In dual cultures Oudemansiella mucida and Xerula melanotricha (basidiomycetes) react to the presence of living Penicillium notatum or P. turbatum with an increased production of strobilurin A (1) or X (2). P. notatum in turn reacts to the two basidiomycetes or their antibiotic strobilurin A alone with the production of N-(2-hydroxypropanoyl)-2-aminobenzoic acid amide (3) or chrysogine (4). P. melinii and P. urticae overgrow O. mucida due to complete resistance to strobilurin A. P. brevicompactum, P. citrinum, P. janczewskii and the other Penicillium strains are all sensitive but apparently do not induce O. mucida to produce the amounts of strobilurin A needed to inhibit their growth.
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Kettering et al. (2004) studied this question.