Phytophthora gonapodyides (to be redescribed 2022)

Name and publication

Phytophthora gonapodyides (H. E. Petersen) Buisman (1927)

Buisman, C. J. 1927. Root rots caused by Phycomycetes. Mededelingen uit het Phytopathologisch laboratorium ‘Willie Commelin Scholten’ 11: 1–65.

Nomenclature

Mycobank

MB252402

Synonymy

Pythiomorpha gonapodyides H.E. Petersen, Botanisk Tidsskrift 29: 391 (1909) [MB162746]

Pythiomorpha gonapodyoides H.E. Petersen (1909) [MB528833]

Typification

from Buisman (1927)

Type: UNITED KINGDOM, in fallen submerged fruits of Pyrus malus and fallen branches of Alnus sp. (debris)

Ex-type: LOST

Well-authenticated specimen(s) selected by Gloria Abad: 

  • Selected specimen #1: CPHST BL 66 = P7050 (WPC) from vegetable debris, UNITED KINGDOM
  • Selected specimen #2: CPHST BL 172 = P6992 (WPC) from soil, UNITED STATES OF AMERICA
Selected specimen(s) in other collections

CPHST BL 66 (Abad) = P7050 (WPC) = ATCC 46726, Zentmyer P670

CPHST BL 172 = P6992 (WPC)

Molecular identification

Voucher sequences for barcoding genes (ITS rDNA and COI) of selected specimens (see Molecular protocols page)

Phytophthora gonapodyides isolate CPHST BL 66 (= P7050 WPC) = ITS rDNA MG865501, COI MH136896

Phytophthora gonapodyides isolate CPHST BL 172 (= P6992 WPC) = ITS rDNA MG865502, COI MH136897

Sequences for selected specimens in other sources
Position in ITS phylogenetic tree

Clade 6b

Morphological identification

Colonies and cardinal temperatures

Colony morphology after 7 days on PDA, V-8, and MEA with rosette pattern. Minimum growth temperature 3°C, optimum 24–27°C, and maximum 30°C.

Conditions for growth and sporulation

Sporangia and hyphal swellings are produced under water cultures.

Asexual phase

Sporangia nonpapillate; persistent; ellipsoid, ovoid or distorted shapes with tapered base (36–71 L x 21–32 W µm) showing internal extended and nested proliferation and produced in unbranched sporangiophores. Hyphal swellings globose, subglobose, and elongate produced solitary or catenulate in chains. Chlamydospores absent.

Sexual phase

Sterile.

Most typical characters

Phytophthora gonapodyides is characterized by the presence of sporangia showing internal nested proliferation and hyphal swellings.

Specimen(s) evaluated

Phytophthora gonapodyides CPHST BL 66, duplicate of P7050 (World Phytophthora Collection)

Hosts and distribution

Distribution: North America (USA), Europe (Denmark, Hungary, Italy, Sweden, Turkey); also reported from Australia, New Zealand, and South America (Chile)
Substrate: roots, seedlings
Disease note: root rot; a minor pathogen
Host: 13 genera in 11 families, including Malus spp. (Rosaceae); possibly also on Pinaceae seedlings including Pseudotsuga menziesii (Douglas fir), Abies spp., and Tsuga mertensiana (mountain hemlock)

Retrieved January 30, 2018 from U.S. National Fungus Collections Nomenclature Database.

Additional info: saprophyte

Additional references and links

Fact sheet author

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