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Population genetics of the wheat curl mite (Aceria tosichella Keifer) in Australia: implications for the management of wheat pathogens

Published online by Cambridge University Press:  26 October 2011

A.D. Miller*
Affiliation:
Department of Zoology, The University of Melbourne, Parkville, Victoria, 3010Australia School of Life and Environmental Sciences, Deakin University, Warrnambool, Victoria, 3280Australia
P.A. Umina
Affiliation:
Department of Zoology, The University of Melbourne, Parkville, Victoria, 3010Australia
A.R. Weeks
Affiliation:
Department of Genetics, The University of Melbourne, Parkville, Victoria, 3010Australia
A.A. Hoffmann
Affiliation:
Department of Zoology, The University of Melbourne, Parkville, Victoria, 3010Australia Department of Genetics, The University of Melbourne, Parkville, Victoria, 3010Australia
*
*Author for correspondence Fax: +61 3 8344 2279 E-mail: admiller@unimelb.edu.au

Abstract

The wheat curl mite (WCM), Aceria tosichella Keifer, is a polyphagous eriophyoid mite and the primary vector of wheat streak mosaic virus (WSMV) and five other viral pathogens in cereals. Previous research using molecular markers and a series of laboratory experiments found A. tosichella in Australia to consist of two genetically distinct lineages, which have broad overlapping distributions and differ in their ability to transmit WSMV under controlled conditions. This pattern of transmission also appears to be apparent in the field, whereby a strong association between WSMV detection and a single WCM lineage has been detected. In this study, we conduct a population genetic analysis and provide information on the genetic structure of the Australian viruliferous WCM lineage. We assessed genetic differentiation of 16 WCM populations using nine microsatellite markers. Strong evidence for extensive gene flow and low genetic structuring throughout the Australian wheatbelt was evident, with an exception for Western Australian and far north Queensland populations that appear to be genetically isolated. The data also indicate genetic patterns consistent with an arrhenotokous parthenogenetic mode of reproduction. Implications of these findings are discussed with reference to the management of WCM and associated cereal pathogens in Australia and overseas.

Type
Research Paper
Copyright
Copyright © Cambridge University Press 2011

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