Australasian Plant Pathology

, Volume 46, Issue 4, pp 369–378 | Cite as

Phytophthora versiformis sp. nov., a new species from Australia related to P. quercina

  • T. PaapEmail author
  • L. Croeser
  • D. White
  • S. Aghighi
  • P. Barber
  • G. E. St. J. Hardy
  • T. I. Burgess
Original Paper


During routine surveys of Corymbia calophylla, a widespread tree currently experiencing decline over a large area of its native range of south west Western Australia, a slow growing Phytophthora species was often recovered from roots and rhizosphere soil. This species grew more slowly, produced a wide array of morphological features and was visibly different to all other Phytophthora species present in Western Australia. Phylogenetic analyses of the ITS, cox1, HSP90, β-tubulin and NADH gene regions confirmed this to be a new species closely related to P. quercina and the provisional species P. ‘ohioensis’. The new species is described here as Phytophthora versiformis sp. nov. It produces persistent, papillate sporangia of variable shape, oogonia with thick-walled oospores, and paragynous antheridia. To date this species has only been recovered from C. calophylla. Pathogenicity trials indicate that while P. versiformis can infect the roots of C. calophylla it does not lead to seedling death.


Phytophthora phylogeny Tree decline Marri Phytophthora quercina Mediterranean ecosystem 



This work was supported by the Australian Research Council (Linkage Project 120,200,581) and conducted within the Western Australian State Centre of Excellence for Climate Change Woodland and Forest Health, which is a partnership between private industry, community groups, universities and the Government of Western Australia. We thank Ylimaz Balci for supplying us with isolates of P. ‘ohioensis’ and P. quercina.


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Copyright information

© Australasian Plant Pathology Society Inc. 2017

Authors and Affiliations

  • T. Paap
    • 1
    • 2
    Email author
  • L. Croeser
    • 1
  • D. White
    • 1
  • S. Aghighi
    • 1
    • 3
  • P. Barber
    • 1
    • 4
  • G. E. St. J. Hardy
    • 1
  • T. I. Burgess
    • 1
  1. 1.Centre for Phytophthora Science and Management, School of Veterinary and Life SciencesMurdoch UniversityMurdochAustralia
  2. 2.Department of Microbiology and Plant Pathology, Forestry and Agricultural Biotechnology InstituteUniversity of PretoriaPretoriaSouth Africa
  3. 3.Research and Technology Institute of Plant ProductionShahid Bahonar University of KermanKermanIran
  4. 4.Arbor Carbon Pty, Ltd.Willagee CentralAustralia

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