Name and publication

Phytophthora dauci Bertier, H. Brouwer & De Cock (2013)

Bertier L, Brouwer H, de Cock AWAM, Cooke DEL, Olsson CHB, and Höfte M. 2013. The expansion of Phytophthora Cladeclade:
a taxonomic group of organisms classified together on the basis of homologous features traced to a common ancestor
8b: three new species associated with winter grown vegetable crops. Persoonia 31: 63–76.

Corresponding author e-mail: monica.hofte@ugent.be

Nomenclature

from Bertier et al. (2013)

Mycobank

MB803103

Etymology

named after the host plant, Daucus carota (carrot)

Typification

Type: FRANCE, from root of Daucus carota, collected by D. Breton in 2009, holotype CBS H-21128 (dried culture)

Ex-type: CBS 127102

Sequences for ex-type in original manuscript: Phytophthora dauci CBS 127102 ITS rDNA: KC478761, Cox1: KC478731

Ex-type in other collections

(ET) CBS 127102, WPC P19845 P19879, S&T BL 96 (Abad), 61E5 (Hong), AdC 10.010, BorSP370

Molecular identification

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

Phytophthora dauci isolate CBS 127102 ITS rDNA KC478761

Voucher sequences for Molecular Toolbox with seven genes (ITS, β-tub, COI, EF1α, HSP90, L10, and YPT1

(see Molecular protocols page) (In Progress)

Voucher sequences for Metabarcoding High-throughput Sequencing (HTS) Technologies [Molecular Operational Taxonomic Unit (MOTU)]

(see Molecular protocols page) (In Progress)

Sequences with multiple genes for ex-type in other sources

• NCBI: Phytophthora dauci CBS 127102
• NCBI: Phytophthora dauci 61E5
• EPPO-Q-bank: Phytophthora dauci CBS 127102
• BOLDSYSTEMS: Phytophthora dauci (barcoding COI & ITS)

Position in multigenic phylogeny with 7 genes (ITS, β-tub, COI, EF1α, HSP90, L10, and YPT1)

Clade clade:
a taxonomic group of organisms classified together on the basis of homologous features traced to a common ancestor
8b

Morphological identification

adapted from Bertier et al. (2013)

Colonies and cardinal temperatures

Colonies on CMA, V8, and PDA with no distinctive pattern. On both V8 and PDA, colonies have a well-defined edge. Minimum temperature for growth 3°C, optimum 15–18°C, and maximum 23°C.

Asexual phase

SporangiaSporangia:
sac within which zoospores form, especially when water is cooled to about 10°C below ambient temperature; in solid substrates, sporangia usually germinate by germ tubes
are semipapillatesemipapillate:
pertaining to the production of shallow having papilla that are not well developed, shallow and less nipple-like than fully papillate structures
and nonpapillatenonpapillate:
pertaining to the production of a non-distinct, or inconspicuous, papilla at the distal end of the sporangium (cf. papillate and semipapillate)
, persistentpersistent:
pertaining to sporangia that remain attached to the sporangiophore and do not separate or detach easily (cf. caducous)
, ovoidovoid:
egg-shaped, with the widest part at the base of the sporangium and the narrow part at the apex
, and ellipsoidellipsoid:
refers to a solid body that forms an ellipse in the longitudinal plane and a circle in cross section; many fungal spores are ellipsoidal or elliptic
(47–70 × 43–47 μm), originated in unbranched sporangiophores. Hyphal swellings sub-globose, ellipsoidellipsoid:
refers to a solid body that forms an ellipse in the longitudinal plane and a circle in cross section; many fungal spores are ellipsoidal or elliptic
, catenulatecatenulate:
having a chain-like form
, and branching. ChlamydosporesChlamydospores:
an asexual spore with a thickened inner wall that is delimited from the mycelium by a septum; may be terminal or intercalary, and survives for long periods in soil
slightly subglobose, intercalaryintercalary:
positioned within a hypha (cf. terminal)
, thin-walled, and rarely produced on CMA.

Sexual phase

Homothallic. OogoniaOogonia:
the female gametangium in which the oospore forms after fertilization by the antheridium
globoseglobose:
having a rounded form resembling that of a sphere
, often intercalaryintercalary:
positioned within a hypha (cf. terminal)
, and with smooth or wavy walls (30–35 × 29–34 μm); antheridiaantheridia:
the male gametangium; a multinucleate, swollen hyphal tip affixed firmly to the wall of the female gametangium (the oogonium)
paragynousparagynous:
pertaining to the sexual stage in which the antheridium is attached to the side of the oogonium (cf. amphigynous)
with apical insertion (14–18 x 10–13 μm), commonly intercalaryintercalary:
positioned within a hypha (cf. terminal)
; oosporesoospores:
zygote or thick-walled spore that forms within the oogonium after fertilization by the antheridium; may be long-lived
plerotic/aplerotic (25–30 μm diam).

Most typical characters

Phytophthora dauci is characterized by the presence of some oogoniaoogonia:
the female gametangium in which the oospore forms after fertilization by the antheridium
with wavy walls.

Additional specimen(s) evaluated

Phytophthora dauci ex-type CPHST BL 96, duplicate of P19845 (World Phytophthora Collection), which is a duplicate of ex-type CBS 127102

Hosts and distribution

Distribution: Australia, Europe (France)
Substrate: isolated from roots
Disease note: leaf blight.
Hosts: Daucus carota (Apiaceae)

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

Additional references and links

 

• SMML USDA-ARS: Phytophthora dauci
• EPPO Global Database: Phytophthora dauci
• Forest Phytophthoras of the world: Phytophthora dauci
• CABI Digital Library: Phytophthora dauci
• Encyclopedia of Life (EOL): Phytophthora dauci
• Index Fungorum (IF): Phytophthora dauci

 

• Google All Phytophthora dauci
• Google Images Phytophthora dauci
• Google Scholar Phytophthora dauci

Fact sheet author

Z. Gloria Abad, Ph.D., USDA-APHIS-PPQ-S&T Plant Pathogen Confirmatory Diagnostics Laboratory (PPCDL), United States of America.