Phytophthora iranica

Name and publication

Phytophthora iranica Ershad (1971)

Ershad D. 1971. Beitrag zur Kenntnis der Phytophthora Arten in Iran und ihrer Phytopathlogischen Bedeutung (Contribution to the knowledge of Phytophthora species in Iran and their phytopathogenic importance). Mitt. Biol. Bundesanst. Land Forstwirtsch. Berl. Dahlem 140: 1–90 (pgs 60–64).





from Ershad (1971)

Type: IRAN, Varamin, Teheran, from roots of eggplant, aubergine (Solanum melongena) collected in May 1969, D. Ershad CBS H-7642, isolate no. 51

Ex-type: CBS 374.72

Ex-type in other collections

CBS 374.72 = P3882 (WOC/WPC), IMI 158964, ATCC 60237, H401, CPHST BL 40 (Abad), 61J4 (Yang)

Molecular identification

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

Phytophthora iranica isolate CPHST BL 40 (= P3882 WPC) = ITS rDNA MG865519, COI MH136913

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

Clade 1b

Morphological identification

Colonies and cardinal temperatures

Colony morphology after 7 days of growth on V8 agar with light stellate pattern, on PDA and MEA with no distinct pattern. Minimum temperature for growth is 9°C, optimum 24–30°C, and maximum 33°C.

Conditions for growth and sporulation
Asexual phase

Sporangia papillate, mostly persistent but sometimes caducous with medium length pedicel, sometimes bi- and tripapillate, showing many short radiating hyphae and conspicuous elongated necks; mostly ovoid or obpyriform, and occasionally ellipsoid to subspherical (26–87 L x 17–51 W µm); originated in short or long unbranched, or simple sympodial sporangiophores. Hyphal swellings occasionally produced, globose, subglobose, and radiating. Chlamydospores rarely produced (17–41 µm diam), mostly intercalary and rarely terminal. 

Sexual phase

Homothallic. Oogonia smooth-walled, subspherical (21–45 µm diam), some with tapered base; antheridia predominantly paragynous, sometimes up to three per oogonium, mostly with cylindrical shape, some with digitate projections; oospores aplerotic (15–37 µm diam), wall thick (1–5 µm thick).

Specimen(s) evaluated

Phytophthora iranica ex-type CPHST BL 40, duplicate of P3882 (World Phytophthora Collection), which is a duplicate of ex-type CBS 374.72

Hosts and distribution

Distribution: Asia (Iran). Reports from Italy are the new species Phytophthora italica.
Substrate: roots, fruits, tubers
Disease note: root and stem rot, tuber soft rot
Host: Solanum melongena (eggplant); Solanum tuberosum (potato), Solanum lycopersicum (tomato), all Solanaceae, and Beta vulgaris (sugar beet, Chenopodiaceae) are infected when inoculated. Reports on Myrtus (Myrtaceae) are Phytophthora italica.

Retrieved January 31, 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