title: The phytopathogenic fungus Alternaria brassicicola: phytotoxin production and phytoalexin elicitation.
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.
authors.affiliation: Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, SK, Canada S7N 5C9. s.pedras@usask.ca
authors.forename: M Soledade C
authors.initials: MS
authors.lastname: Pedras
authors.forename: Paulos B
authors.initials: PB
authors.lastname: Chumala
authors.forename: Wei
authors.initials: W
authors.lastname: Jin
authors.forename: Mohammed S
authors.initials: MS
authors.lastname: Islam
authors.forename: Dominic W
authors.initials: DW
authors.lastname: Hauck
mesh_terms: D000528:Alternaria / Q000187:drug effects / Q000378:metabolism* / Q000472:pathogenicity*; D000935:Antifungal Agents / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology; D029688:Brassica napus / Q000378:metabolism / Q000382:microbiology; D004224:Diterpenes / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology; D018506:Gene Expression Regulation, Plant / Q000502:physiology*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D009149:Mustard Plant / Q000378:metabolism / Q000382:microbiology; D018515:Plant Leaves / Q000187:drug effects / Q000378:metabolism / Q000382:microbiology; D012717:Sesquiterpenes; D013141:Spiro Compounds / Q000737:chemistry / Q000378:metabolism*; D013729:Terpenes / Q000737:chemistry / Q000378:metabolism* / Q000494:pharmacology; D013844:Thiazoles / Q000737:chemistry / Q000378:metabolism*; D000094162:Phytoalexins
chemical_list: D000935:Antifungal Agents; D004224:Diterpenes; D012717:Sesquiterpenes; D013141:Spiro Compounds; D013729:Terpenes; D013844:Thiazoles; C417935:spirobrassinin; D000094162:Phytoalexins