Current Genetics

, Volume 28, Issue 5, pp 491–498 | Cite as

Phologeny of Alternaria fungi known to produce host-specific toxins on the basis of variation in internal transcribed spacers of ribosomal DNA

  • Motoaki Kusaba
  • Takashi Tsuge
Original Paper


The internal transcribed spacer regions (ITS1 and ITS2) of ribosomal DNA from Alternaria species, including seven fungi known to produce host-specific toxins, were analyzed by polymerase chain reaction-amplification and direct sequencing. Phylogenetic analysis of the sequence data by the Neighbor-joining method showed that the seven toxin-producing fungi belong to a monophyletic group together with A. alternata. In contract, A. dianthi, A. panax, A. dauci, A. bataticola, A. porri, A. sesami and A. solani, species that can be morphologically distinguished from A. alternata, could be clearly separated from A. alternata by phylogenetic analysis of the ITS variation. These results suggest that Alternaria pathogens which produce host-specific toxins are pathogenic variants within a single variable species, A. alternata.

Key words

Alternaria alternata Host-specific toxin Phylogenetic analysis Ribosomal DNA 


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Copyright information

© Springer-Verlag 1995

Authors and Affiliations

  • Motoaki Kusaba
    • 1
  • Takashi Tsuge
    • 1
  1. 1.School of Agricultural SciencesNagoya UniversityNagoyaJapan

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