Phytophthora dauci

Name and publication

Phytophthora dauci Bertier, Brouwer & De Cock (2013)

Bertier L, Brouwer H, de Cock AWAM, Cooke DEL, Olsson CHB, and Höfte M. 2013. The expansion of Phytophthora Clade 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

CBS 127102 = P19845 (WPC), P19879 (WPC), AdC 10.010, BorSP370, CPHST BL 96 (Abad), 61E5 (Yang)

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

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

Clade 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

Sporangia are semipapillate and nonpapillate, persistent, ovoid, and ellipsoid (47–70 × 43–47 μm), originated in unbranched sporangiophores. Hyphal swellings sub-globose, ellipsoid, catenulate, and branching. Chlamydospores slightly subglobose, intercalary, thin-walled, and rarely produced on CMA.

Sexual phase

Homothallic. Oogonia globose, often intercalary, and with smooth or wavy walls (30–35 × 29–34 μm); antheridia paragynous with apical insertion (14–18 x 10–13 μm), commonly intercalary; oospores plerotic/aplerotic (25–30 μm diam).

Most typical characters

Phytophthora dauci is characterized by the presence of some oogonia 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

Fact sheet author

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