Ultrastructural and chemical distinction of melanins formed by Verticillium dahliae from (+)-scytalone, 1,8-dihydroxynaphthalene, catechol, and L-3,4-dihydroxyphenylalanine

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Abstract
Microsclerotia of three melanin-deficient mutants of Verticillium dahliae formed melanin from (+)-scytalone, 1,8-dihydroxynaphthalene, catechol, and L-3.4-dihydroxyphenylalanine. The melanins formed from (+)-scytalone or 1,8-dihydroxynaphthalene resembled wild-type melanin chemically and ultrastructurally, whereas the melanins formed from catechol and L-3,4-dihydroxyphenylalanine were different. This suggests that scytalone and 1,8-dihydroxynaphthalene but not catechol or L-3,4-dihydroxyphenylalanine are natural intermediates of melanin biosynthesis in V. dahliae.