Panel of real-time PCRs for the multiplexed detection of two tomato-infecting begomoviruses and their cognate whitefly vector species

Authors

  • S. L. van Brunschot,

    Corresponding author
    1. School of Agriculture and Food Sciences, The University of Queensland, St Lucia, Qld, Australia
    • Cooperative Research Centre for National Plant Biosecurity, Bruce, ACT, Australia
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  • C. F. Gambley,

    1. Queensland Department of Agriculture, Fisheries and Forestry, Ecosciences Precinct, Dutton Park, Qld, Australia
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  • P. J. De Barro,

    1. CSIRO Ecosystem Sciences, Ecosciences Precinct, Dutton Park, Qld, Australia
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  • R. Grams,

    1. Queensland Department of Agriculture, Fisheries and Forestry, Toowoomba, Qld, Australia
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  • J. E. Thomas,

    1. Cooperative Research Centre for National Plant Biosecurity, Bruce, ACT, Australia
    2. Centre for Plant Science, Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St Lucia, Qld, Australia
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  • J. Henderson,

    1. Centre for Plant Science, Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St Lucia, Qld, Australia
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  • A. Drenth,

    1. Centre for Plant Science, Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St Lucia, Qld, Australia
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  • A. D. W. Geering

    1. Cooperative Research Centre for National Plant Biosecurity, Bruce, ACT, Australia
    2. Centre for Plant Science, Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St Lucia, Qld, Australia
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E-mail: sharon.vanbrunschot@uqconnect.edu.au

Abstract

A new approach for the simultaneous identification of the viruses and vectors responsible for tomato yellow leaf curl disease (TYLCD) epidemics is presented. A panel of quantitative multiplexed real-time PCR assays was developed for the sensitive and reliable detection of Tomato yellow leaf curl virus-Israel (TYLCV-IL), Tomato leaf curl virus (ToLCV), Bemisia tabaci Middle East Asia Minor 1 species (MEAM1, B biotype) and B. tabaci Mediterranean species (MED, Q biotype) from either plant or whitefly samples. For quality-assurance purposes, two internal control assays were included in the assay panel for the co-amplification of solanaceous plant DNA or B. tabaci DNA. All assays were shown to be specific and reproducible. The multiplexed assays were able to reliably detect as few as 10 plasmid copies of TYLCV-IL, 100 plasmid copies of ToLCV, 500 fg B. tabaci MEAM1 and 300 fg B. tabaci MED DNA. Evaluated methods for routine testing of field-collected whiteflies are presented, including protocols for processing B. tabaci captured on yellow sticky traps and for bulking of multiple B. tabaci individuals prior to DNA extraction. This work assembles all of the essential features of a validated and quality-assured diagnostic method for the identification and discrimination of tomato-infecting begomovirus and B. tabaci vector species in Australia. This flexible panel of assays will facilitate improved quarantine, biosecurity and disease-management programmes both in Australia and worldwide.

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