01502naa a2200193 a 450000100080000000500110000800800410001910000190006024501190007926000090019852009330020765000170114065000250115765000130118265000140119565000260120970000210123577300520125612795062025-01-16       1990    bl uuuu     u00u1 u    #d1 aCUMMING, J. R.  aUtilization of AlPO4 as a phosphorus source by ectomycorrhizal Pinus rigida Mill seedlings.h[electronic resource]  c1990  aMycorrhizal 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.  aPinus rigida  aFosfato de Alumínio  aFósforo  aMicorriza  aPisolithus Tinctorius1 aWEINSTEIN, L. H.  tNew Phytologistgv. 116, n. 1, p. 99-106, 1990.