Alternaria alternata causing black spot of peach produces a host-specific toxin

Kazuoki Iwamoto, Shun Takamatsu, Mikihiro Yamamoto

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Here we report a new host-specific toxin that is produced by Alternaria alternata and is the eight reported for the fungus. The causal pathogen of black spot of peach produced a toxin in culture filtrates and in spore germination fluids. Toxin productivity during spore germination was closely related to pathogenicity of the pathogen. The degree of sensitivity of host plants to the toxin was consistent with that of susceptibility to the pathogen. Further, the toxin enabled infection by conidia of saprophytic A. alternata in peach leaves. Several cultivars showed resistance to the toxin and the pathogen, although no cultivars had an immune response. The toxin fit the criteria of a host-specific toxin and was designated AP-toxin.

Original languageEnglish
Pages (from-to)395-400
Number of pages6
JournalJournal of General Plant Pathology
Issue number5
Publication statusPublished - Sept 1 2019


  • AP-toxin
  • Alternaria alternata
  • Black spot of peach

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Plant Science


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