Mycorrhiza

, Volume 3, Issue 2, pp 69–73

Determination of mannitol in ectomycorrhizal fungi and ectomycorrhizas by enzymatic micro-assays

  • Astrid Wingler
  • Martin Guttenberger
  • Rüdiger Hampp
Original Papers

Abstract

Two sensitive methods for the enzymatic determination of mannitol are described which were applied to fungal and mycorrhizal extracts. Both methods are based on the oxidation of mannitol by mannitol dehydrogenase from Agaricus hortensis and the fluorometric determination of the NADPH produced in this reaction. The detection limits are 125 pmol for the direct fluorometric assay and 100 fmol, when enzymatic cycling of NADPH is included. The levels of mannitol detected were 123 pmol/μg dry wt (mycelia from Cenococcum geophilum, cultivated on malt medium), below 0.3 or about 2.4 pmol/μg dry wt (mycelia from Amanita muscaria, dependent on carbon source in the cultivation medium), and between 1.9 and 5.2 pmol/μg dry wt in mycorrhizal short roots of Picea abies/Amanita muscaria.

Key words

Amanita Cenococcum Enzymatic cycling Mannitol determination Mycorrhiza 

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Copyright information

© Springer-Verlag 1993

Authors and Affiliations

  • Astrid Wingler
    • 1
  • Martin Guttenberger
    • 1
  • Rüdiger Hampp
    • 1
  1. 1.Physiologische Ökologie der Pflanzen, Universität TübingenTübingenGermany

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