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Assessment of real-time PCR as a method for determining the presence of Verticillium dahliae in different Solanaceae cultivars

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Abstract

Real-time PCR was used to detect and quantify Verticillium dahliae and to assess the susceptibility of four Capsicum annuum cultivars (Luesia, Padrón, SCM331 and PI201234) and the Capsicum chinense cv. C118 to this pathogen. The symptoms which developed after infection included stunting and yellowing, and were more acute in the cv. SCM331, which also suffered defoliation in later stages of the disease and in C118, which suffered severe stunting. Quantification of the pathogen DNA in roots 23 and 34 days post-inoculation (dpi) revealed that there were significantly higher amounts of Verticillium dahliae DNA in C118 than in the other cultivars, followed by SCM331, Padrón and PI201234. The lowest amounts of fungal DNA in roots were found in Luesia. In hypocotyls, the highest amounts of fungal DNA were found in SCM331, while Luesia, Padrón and PI201234 had much lower amounts, and C118 had intermediate levels. When a compatible versus an incompatible system was studied, using the near-isogenic tomato lines LA3030 (susceptible) and LA3038 (resistant to V. dahliae), we were able to detect fungal DNA in both lines. As expected, the fungus/plant DNA ratio was lower in LA3038 than in LA3030 and it decreased with time in LA3038. The amount of Verticillium dahliae DNA in the roots of LA3030 remained constant between days 23 and 34 post-inoculation, but increased 10-fold in collars. Finally, when real-time PCR was applied as a diagnostic method to samples from pepper plants, soil and water collected from farms in northwest Spain, we were able to detect V. dahliae DNA in these samples even when symptoms of the disease were not evident.

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Acknowledgements

This work was supported by grants from XUGA (PDIDIT0RAG10301PR) and INIA (RTA04-065-2). We are greatly indebted to Silvia Saavedra for her skilful technical work. The technical assistance of José Antonio Vilar and Fernanda Rodríguez Fariña is gratefully acknowledged. We thank Dr Ros Barceló for his critical review.

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Authors and Affiliations

  1. Departamento de Biología Animal, Biología Vegetal y Ecología, Universidad de La Coruña, 15071, La Coruna, Spain

    Carmen Gayoso & Fuencisla Merino de Cáceres

  2. Centro de Investigaciones Agrarias de Mabegondo, Xunta de Galicia, 15318, La Coruna, Spain

    Oscar Martínez de Ilárduya & Federico Pomar

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  1. Carmen Gayoso
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  2. Oscar Martínez de Ilárduya
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  3. Federico Pomar
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  4. Fuencisla Merino de Cáceres
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Correspondence to Fuencisla Merino de Cáceres.

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Gayoso, C., de Ilárduya, O.M., Pomar, F. et al. Assessment of real-time PCR as a method for determining the presence of Verticillium dahliae in different Solanaceae cultivars. Eur J Plant Pathol 118, 199–209 (2007). https://doi.org/10.1007/s10658-007-9134-8

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  • DOI: https://doi.org/10.1007/s10658-007-9134-8

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