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Australasian Plant Pathology

, Volume 46, Issue 3, pp 267–275 | Cite as

The pandemic biotype of Austropuccinia psidii discovered in South America

  • G. M. Granados
  • A. R. McTaggartEmail author
  • I. Barnes
  • C. A. Rodas
  • J. Roux
  • M. J. Wingfield
Original Paper

Abstract

The rust fungus Austropuccinia psidii was recently reported from ornamental Corymbia citriodora and plantations of Eucalyptus in Colombia. It is unknown whether the genotypic diversity of the pathogen in Colombia reflects that of other countries in South America or if unique genotypes occur. Multilocus genotypes (MLG) were determined for collections of A. psidii from four host genera, Corymbia, Eucalyptus, Psidium and Syzygium in Colombia and compared to collections from Australia, Brazil, Indonesia, Paraguay and South Africa. The genotypic diversity of 58 samples on 15 genera of Myrtaceae was determined using seven microsatellite markers. Two lineages of A. psidii were detected among Colombian samples. These included a previously unknown genotype on Psidium guajava, different to those sampled from Brazil, as well as the pandemic biotype, which has spread to Pacific countries such as Australia, Hawaii and Indonesia. This is the first time the pandemic biotype of A. psidii has been found in South America where the rust is believed to be native. These findings raise questions with regard to the origin of the pandemic biotype of A. psidii and emphasise the threat that this biotype poses to forestry.

Keywords

Biosecurity Long distance dispersal Host adaptation Myrtaceae Myrtle rust Pucciniales 

Notes

Acknowledgements

We are grateful to Ms. Ximena Silva (University of Helsinki, Finland) and Dr. Geoff Pegg (Department of Agriculture, Fisheries and Forestry, Horticulture and Forestry Science, Agri-Science Queensland, Australia) for providing samples from Paraguay and Australia, respectively. We also acknowledge Smurfit Kappa Colombia (SKC), the National Research Foundation (NRF) of South Africa (Grant UID 78566), and members of the Tree Protection Co-operative Program (TPCP) based at the Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, South Africa for logistical and financial support.

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Copyright information

© Australasian Plant Pathology Society Inc. 2017

Authors and Affiliations

  1. 1.Department of Plant and Soil Sciences, Tree Protection Co-operative Programme (TPCP), Forestry and Agricultural Biotechnology Institute (FABI), Private Bag X20University of PretoriaPretoriaSouth Africa
  2. 2.Department of Genetics, TPCP, FABI, Private Bag X20University of PretoriaPretoriaSouth Africa
  3. 3.Forestry Health Protection ProgrammeSmurfitKappa ColombiaYumboColombia

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