Localization of melanin in appressoria of Colletotrichum lagenarium

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Abstract
The location of melanin in appressoria of Colletotrichum lagenarium was determined by ultrastructural comparison of the parent strain 104-T, an albino mutant 79215, and an albino mutant 79215 treated with scytalone, a melanin precursor in this fungus. Melanin in appressoria of the parent strain 104-T and that of albino mutant 79215 treated with scytalone was located external to the plasmalemma as a smooth, thin, electron-dense layer. A comparable layer was not observed in appressoria of the albino mutant 79215 without scytalone. Electron microscopic observation of a median section of pigmented appressoria of albino mutant 79215 treated with scytalone indicated that the melanized layer extended over the appressoria with the exception of the pore which provides an opening for the emergence of the infection peg.