Structural Studies on the Phytotoxins Produced by a Pathotype of Alternaria Citri Causing a Brown Spot Disease of Mandarins

  • Y. Kono
  • J. M. Gardner
  • Y. Suzuki
  • S. Takeuchi
Conference paper
Part of the NATO ASI Series book series (volume 27)

Abstract

The structures of eight components of the host-selective ACTG-toxin from strains of Alternaria citri, causing a brown spot disease of Dancy tangerine and other mandarin species, were identified by analyses of the MS and NMR spectra of the native toxins and their acetates (ACTG-toxins G & H, Figure 1). Two other novel compounds were simultaneously produced: dihydrosporogen AO-1 with an eremo-philane type sesquiterpene structure (Figure 1) and nonselective dihydrotentoxin with a L-phenylalanine moiety instead of the dehydro-alanine of tentoxin. Tentoxin and tenuazonic acid were present in the same cultures.

Keywords

Alanine Sesquiterpene Dehydro Tentoxin 

Copyright information

© Springer-Verlag Berlin Heidelberg 1989

Authors and Affiliations

  • Y. Kono
    • 1
  • J. M. Gardner
    • 2
  • Y. Suzuki
    • 1
  • S. Takeuchi
    • 1
  1. 1.The Institute of Physical and Chemical ResearchWako-shi, SaitamaJapan
  2. 2.The Citrus Research and Education CenterUniversity of FloridaLake AlfredUSA

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