Abstract
Stagonosporopsis andigena and S. crystalliniformis are serious foliage pathogens on potato (Solanum tuberosum) and tomato (Solanum lycopersicum). As both species have been recorded only in the Andes area, S. andigena is listed as an A1 quarantine organism in Europe. The actin region of isolates of Stagonosporopsis and allied species of Boeremia, Didymella, Peyronellaea and Phoma was amplified using generic primers. DNA sequence differences of the actin gene were utilised to develop species-specific real-time (TaqMan) PCR assays for the detection of S. andigena and S. crystalliniformis in leaves of potato or tomato. The specificity of the TaqMan PCR assays was determined on genomic DNA extracted from two S. andigena and two S. crystalliniformis isolates and 16 selected isolates of Stagonosporopsis, Phoma and Boeremia, which are the closest relatives. The validation of the methods developed included the DNA extraction and the TaqMan PCR assays. The performance criteria specificity, analytical sensitivity, reproducibility, repeatability and robustness of the TaqMan PCR assays demonstrated the reliability of both methods for the detection of S. andigena and S. crystalliniformis in leaf material. The TaqMan PCR assays were tested on symptomatic leaves of potato and tomato that were obtained after artificial inoculation of detached leaves with both pathogens under quarantine conditions. In the artificial inoculation experiments both S. andigena and S. crystalliniformis caused leaf infections on potato and tomato.
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The Dutch Ministry of Economics, Innovation and Agriculture has supported this research through an endowment of the FES program ‘Reinforcement Infrastructure Plant Health’.
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de Gruyter, J., van Gent-Pelzer, M.P.E., Woudenberg, J.H.C. et al. The development of a validated real-time (TaqMan) PCR for detection of Stagonosporopsis andigena and S. crystalliniformis in infected leaves of potato and tomato. Eur J Plant Pathol 134, 301–313 (2012). https://doi.org/10.1007/s10658-012-9990-8
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DOI: https://doi.org/10.1007/s10658-012-9990-8