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In vitro inhibition of soredial growth in the epiphytic lichen Physcia tenella (Ascomycetes: Lecanorales) by a variety of bark phenols

Published online by Cambridge University Press:  14 December 2007

Ricarda KOOPMANN ,
Henning STEVENS ,
Isabelle FRANZEN-REUTER ,
Jan-Peter FRAHM  and
Manfred GROTE
Ricarda KOOPMANN
Affiliation:
Nees Institute for Biodiversity of Plants, University of Bonn, Meckenheimer Allee 170, D-53115 Bonn, Germany. Email: frahm@uni-bonn.de
Henning STEVENS
Affiliation:
Department of Natural Science, University of Paderborn, Warburger Strasse 100, D-33098 Paderborn, Germany
Isabelle FRANZEN-REUTER
Affiliation:
Nees Institute for Biodiversity of Plants, University of Bonn, Meckenheimer Allee 170, D-53115 Bonn, Germany. Email: frahm@uni-bonn.de
Jan-Peter FRAHM
Affiliation:
Nees Institute for Biodiversity of Plants, University of Bonn, Meckenheimer Allee 170, D-53115 Bonn, Germany. Email: frahm@uni-bonn.de
Manfred GROTE
Affiliation:
Department of Natural Science, University of Paderborn, Warburger Strasse 100, D-33098 Paderborn, Germany
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Abstract:

The in-vitro growth rate of soredia from the epiphytic lichen species Physcia tenella was tested at different concentrations of phenols added in an in vitro experiment designed to evaluate the allelopathic effects of bark derived substances in stem flow. The conditions used were designed to resemble those found on bark of Populus×canadensis, as this tree species has been widely used for lichen mapping studies in Germany. Bark phenolic glycosides, flavonoids and tannins undergo hydrolytic decomposition in stem flow, resulting in a variety of monomeric phenolic acids, aldehydes and alcohols. Eleven phenolic substances of different biosynthetic origin in the concentration range between 10−6 M and 10−3 M in the culture medium were tested. IC50 values were calculated for each substance. Inhibition was highest for catechol, substituted phenolic glycosides, benzoic and ellagic acids, moderate for flavonoids, gallic acid, salicylic alcohol, salicylic aldehyde and low for salicylic acid. The tests show that bark phenols in natural concentrations inhibit soredial growth of the test species Physcia tenella and therefore have an influence on the growth of lichens on trees.

Keywords

in vitro testsalicylatessoredia
Type
Research Article
Information
The Lichenologist , Volume 39 , Issue 6 , November 2007 , pp. 567 - 572
Copyright
Copyright © British Lichen Society 2007

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