Phytophthora tentaculata Kröber & Marwitz (1993)

Kröber H and Marwitz R. 1993. Phytophthora tentaculata sp. nov. und Phytophthora cinnamomi var. parvispora var. nov. zwei neue Pilze von Deutschland. Z. Pflanzenk. Pflanzen. 100: 250–258.

from Kröber and Marwitz (1993)

Mycobank

MB360186

Etymology

tentaculatus = “tentacles elongated,” refers to the hypha of the diclinous antheridia

Typification

Type: GERMANY, from Chrysanthemum frutescens L. (Compositae), collected by R. Marwitz in Frankfurt/Main in 1990, BBA 65425 (Institut fur Mikrobiologie, Biologische Bundesanstalt für Land- und Forstwirtschaft, Berlin-Dahlem)

Ex-type: no code for the ex-type provided in the original manuscript

Ex-type in other collections

BBA 65425 = CBS 412.96, P8496 (WPC), CPHST BL 29 (Abad) 

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

Phytophthora tentaculata isolate CPHST BL 29 (= P8496 WPC) = ITS rDNA MG865591, COI MH136983

Sequences for ex-type in other sources

• NCBI: Phytophthora tentaculata CPHST BL 29
• NCBI: Phytophthora tentaculata P8496
• NCBI: Phytophthora tentaculata CBS 412.96
• Phytophthora Database: Phytophthora tentaculata PD_00180 = P8496
• Q-bank: Phytophthora tentaculata CBS 412.96
• BOLDSYSTEMS: Phytophthora tentaculata OOMYA2107 [COI-5P:624, ITS:792] = CBS 412.96 (barcoding COI & ITS)

Position in ITS phylogenetic tree

Clade 1b

Colonies and cardinal temperatures

Colony morphology on CMA, PDA, and V-8 agar with no distinctive pattern. The minimum temperature for growth is 6°C, optimum 20–25°C, and maximum 30°C.

Conditions for growth and sporulation

Oogonia form abundantly in culture.

Asexual phase

Sporangia papillate, some bipapillate; caducous with short pedicels; ovoid, obpyriform, or distorted shapes (25–60 µm length x 15–45 µm width) many with elongated necks; originated in unbranched or simple sympodial sporangiohores. Hyphal swellings are small, intercalary, and with radiating hyphae. Chlamydospores spherical (20–45 µm diam.), intercalary or terminal.

Sexual phase

Homothallic. Oogonia smooth-walled, globose (20–49 µm diam.); antheridia paragynous, one to two, rarely three per oogonium, spherical, ellipsoid, or irregular (20–35 µm), often attached distant from the oogonial stalk, diclinous antheridia very common, amphigynous antheridia occasionally produced; oospores plerotic, aplerotic, or slightly aplerotic, spherical (14–38 µm diam.).

Most typical characters

Phytophthora tentaculata is characterized by the presence of hyphal swellings and by the shape of the caducous sporangia.

Specimen(s) evaluated

Phytophthora tentaculata ex-type CPHST BL 29, duplicate of P8496 (World Phytophthora Collection)

Distribution: Asia (China), Europe (Italy, Spain, Germany), North America (USA: CA)
Substrate: roots, stems
Disease note: root rot, stem rot. Heavily infected plants are killed (Kroeber & Marwitz, 1993).
Host: Chrysanthemum spp., Santolina (Asteraceae), Mimulus aurantiacus (Phrymaceae), Verbena (Verbenaceae)

Retrieved February 01, 2018 from U.S. National Fungus Collections Nomenclature Database.

USA: This species was listed as a species of concern during the 2009 Phytophthora prioritization project conducted by USDA APHIS PPQ CPHST PERAL (Schwartzburg et al.).

Phytophthora tentaculata is also listed in the U.S. Regulated Plant Pest Table (last modified Nov. 15, 2017).

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

• Google All Phytophthora tentaculata
• Google Images Phytophthora tentaculata
• Google Scholar Phytophthora tentaculata

Fact sheet author

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