Melanin in the extracellular matrix of germlings of Botrytis cinerea |
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| Authors: | Doss Robert P Deisenhofer Joachim Krug von Nidda Hans Albrecht Soeldner Alfred H McGuire Ruth P |
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| Affiliation: | a USDA-ARS, Horticultural Crops Research Unit, 3420 NW Orchard Avenue, Corvallis, OR 97330, USAb Department of Horticulture, Oregon State University, Corvallis, OR 97331, USAc Experimentalphysik V, EKM, Institut fuer Physik, Universitaet Augsburg, D-86159 Augsburg, Germanyd Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR 97331, USA |
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| Abstract: | Previous work on the composition of the extracellular matrix of germlings of the plant pathogenic fungus Botrytis cinerea demonstrated the presence of carbohydrate, protein, and simple lipids; which, together, comprised 50-60% of the dry weight. Here we show that most of the remaining mass of the extracellular matrix consists of a chemically inert dark pigment with the electron paramagnetic resonance characteristics of a melanin. Scanning electron micrographs of the purified pigment, and transmission electron micrographs of thin sections made using the pigment indicate that it has a filamentous structure. We conclude that melanin is an important component of the extracellular matrix of germlings of B. cinerea. This is the first report of a melanin present in the extracellular matrix of a plant pathogenic fungus. |
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| Keywords: | Botrytis cinerea Sclerotiniaceae Grey mold Extracellular matrix Composition Melanin |
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