Name and publication
Phytophthora constricta Rea, Stukely & Jung (2011)
Rea AJ, Burgess TI, Hardy GE StJ, Stukely MJC, and Jung T. 2011. Two novel and potentially endemic species of Phytophthora associated with episodic dieback of Kwongan vegetation in the south-west of Western Australia. Plant Pathol. 60: 1055–1068.
Corresponding author: firstname.lastname@example.org
from Rea et al. (2011)
refers to the fragile constriction of most sporangiophores towards the sporangial base
Type: AUSTRALIA, Fitzgerald River National Park, isolated from soil sample collected in dying native Kwongan vegetation, August 2006, M. Stukely. Holotype: MURU 454 (dried culture on V8A in the Herbarium of Murdoch University, Western Australia)
Ex-type: CBS 125801 and VHS 16130
Ex-type in other collections
Voucher sequences for barcoding genes (ITS rDNA and COI) of the ex-type (see Molecular protocols page)
Sequences for ex-type in other sources
- NCBI: Phytophthora constricta CPHST BL 61
- NCBI: Phytophthora constricta CBS 125801
- Phytophthora DATABASE: Phytophthora constricta PD-02826 = CBS 125801
- EPPO-Q-bank: Phytophthora constricta
- BOLDSYSTEMS: Phytophthora constricta (barcoding COI & ITS)
Position in ITS phylogenetic tree
Colonies and cardinal temperatures
Colony morphology is petaloid on CA, V8A, MEA, and PDA. Minimum growth temperature 5°C, optimum 22.5°C, and maximum 32.5°C.
Conditions for growth and sporulation
Sporangia are nonpapillate, persistent, and ovoid to broad-ovoid in shape. Sporangia average 59.8 ± 8.7 x 48.8 ± 7.4 mm (total range 39.1–83.9 x 31.4–68.8 mm). Sporangiophores in simple sympodia, constricted towards the base of the sporangium, with internal proliferation, both nested and extended. Hyphal swellings ellipsoid, but rare. Chlamydospores absent.
Homothallic. Oogonia are predominantly globose with smooth walls, although elongated and eccentric oogonia are observed, average size 48.0 ± 4.8 mm (31.8–59.6 µm). Oospores are slightly aplerotic, globose, turning pale golden-brown on maturity, average size 40.4 ± 4.3 µm (23.8–49.8 µm). Antheridia are paragynous.
Most typical characters
Australia; Western Australia, Fitzgerald River National Park, isolated from soil sample collected in dying native kwongan vegetation, August 2006, M. Stukely CBS 125801 = VHS 16130; VHS 16127; VHS 16134; from Banksia cirsioides, VHS 16125; from Banksia falcate, DDS 3543; Nannup, from Pinus radiata, July 1980, DCE 177; MJS186
Additional isolates CPHST BL 61 = P19614 WPC
Hosts and distribution
Substrate: roots, collar; isolated from soil
Disease note: root and collar rot
Retrieved January 29, 2018 from U.S. National Fungus Collections Nomenclature Database.
Distribution: Western Australia and Victoria
Substrate: roots, collars, and rhizosphere soil
Disease note: pathogenic toward Banksia attenuata
Hosts: numerous Proteaceous plant species including Banksias spp., Hakea spp., Adenanthos spp., and Isopogon spp.
Additional references and links
Burgess TI, Webster JL, Ciampini JA, White DW, Hardy GESJ, Stukely MJC. 2009. Re-evaluation of Phytophthora species isolated during 30 years of vegetation health surveys in Western Australia using molecular techniques. Plant Disease 93, 215-223.
- Phytophthora DATABASE: Phytophthora constricta
- EPPO-Q-bank: Phytophthora constricta
- SMML USDA-ARS: Phytophthora constricta
- EPPO Global Database: Phytophthora constricta
- Forest Phytophthoras of the world: Phytophthora constricta
- CABI Invasive Species Compendium: Phytophthora constricta
- Encyclopedia of Life (EOL): Phytophthora constricta
- Index Fungorum (IF): Phytophthora constricta
- Plantwise Knowledge Bank: Phytophthora constricta
- Google All Phytophthora constricta
- Google Images Phytophthora constricta
- Google Scholar Phytophthora constricta
Fact sheet authors
Treena Burgess, Ph.D., Centre for Phytophthora Science and Management, School of Biological Sciences and Biotechnology, Murdoch University, Australia; Z. Gloria Abad, Ph.D., USDA-APHIS-PPQ-S&T Beltsville Laboratory, United States of America