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European Journal of Plant Pathology

, Volume 149, Issue 2, pp 401–413 | Cite as

Identification and characterization of Alternaria species causing leaf spot on cabbage, cauliflower, wild and cultivated rocket by using molecular and morphological features and mycotoxin production

  • Ilenia Siciliano
  • Giovanna Gilardi
  • Giuseppe Ortu
  • Ulrich Gisi
  • Maria Lodovica Gullino
  • Angelo Garibaldi
Article

Abstract

Alternaria species are common pathogens of fruit and vegetables able to produce secondary metabolites potentially affecting human health. Twenty-nine isolates obtained from cabbage, cauliflower, wild and cultivated rocket were characterized and identified based on sporulation pattern and virulence; the phylogenetic analysis was based on the β-tubulin gene. Isolates were identified as A. alternata, A. tenuissima, A. arborescens, A. brassicicola and A. japonica. Pathogenicity was evaluated on plants under greenhouse conditions. Two isolates showed low level of virulence on cultivated rocket while the other isolates showed medium or high level of virulence. Isolates were also characterized for their mycotoxin production on a modified Czapek-Dox medium. Production of the five Alternaria toxins, tenuazonic acid, alternariol, alternariol monomethyl ether, altenuene and tentoxin were evaluated. Under these conditions, about 80% of the isolates showed the ability to produce at least one mycotoxin.

Keywords

Crucifers Toxins Leaf spot Tenuazonic acid 

Notes

Acknowledgements

Work supported by the European Community’s Seventh Framework Programme (FP7/2007-2013) under grant agreement n. 261752, PLANTFOODSEC “Plant and Food Biosecurity, Network of Excellence”.

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Copyright information

© Koninklijke Nederlandse Planteziektenkundige Vereniging 2017

Authors and Affiliations

  • Ilenia Siciliano
    • 1
  • Giovanna Gilardi
    • 1
  • Giuseppe Ortu
    • 1
  • Ulrich Gisi
    • 1
  • Maria Lodovica Gullino
    • 1
    • 2
  • Angelo Garibaldi
    • 1
  1. 1.Agroinnova – Centre of Competence for the Innovation in the Agro-Environmental SectorUniversity of TurinTurinItaly
  2. 2.DISAFA - Dipartimento di Scienze Agrarie, Forestali e AlimentariUniversity of TurinTurinItaly

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