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Structure elucidation of AK-toxins, host-specific phytotoxic metabolites produced by alternaria kikuchiana tanaka

✍ Scribed by Tadakazu Nakashima; Tamio Ueno; Hiroshi Fukami

Publisher: Elsevier Science
Year: 1982
Tongue: French
Weight: 284 KB
Volume: 23
Category: Article
ISSN: 0040-4039
DOI: 10.1016/s0040-4039(00)85630-0

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✦ Synopsis

The structures of two host-specific phytotoxic metabolites, AK-toxin I and II, isolated from culture broth of AZtemaria kikuchiam Tanaka (the fungus causing black spot disease of Japanese pear) were determined to be the ester consisting of N-acetyl-fi-methylphenylalanine and 9,lO-epoxy-8-hydroxy-9-methyl-ZE,42,6E-decatrienoic acid (I) and its B-demethyl derivative (2).

At present, "host-specificity" of plant pathogens is the most intriguing problem in plant pathology 1) . Host-specific toxins were demonstrated to be the primary determinants for host recognition in several diseases caused by ALtemaria species 2-5

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Structure of AF-toxin II, one of the hos

Structure of AF-toxin II, one of the host-specific toxins produced by alternaria alternata strawberry pathotype

✍ Shin-ichi Nakatsuka; Kazuo Ueda; Toshio Goto; Mikihiro Yamamoto; Syoyo Nishimura 📂 Article 📅 1986 🏛 Elsevier Science 🌐 French ⚖ 220 KB

AF-toxin II was a mixture of three stereo-isomers , whose structures were determined as 2, 2,b and 2,~ by means of chemical and spectroscopic methods. Host specificity of plant pathogens is a most intriguing problem in the field of plant patholog :! A distinct pathotype of Alternaria alternata (Frie