The phytopathogenic fungus Alternaria brassicicola: Phytotoxin production and phytoalexin elicitation |
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Authors: | M. Soledade C. Pedras Paulos B. Chumala Wei Jin Mohammed S. Islam Dominic W. Hauck |
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Affiliation: | Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, SK, Canada S7N 5C9 |
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Abstract: | The metabolites and phytotoxins produced by the phytopathogenic fungus Alternaria brassicicola (Schwein.) Wiltshire, as well as the phytoalexins induced in host plants, were investigated. Brassicicolin A emerged as the most selective phytotoxic metabolite produced in liquid cultures of A. brassicicola and spirobrassinin as the major phytoalexin produced in infected leaves of Brassica juncea (whole plants). In detached infected leaves of B. juncea, the main component was N′-acetyl-3-indolylmethanamine, the product of detoxification of the phytoalexin brassinin by A. brassicicola. In addition, the structure elucidation of three hitherto unknown metabolites having a fusicoccane skeleton was carried out and the antifungal activity of several plant defenses against A. brassicicola was determined. |
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Keywords: | Alternaria brassicicola Brown mustard Brassica juncea Canola Brassica napus White mustard Sinapis alba Brassicaceae Brassicicolin A Brassicicene Brassinin Cyclobrassinin Destruxin Fusicoccane Host-selective Phytoalexin Phytotoxin Spirobrassinin |
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