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Isolates of Citrus tristeza virus that overcome Poncirus trifoliata resistance comprise a novel strain

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Abstract

The economically important rootstock species Poncirus trifoliata is resistant to most isolates of Citrus tristeza virus (CTV), but not to members of the CTV resistance-breaking (RB) strain presently found in New Zealand. In this study, five known and suspected RB isolates were separated from field mixtures, and their genomes were sequenced in full. It was found that the RB isolates are members of a single phylogenetically distinct clade with an average of 90.3% genomic nucleotide sequence identity to the closest extant isolate, T36. These isolates also show evidence of multiple recombination events throughout their evolutionary history, with T36, T30 and VT-like isolates, and with each other. Finally, the genomic sequences of these isolates show that several genes contain unique polymorphisms that may or may not be involved in overcoming resistance. These data will aid in the understanding of host–virus interactions, and the mechanism of resistance in P. trifoliata.

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Acknowledgments

The authors would like to thank N. Tama, University of Auckland (Ret.), for assistance in transmission and maintenance of the virus isolates. S.J. Harper was funded by a Bright Future Top Achiever Doctoral Scholarship from New Zealand Tertiary Education Commission.

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Authors and Affiliations

  1. School of Biological Sciences, University of Auckland, Auckland, 1010, New Zealand

    S. J. Harper & M. N. Pearson

  2. The New Zealand Institute of Plant and Food Research Limited, Kerikeri, 0294, New Zealand

    T. E. Dawson

  3. Plant Health and Environment Laboratory, MAF Biosecurity New Zealand, Auckland, New Zealand

    S. J. Harper

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  1. S. J. Harper
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Correspondence to S. J. Harper.

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Harper, S.J., Dawson, T.E. & Pearson, M.N. Isolates of Citrus tristeza virus that overcome Poncirus trifoliata resistance comprise a novel strain. Arch Virol 155, 471–480 (2010). https://doi.org/10.1007/s00705-010-0604-5

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