Name and publication
Phytophthora gregata Jung, Stukely & Burgess (2011)
Jung T, Stukely MJC, Hardy GE StJ, White MD, Paap T, Dunstan WA, and Burgess TI. 2011. Multiple new Phytophthora species from ITS Clade 6 associated with natural ecosystems in Australia: evolutionary and ecological implications. Persoonia 13: 13–39.
from Jung et al. (2011)
Synonyms: was referred to as P.sp.7 by Burgess et al. (2009) and as taxon raspberry by Brasier et al. (2003)
refers to the abundant hyphal aggregations regularly formed by all isolates (gregata Latin = aggregated, in clumps)
Type: WESTERN AUSTRALIA, Busselton, from rhizosphere soil of dying Patersonia sp., 2009, VHS, holotype MURU 462 (dried culture on V8A, Herbarium of Murdoch University, Western Australia)
Ex-type: CBS 127952 and VHS 21962
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 gregata CPHST BL 37
- NCBI Phytophthora gregata CBS 127952
- Phytophthora DATABASE: Phytophthora gregata VHS 21962 = PD_02723
- EPPO-Q-bank: Phytophthora gregata CBS 127952
- BOLDSYSTEMS: Phytophthora gregata (barcoding COI & ITS)
Position in ITS phylogenetic tree
Colonies and cardinal temperatures
Colony morphology is faintly striate, stellate, or uniform on V8A, CA, MEA and PDA, but growth is denser on MEA and PDA. Minimum growth temperature 7.5°C, optimum 25°C, and maximum 32.5°C.
Conditions for growth and sporulation
Sporangia are nonpapillate, persistent, and usually ovoid or limoniform in shape. Sporangia average 51.0 ± 13.8 × 30.5 ± 5.9 μm (overall range 25.7–102.3 × 14.8–50.7 μm). Sporangiophores usually in simple sympodia and internal proliferation, both nested and extended, occurs in chains. Hyphal swellings are abundant as were hyphal aggregations. Chlamydospores absent.
Homothallic. Oogonia are globose, often with a tapering base, with smooth walls turning golden brown on maturity, average size 36.8 ± 4.1 mm (23.9–50.9 µm). Oospores are aplerotic, globose, with a large ooplast and thick walls, average size 31.6 ± 4.0 µm (21.4–45.3). Antheridia paragynous.
Most typical characters
Australia, Western Australia, Busselton, from rhizosphere soil of dying Patersonia sp., 2009, VHS, CBS 127952 = VHS 21962; from dying Hakea sp. VHS 21961; Lancelin, from Xanthorrhoea preissii, 2001, VHS 9854; Byford, from native forest, 1995, DCE68; Scott River, 2009, VHS 21992; Cataby, from dying Banksia prionotes, 1996, HSA 2356; Nannup, from rhizosphere of Pinus radiata, 1981, MJS 235; MJS 238; Victoria, Toolangi State Forest, from rhizosphere of a Eucalyptus sp., 2008, MUCC 759; Devlins Bridge from pasture, 2008, MUCC 760
Additional isolates: CPHST BL 37 = P19588 WPC
Hosts and distribution
Distribution: Australia, North America (USA: OR)
Substrate: associated with roots of dying plants
Host: diverse hard and softwood posts
Retrieved January 30, 2018 from U.S. National Fungus Collections Nomenclature Database.
Distribution: Western Australia, Victoria
Substrate: roots, collars, and rhizosphere soil
Disease note: No pathogenicity trials have been conducted.
Hosts: rarely isolated in associated with other Phytophthora species in rhizosphere soil collected in wetter areas
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.
Brasier CM, Cooke DEL, Duncan JM, Hansen EM. 2003. Multiple new phenotypic taxa from trees and riparian ecosystems in Phytophthora gonapodyides – P. megasperma ITS Clade 6, which tend to be high-temperature tolerant and either inbreeding or sterile. Mycological Research 107: 277–290.
- Phytophthora DATABASE: Phytophthora gregata
- EPPO-Q-bank: Phytophthora gregata
- SMML USDA-ARS: Phytophthora gregata
- EPPO Global Database: Phytophthora gregata
- Forest Phytophthoras of the world: Phytophthora gregata
- CABI Invasive Species Compendium: Phytophthora gregata
- Encyclopedia of Life (EOL): Phytophthora gregata
- Index Fungorum (IF): Phytophthora gregata
- Plantwise Knowledge Bank: Phytophthora gregata
- Google All Phytophthora gregata
- Google Images Phytophthora gregata
- Google Scholar Phytophthora gregata
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