Present address: Department of Botany, University of Alberta, Edmonton, Alberta T6G 2E9, Canada; to whom correspondence should be addressed.
Utilization of AlPO4 as a phosphorus source by ectomycorrhizal Pinus rigida Mill. seedlings
Article first published online: 28 APR 2006
Volume 116, Issue 1, pages 99–106, September 1990
How to Cite
CUMMING, J. R. and WEINSTEIN, L. H. (1990), Utilization of AlPO4 as a phosphorus source by ectomycorrhizal Pinus rigida Mill. seedlings. New Phytologist, 116: 99–106. doi: 10.1111/j.1469-8137.1990.tb00514.x
- Issue published online: 28 APR 2006
- Article first published online: 28 APR 2006
- (Received 15 November 1989; accepted 2 April 1990)
- Pinus rigida;
- Pisolithus tinctorius
Mycorrhizal infection of roots of Pinus rigida Mill, seedlings by Pisolithus tinctorius Coker & Couch maintained normal foliar P relations when seedlings were exposed to Al in solution. To investigate how this symbiosis aids in P acquisition in the presence of Al, seedlings were grown in sand culture with solutions containing between 1 and 50 μM NaH2PO4 (Pi) with or without insoluble AlPO4 in the substrate. Mycorrhizal seedlings had a higher affinity for Pi than non-mycorrhizal seedlings as judged by superior growth and foliar P contents at all Pi levels tested. In addition, mycorrhizal seedlings, but not nonmycorrhizal seedlings, effectively extracted P from AlPO4 through the dissolution of this insoluble salt. Measurement of matrix solution pH indicated that increased proton production, in association with high proliferation of mycorrhizal roots under P-limiting conditions, led to increased AlPO4 solubilization.