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

Kazuoki Iwamoto, Shun Takamatsu, Mikihiro Yamamoto

Research output: Contribution to journalArticle

Abstract

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
JournalJournal of General Plant Pathology
DOIs
Publication statusPublished - Jan 1 2019

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Alternaria alternata
peaches
toxins
pathogens
spore germination
culture filtrates
cultivars
conidia
pathogenicity
host plants
immune response
fungi

Keywords

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

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Plant Science

Cite this

Alternaria alternata causing black spot of peach produces a host-specific toxin. / Iwamoto, Kazuoki; Takamatsu, Shun; Yamamoto, Mikihiro.

In: Journal of General Plant Pathology, 01.01.2019.

Research output: Contribution to journalArticle

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AB - 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.

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