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Effects of plant-derived naphthoquinones on the growth of Pleurotus sajor-caju and degradation of the compounds by fungal cultures by Nicoletta Curreli; Francesca Sollai; Laura Massa; Ornella Comandini; Anna Rufo; Enrico Sanjust; Augusto Rinaldi; Andrea C. Rinaldi is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

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The growth of the white-rot basidiomycete Pleurotus sajor-caju in malt-agar plates was inhibited by three naturally occurring, plant-derived naphthoquinones: juglone, lawsone, and plumbagin. The latter two compounds exerted the most potent antifungal activity, and lawsone killed the mycelium at concentrations higher than 200 ppm. Plates containing juglone and lawsone presented large decolorized areas extending from area of fungal growth, suggesting an extracellular enzymatic degradation of these quinones. Screening of culture plates for extracellular enzymatic activities revealed the presence of both laccase and veratryl alcohol oxidase in most plates, the diffusion of both enzymes matching the decolorized area. In agitated cultures, the presence of juglone was found to stimulate the production of veratryl alcohol oxidase in a significant manner. This is the first time degradation of plant derived naphthoquinones by a white-rot fungus is reported.

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Author

Nicoletta Curreli; Francesca Sollai; Laura Massa; Ornella Comandini; Anna Rufo; Enrico Sanjust; Augusto Rinaldi; Andrea C. Rinaldi

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Ltd.; Akademie Verlag; Wiley (ISSN 0233-111X)

Published

2001

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)