Phytophthora glovera

Name and publication

Phytophthora glovera Z.G. Abad & Shew (2011)

Abad ZG, Ivors KL, Gallup CA, Abad JA and Shew HD. 2011. Morphological and molecular characterization of Phytophthora glovera sp. nov. from tobacco in Brazil. Mycologia 103: 341–350.

Corresponding author: gloria.abad@aphis.usda.gov

Nomenclature

from Abad et al. (2011)

Mycobank

MB514015

Etymology

Named to honor Mr. Derald Glover who worked in David Shew’s laboratory at the Dept. of Plant Pathology, NCSU from 1966 to 1999. Mr. Glover’s initial observation of Phytophthora-like sporangia on the symptomatic roots of tobacco in water led to the initial isolation of the pathogen and the discovery of this new species.

Typification

Type: BRAZIL, Santa Catarina state close to Chapeco in southern part of Brazil from Nicotiana tabacum (tobacco ‘burley’ field) showing symptoms of ‘Amarelâo’, 10 Aug. 1995, collector David Shew; isolate 11099 #23, BPI 878720 (dried culture on baby carrot agar)

Ex-type: CBS 121969 and P11685 (WPC)

Sequences for ex-type in original manuscript: CBS 121969 = ITS AF279124

Ex-type in other collections

CBS 121969 = P11685 (WOC/WPC) = isolate 11099 #23, CPHST BL 36 (Abad)

Molecular identification

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

Phytophthora glovera isolate CPHST BL 36 (= P11685 WPC) = ITS rDNA MG865500, COI MH136895

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

Clade 2b

Morphological identification

Colonies and cardinal temperatures

Colony morphology after 7 days on PDA, V-8, MEA with light stellate pattern and slow growth. Minimum growth temperature 13°C, optimum 25°C, and maximum 30°C.

Conditions for growth and sporulation

Sporangia are readily produced on sections of infected root pieces or agar plugs under water culture, 10% soil solution, and on solid media.

Asexual phase

Sporangia semipapillate; persistent; ovoid, obpyriform, obclavate, subglobose, to irregular and distorted shapes (43–61 L x 26–36 W µm), occasionally with bilobed or trilobed apices, some showing prominent papilla before liberation of zoospores produced in unbranched or simple sympodial sporangiophores. Hyphal swellings absent. Chlamydospores absent.

Sexual phase

Homothallic. Oogonia smooth-walled (26–41 µm diam); antheridia paragynous or amphigynous with two antheridia per oogonium sometimes produced; finger-like projections frequently observed; oospores markedly aplerotic (23–30 µm diam).

Most typical characters

Phytophthora glovera is characterized by the presence of antheridia paragynous or amphigynous with two antheridia per oogonium sometimes produced.

Specimen (s) evaluated

Phytophthora glovera ex-type CPHST BL 36, duplicate of P11685 (World Phytophthora Collection)

Hosts and distribution

Distribution: South America (Brazil)
Substrate: roots
Disease note: root rot, stunting
Host: Nicotiana tabacum (Solanaceae)

Retrieved January 30, 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