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Australasian Plant Pathology

, Volume 41, Issue 2, pp 125–130 | Cite as

Peronosclerospora australiensis sp. nov. and Peronosclerospora sargae sp. nov., two newly recognised downy mildews in northern Australia, and their biosecurity implications

  • R. G. Shivas
  • M. J. Ryley
  • S. Telle
  • J. R. Liberato
  • M. Thines
Article

Abstract

Morphological examination, supported by unnamed phylogenetic lineages found previously from DNA sequence analysis, revealed the presence of two new downy mildews on native Sorghum spp. in northern Australia. These species are formally described and illustrated as Peronosclerospora australiensis sp. nov. and Peronosclerospora sargae sp. nov. One of these species, P. australiensis, was also found on cultivated maize. Oospores of P. australiensis were present on shredded leaves of the native Sorghum spp., and conidia and conidiophores were found on maize leaves with chlorotic streaks. We review earlier reports of downy mildew on maize and native Sorghum species in northern Australia and show that many of these records represent P. australiensis. The biosecurity implications of the absence of some downy mildews on grasses from Australia as well as the detection of new cryptic species are discussed.

Keywords

Quarantine Sarga Sorghum timorense Sorghum plumosum Taxonomy Zea mays 

Notes

Acknowledgements

The authors wish to thank Don Barrett (University of Queensland) for the Latin translation of the species descriptions. The present study was financially supported by the research funding programme “LOEWE—Landes-Offensive zur Entwicklung Wissenschaftlich-ökonomischer Exzellenz” of the Ministry of Higher Education, Research, and the Arts of Hesse.

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Copyright information

© Australasian Plant Pathology Society Inc. 2011

Authors and Affiliations

  • R. G. Shivas
    • 1
  • M. J. Ryley
    • 2
  • S. Telle
    • 3
  • J. R. Liberato
    • 4
  • M. Thines
    • 3
    • 5
  1. 1.Plant Pathology Herbarium, Ecosciences PrecinctBrisbaneAustralia
  2. 2.Agri-Science Queensland, Department of EmploymentEconomic Development and InnovationToowoombaAustralia
  3. 3.Senckenberg Gesellschaft für NaturforschungFrankfurt (Main)Germany
  4. 4.Plant Pathology SectionDepartment of ResourcesDarwinAustralia
  5. 5.Department of Biological Sciences, Institute of Ecology, Evolution and DiversityJohann Wolfgang Goethe UniversityFrankfurt (Main)Germany

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