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Phylogenetic placement of the sugarcane orange rust pathogen Puccinia kuehnii in a historical and regional context

Braithwaite, K.S., Croft, B.J., Magarey, R.C., & Scharaschkin, Tanya (2009) Phylogenetic placement of the sugarcane orange rust pathogen Puccinia kuehnii in a historical and regional context. Australasian Plant Pathology, 38(6), pp. 380-388.

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Abstract

Sugarcane orange rust, caused by Puccinia kuehnii, was once considered a minor disease in the Australian sugar industry. However, in 2000 a new race of the pathogen devastated the high-performing sugarcane cultivar Q124, and caused the industry Aus$150–210 million in yield losses. At the time of the epidemic, very little was known about the genetic and pathogenic diversity of the fungus in Australia and neighbouring sugar industries. DNA sequence data from three rDNA regions were used to determine the genetic relationships between isolates within two P. kuehnii collections. The first collection comprised only recent Australian field isolates and limited sequence variation was detected within this population. In the second study, Australian isolates were compared with isolates from Papua New Guinea, Indonesia, China and historical herbarium collections. Greater sequence variation was detected in this collection and phylogenetic analyses grouped the isolates into three clades. All isolates from commercial cane fields clustered together including the recent Australianfield isolates and the Australian historical isolate from 1898.The other two clades included rust isolates from wild and garden canes in Indonesia and PNG. These rusts appeared morphologically similar to P. kuehnii and could potentially pose a quarantine threat to the Australian sugar industry. The results have revealed greater diversity in sugarcane rusts than previously thought.

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2 citations in Web of Science®

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ID Code: 28111
Item Type: Journal Article
Keywords: Basidiomycete, intergenic spacer, internal transcribed spacer, large subunit, quarantine, Saccharum
DOI: 10.1071/AP09012
ISSN: 0815-3191
Subjects: Australian and New Zealand Standard Research Classification > BIOLOGICAL SCIENCES (060000) > EVOLUTIONARY BIOLOGY (060300) > Phylogeny and Comparative Analysis (060309)
Divisions: Past > Schools > Biogeoscience
Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2009 Australasian Plant Pathology Society
Deposited On: 22 Oct 2009 12:16
Last Modified: 01 Mar 2012 00:08

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