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Localization of Polyphenoloxidases During the Establishment of Ophrys lutea Endomycorrhizas

M. Salome S. Pais and J. Barroso
The New Phytologist
Vol. 95, No. 2 (Oct., 1983), pp. 219-222
Published by: Wiley on behalf of the New Phytologist Trust
Stable URL: http://www.jstor.org/stable/2432693
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Localization of Polyphenoloxidases During the Establishment of Ophrys lutea Endomycorrhizas
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Abstract

The cytochemical location of polyphenoloxidases in Ophrys lutea during invasion by Rhizoctonia repens suggests that the fungus is able to synthesize or activate polyphenoloxidases. The dense product of its reaction is observable in the fungal cytoplasm during the first stages of fungal invasion. Later on, it is located in small quantities in the hyphal cytoplasm and great amounts are seen at the interface. Our results suggest that the enzymes, synthesized in the fungal cytoplasm, are translocated across the plasmalemma and the cell wall of the fungus. These enzymes are accumulated in the interface close to the host plasmalemma, where they are likely to promote the oxidation of phenols from the host.

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