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

✍ Scribed by Shin-ichi Nakatsuka; Kazuo Ueda; Toshio Goto; Mikihiro Yamamoto; Syoyo Nishimura; Keisuke Kohmoto

• Publisher: Elsevier Science
• Year: 1986
• Tongue: French
• Weight: 220 KB
• Volume: 27
• Category: Article
• ISSN: 0040-4039
• DOI: 10.1016/s0040-4039(00)84635-3

✦ Synopsis

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 (Fries) Keissler, the cause of Alternaria black spot disease of strawberry, is pathogenic to only one cultivar of strawberry, Morioka-16, and to limited cultivars of Japanese pear including cultivar Nijisseiki?) This pathogen produces three host-specific toxins, AF-toxin I, II and III, in both the culture filtrates and the spore-germinated fluids with the same host-selectivity as the producing fungus. 3' 4, These toxins expressed different biological activities on the hosts as shown in Table 1. Now we report the isolation and structure determination of AF-toxin II.