abad) = ex-type P15175 [World Phytophthora Collection (WPC) California, USA]
Hosts and distribution
Distribution: northern New Zealand
Substrate: tree trunks
Disease note: canopy thinning - little leaf syndrome, collar-rot of lower trunk, girdling, bleeding lesions
Host: kauri (Agathis australis) trees and associated soil
Retrieved January 19, 2018 from U.S. National Fungus Collections Nomenclature Database.
Additional references and links
- Phytophthora DATABASE: Phytophthora agathidicida
- EPPO-Q-bank: Phytophthora agathidicida
- SMML USDA-ARS: Phytophthora agathidicida
- EPPO Global Database: Phytophthora agathicida
- Forest Phytophthoras of the World: Phytophthora agathidicida
- CABI Invasive Species Compendium: Phytophthora agathidicida
- Encyclopedia of Life (EOL): Phytophthora agathidicida
- Index Fungorum (IF): Phytophthora agathidicida
- Plantwise Knowledge Bank: Phytophthora agathidicida
- Google All Phytophthora agathidicida
- Google Images Phytophthora agathidicida
- Google Scholar Phytophthora agathidicida
- Google All Phytophthora taxon agathis
- Google Images Phytophthora taxon agathis
- Google Scholar Phytophthora taxon agathis
Fact sheet author
Z. Gloria Abad, Ph.D., USDA-APHIS-PPQ-S&T Beltsville Laboratory, United States of America