, Volume 159, Issue 4, pp 591–599 | Cite as

Plasmid distribution in European Diaporthe helianthi isolates

  • Mariarosaria Vergara
  • Tiziana Capasso
  • Emanuela Gobbi
  • Giovanni Vannacci


Diaporthe helianthi is the causal agent of sunflower stem canker, a serious pathogen of sunflower in Europe, which has been sporadically recorded in Italy. A collection of 26 Diaporthe helianthi isolates deriving from different geographic origins was analysed in order to determine the presence of extra-chromosomal genetic determinants and their molecular diversity. Extra-chromosomal bands in total genomic DNAs were identified in every French and the Yugoslavian isolate and in only one Italian isolate, while no Romanian and Argentinean isolates resulted to host any plasmids. When tested for their chemicophysical nature, they were recognised as linear plasmids sized about 2.3 Kb. A more detailed analysis was performed on a plasmid purified from a French isolate (plasmid F). Its intracellular localisation resulted as mitochondrial. Plasmid F was also exploited as a probe in Southern hybridisation experiments, in which it recognised only plasmids present in the genomes of French and Yugoslavian isolates (countries were the disease has a heavy incidence) indicating a strong correlation to geographic origin. An RFLP hybridisation analysis performed on genomic DNAs revealed a homogeneous restriction pattern in all French and Yugoslavian isolates, suggesting molecular homology among plasmids present in those isolates.

Key words

diaporthe helianthi geographic origin genetic variability plasmids 


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Copyright information

© Springer 2005

Authors and Affiliations

  • Mariarosaria Vergara
    • 1
    • 2
  • Tiziana Capasso
    • 1
  • Emanuela Gobbi
    • 3
  • Giovanni Vannacci
    • 1
  1. 1.Dipartimento di Coltivazione e Difesa delle Specie Legnose “G. Scaramuzzi” Sez. Patologia VegetaleItaly
  2. 2.Scuola Normale Superiore di PisaPisaItaly
  3. 3.Dipartimento di Biologia Applicata alla Difesa delle PianteUniversità di UdineUdineItaly

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