Abstract
Oxalate accumulation in external medium under hyphal mats of two ectomycorrhizal species is strongly stimulated (1.7 to 35 fold) by a simultaneous depletion of available K+ and Mg2+. Pisolithus tinctorius strain 441 accumulates oxalate both on NH4−N and on NO3−N whereas Paxillus involutus strain COU only accumulates oxalate on NO3−N. On NO3−N, under a simultaneous K+ and Mg2+ deficiency, P. involutus COU is a very active oxalate producer compared to P. tinctorius 441. The present results could explain the various mineralogical evolutions of a phlogopite mica previously recorded under P. involutus COU or P. tinctorius 441 and suggest a key role for fungal oxalic acid during mineral weathering in response to nutrient deficiency.
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Paris, F., Botton, B. & Lapeyrie, F. In vitro weathering of phlogopite by ectomycorrhizal fungi. Plant Soil 179, 141–150 (1996). https://doi.org/10.1007/BF00011651
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DOI: https://doi.org/10.1007/BF00011651