Phytophthora castanetorum

Name and publication

Phytophthora castanetorum Jung, Horta Hung, Bakonyi & Scanu (2017)

Jung T, Horta Jung M, Cacciola SO, Cech T, Bakonyi J, Seress D, Mosca S, Schena L, Seddaiu S, Pane A, Magnano di San Lio G, Maia C, Cravador A, Franceschini A, and Scanu B. 2017. Multiple new cryptic pathogenic Phytophthora species from Fagaceae forests in Austria, Italy and Portugal. IMA Fungus 8 (2): 219–244.

Corresponding author e-mail: bscanu@uniss.it

Nomenclature

from Jung et al. (2017)

Mycobank

MB819699

Etymology

referring to the association of this species with forests of Castanea sativa (Castanetum is the phytosociological term for a chestnut forest.)

Typification

Type: PORTUGAL, Algarve: Monchique, isolated from rhizosphere soil of a mature Castanea sativa tree, March 2015, T. Jung (CBS H-22983, holotype, dried culture on V8A)

Ex-type: CBS 142299 = BD 292

Sequences for ex-type: Phytophthora castanetorum isolate BD292 = ITS MF036182 and cox1 MF036266

Ex-type in other collections

CBS 142299 = BD 292 

Molecular identification

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

Phytophthora castanetorum isolate BD292 ITS rDNA MF036182

Sequences for ex-type in other sources
  • NCBI: Phytophthora castanetorum BD292
  • Phytophthora DATABASE: Phytophthora castanetorum
  • EPPO-Q-bank: Phytophthora castanetorum
  • BOLDSYSTEMS: Phytophthora castanetorum
Position in ITS phylogenetic tree

Clade 3b

Genome sequence

Phytophthora castanetorum strain ex-type ST_20191112 (= BL 201). Accession genome ASM1470611v1 reference, BioProject PRJNA640137, USDA-APHIS-PPQ-S&T (2020)

Morphological identification

adapted from Jung et al. (2017)

Colonies and cardinal temperatures

Colonies on V8-A, PDA, and MEA with uniform shape. Optimum growth temperature 25°C, maximum 30°C. 

Conditions for growth and sporulation

Sporangia commonly observed in solid agar of older cultures and produced abundantly in nonsterile soil extract. Gametangia readily produced in single culture by all isolates on V8A within 7–10 days.

Asexual phase

Sporangia semipapillate or nonpapillate; persistent; often forming a conspicuous basal plug that protrudes into the empty sporangium; ovoid, subglobose to globose, obpyriform, ellipsoid, or distorted (44.2–48.1 × 35.4–38.3 μm); originated on unbranched sporangiophores or in irregular lax or regular dense sympodia. Hyphal swellings small subglobose to limoniform, sometimes formed close to the sporangial base, sometimes catenulate, and often with individual or radiating hyphal extensions. Chlamydospores globose.

Sexual phase

Homothallic. Oogonia smooth-walled, elongated pyriform to ellipsoid (24.5–41.5 μm); antheridia almost exclusively paragynous and club-shaped to subglobose; oopores plerotic or aplerotic, thick-walled.

Hosts and distribution

Distribution: Europe (Italy, Portugal)
Substrate: rhizosphere soil
Disease note: pathogenic to roots in pathogenicity tests
Hosts: Castanea sativa (Fagaceae)

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

Additional references and links

  • Phytophthora DATABASE: Phytophthora castanetorum
  • EPPO-Q-bank: Phytophthora castanetorum
  • SMML USDA-ARS: Phytophthora castanetorum
  • EPPO Global Database: Phytophthora castanetorum
  • CABI Invasive Species Compendium: Phytophthora castanetorum
  • Encyclopedia of Life (EOL): Phytophthora castanetorum
  • Index Fungorum (IF): Phytophthora castanetorum
  • Plantwise Knowledge Bank: Phytophthora castanetorum

Fact sheet author

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