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Synergistic interaction between Potato spindle tuber viroid and Cucumber mosaic virus in tomato (Abstract in rivista)

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Synergistic interaction between Potato spindle tuber viroid and Cucumber mosaic virus in tomato (Abstract in rivista) (literal)

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TORCHETTI E.M., NAVARRO B., CILLO F.& Di SERIO F. (2010)
Synergistic interaction between Potato spindle tuber viroid and Cucumber mosaic virus in tomato
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Potato spindle tuber viroid (PSTVd), a nuclear replicating viroid included in the EPPO A2 list of quarantine pests, causes severe diseases to potato and tomato. In the last few years, this viroid has been detected in several symptomless ornamental solanaceous species in many European countries, producing a general alert on the risk of possible PSTVd outbreaks in horticultural crops. The recent report of symptomatic tomato plants infected by PSTVd in Italy has increased such concerns. Since tomato is also a natural host of Cucumber mosaic virus (CMV), its response to mixed infections by this virus and PSTVd was investigated. Here, we report the synergistic interaction of contemporary infections by a mild strain of PSTVd and the Fny strain of CMV in tomato cvs. Micro-Tom and UC82. Plants infected by both pathogens showed severe stunting, delay of flowering, and frequent systemic necrotic lesions that completely impaired plant growth. These symptoms were never observed in PSTVd and CMV single-infected plants, which only showed slight stunting and leaf deformation, respectively. Data about the accumulation levels of each pathogen in single- and mix-infected hosts will be discussed in the context of a possible role of RNA silencing in the synergistic interaction. These findings highlight the need of implementing control measures to restrain PSTVd spread in Europe. (literal)

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