In vitro weathering of phlogopite by ectomycorrhizal fungi .2. Effect of K+ and Mg2+ deficiency and N sources on accumulation of oxalate and H+ Journal Article uri icon

DCO ID 11121/9030-8485-7354-8562-CC

in language

  • eng

year of publication

  • 1996


  • 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 Paxillux 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.


  • 179


  • 1