Abstract
Phosphorus (P) is a major limiting nutrient for plants in boreal forest ecosystems where a substantial part of the total P is sequestered in organic compounds. Some ectomycorrhizal (ECM) fungi are known to produce phosphomonoesterases, enzymes that degrade organic P sources. Here, we test 16 ECM species for this enzymatic activity by growing them on media containing orthophosphate, phytic acid or apatite. A method with an overlay gel that determined both phosphomonoesterase activity and its spatial distribution was developed. The phosphomonoesterase activity was not significantly higher when growing on organic P; conversely some isolates only produced measurable enzyme activity when grown on apatite. Species-specific variations with respect to phosphomonoesterase activity as well as growth responses to different substrates were found. The production of phosphomonoesterases was found to be widespread in ECM fungi and the enzyme activity did not need induction by organic P. The enzyme activity was highest in the central parts of the mycelia, potentially reflecting breakdown and recycling of phospholipids from old hyphae or potentially higher mycelial density.
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Acknowledgements
The authors would like to thank David Rönnlund for the help extended in the laboratory. Andy Taylor and Björn Lindahl are gratefully acknowledged for helpful comments on the manuscript. This work was financially supported by the Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning (FORMAS-2006-267 and 2005-1504).
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Nygren, C.M.R., Rosling, A. Localisation of phosphomonoesterase activity in ectomycorrhizal fungi grown on different phosphorus sources. Mycorrhiza 19, 197–204 (2009). https://doi.org/10.1007/s00572-008-0223-0
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DOI: https://doi.org/10.1007/s00572-008-0223-0