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The influence of ecotrophic mycorrhizal fungi on the resistance of Pine roots to pathogenic infections. II. Productions, identification, and biological activity of antibiotics produced by Leucopaxillus cerealis var. piceina



The influence of ecotrophic mycorrhizal fungi on the resistance of Pine roots to pathogenic infections. II. Productions, identification, and biological activity of antibiotics produced by Leucopaxillus cerealis var. piceina



Phypathology. 59: 4, 411-7



The most active component of the antibiotic substances produced by pure cultures of L. cerealis var. piceina was isolated and identified as diatretyne nitrile (DN), a polyacetylene of low molecular weight. With increasing age of the culture, DN became largely reduced to diatretyne amide and diatretyne 3, which are antibacterial but not antifungal substances. DN is a known antibacterial and antifungal metabolite of certain hymenomycetes. Growth of the cultures and DN production were greatly stimulated by adding a 10% extract of the roots of Pinus echinata. The presence of sucrose or malt extract was essential for DN production. The inhibition of mycelial disks and zoospores of Phytophthora cinnamomi by various concentrations of DN was investigated. Germination of zoospores was totally inhibited at.2 p.p.m. and growth of disks ceased at 9 p.p.m. Concentrations 10 p.p.m. were phytotoxic to P. echinata seedlings, but exposure of Pine seeds to 40 p.p.m. did not inhibit subsequent germination. Concentrations 10 p.p.m. are only rarely present in cultures.

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Accession: 014749514

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PMID: 5811914



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