Record ID No. |
338 |
Author(s) |
Arvieu J. C., Leprince F., Plassard C. , 2003 |
Affiliation |
Institute National de la recherche agronomique (INRA), EMSAM Rhizosphere and Symbiose, UMR 1222, 2 Pl Pierre Viala, F-34060 Montpellier 1, France |
Title |
Release of oxalate and protons by ectomycorrhizal fungi in response to P-deficiency and calcium carbonate in nutrient solution |
Source. Vol.(no):Page |
Annals of Forest Science. 60(8): 815-821p. |
Categories |
Ectomycorrhiza |
Subjects |
Biochemistry |
Sub-subjects |
|
Host |
EcM |
Organism |
Rhizopogon roseolus, R. roseolus, Suillus collinitus, Paxillus involutus, Hebeloma cylindrosporum |
Country |
France, Europe |
Abstracts |
The release of oxalate and H+ by six ectomycorrhizal isolates (Hebeloma cylindrosporum 1 and 9, Paxillus involutus, Suillus collinitus 2 and 22, Rhizopogon roseolus), able to grow in vitro with NO3- as the sole source of N, was measured in response to orthophosphate (Pi) concentration (20, 100 and 500 muM Pi) and CaCO3 (+500 muM Pi) in the solution. Without CaCO3, all isolates excepted H. cylindrosporum ones released oxalate. For each isolate, oxalate production was not related to P-deficiency but was strongly enhanced by CaCO3. Whatever the medium composition, H. cylindrosporum alkalinised the solution. Among oxalate-producing fungi, S. collinitus 22 and R. roseolus exhibited an important proton efflux that could be related to transport phenomena for oxalate excretion. CaCO3 enhanced both oxalate and proton efflux, increasing the chemical action exerted by the fungi on the mineral |