Phytophthora niederhauserii sp. nov., a polyphagous species associated with ornamentals, fruit trees and native plants in 13 countries

Z. Gloria Abad, Jorge A. Abad, Santa Olga Cacciola, Antonella Pane, Roberto Faedda, Eduardo Moralejo, Ana Pérez-Sierra, Paloma Abad-Campos, Luis A. Alvarez-Bernaola, József Bakonyi, András Józsa, Maria Luz Herrero, Treena I. Burgess, James H. Cunnington, Ian W. Smith, Yilmaz Balci, Cheryl Blomquist, Béatrice Henricot, Geoffrey Denton, Chris SpiesAdele Mcleod, Lassaad Belbahri, David Cooke, Koji Kageyama, Seiji Uematsu, Ilker Kurbetli, Deǧirmenci Kemal Deǧirmenci

Research output: Contribution to journalArticlepeer-review

45 Scopus citations


A non-papillate, heterothallic Phytophthora species first isolated in 2001 and subsequently from symptomatic roots, crowns and stems of 33 plant species in 25 unrelated botanical families from 13 countries is formally described here as a new species. Symptoms on various hosts included crown and stem rot, chlorosis, wilting, leaf blight, cankers and gumming. This species was isolated from Australia, Hungary, Israel, Italy, Japan, the Netherlands, Norway, South Africa, Spain, Taiwan, Turkey, the United Kingdom and United States in association with shrubs and herbaceous ornamentals grown mainly in greenhouses. The most prevalent hosts are English ivy (Hedera helix) and Cistus (Cistus salvifolius). The association of the species with acorn banksia (Banksia prionotes) plants in natural ecosystems in Australia, in affected vineyards (Vitis vinifera) in South Africa and almond (Prunus dulcis) trees in Spain and Turkey in addition to infection of shrubs and herbaceous ornamentals in a broad range of unrelated families are a sign of a wide ecological adaptation of the species and its potential threat to agricultural and natural ecosystems. The morphology of the persistent non-papillate ellipsoid sporangia, unique toruloid lobate hyphal swellings and amphigynous antheridia does not match any of the described species. Phylogenetic analysis based on sequences of the ITS rDNA, EF-1a, and b-tub supported that this organism is a hitherto unknown species. It is closely related to species in ITS clade 7b with the most closely related species being P. sojae. The name Phytophthora niederhauserii has been used in previous studies without the formal description of the holotype. This name is validated in this manuscript with the formal description of Phytophthora niederhauserii Z.G. Abad et J.A. Abad, sp. nov. The name is coined to honor Dr John S. Niederhauser, a notable plant pathologist and the 1990 World Food Prize laureate.

Original languageEnglish
Pages (from-to)431-447
Number of pages17
Issue number3
StatePublished - 2014


  • B-tub
  • EF-1a
  • ITS
  • Oomycetes
  • Plant pathogen
  • Straminipila
  • Taxonomy


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