Abstract
Besides hop, Hop stunt viroid (HpSVd) infects many woody species including grapevine, citrus, peach, plum, apricot, almond, pomegranate, mulberry and jujube. Here, we report the first detection of HpSVd in pistachio (Pistacia vera L.). Samples corresponding to 16 pistachio cultivars were obtained from a nearby almond collection. From these samples, low molecular weight RNAs were extracted for double polyacrylamide gel electrophoresis, northern-blot analysis and reverse transcription polymerase chain reaction assays. HpSVd was detected in 4 of the 16 pistachio cultivars in the first year and in 6 in the second, being also detected in the almond collection. Examination of the nucleotide sequences of pistachio and almond isolates revealed 13 new sequence variants. Sequences from pistachio shared 92–96 % similarity with the first reported HpSVd sequence (GenBank X00009), and multiple alignment and phylogenetic analyses showed that one pistachio isolate (HpSVdPis67Jabari) clustered with the plum group, whereas all the others clustered with the hop, and the recombinants plum-citrus and plum-Hop/cit3 groups. By identifying pistachio as a new natural host, we confirm that HpSVd is an ubiquitous and genetically variable viroid that infects many different fruit trees cultivated worldwide.
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Acknowledgments
We are grateful to R. Flores (CSIC-Universidad Politécnica de Valencia, Spain) for helpful discussions, critical reading of the manuscript and the plasmids kindly supplied. This work was partly supported by the collaborative Hispano-Tunisian program from the AECID (Agencia Espanola de cooperación internacional y Desarrollo) and the Tunisian Ministry of Higher Education, Scientific Research and Technology.
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Elleuch, A., Hamdi, I., Ellouze, O. et al. Pistachio (Pistacia vera L.) is a new natural host of Hop stunt viroid . Virus Genes 47, 330–337 (2013). https://doi.org/10.1007/s11262-013-0929-8
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DOI: https://doi.org/10.1007/s11262-013-0929-8