Abstract
Red clover (Trifolium pratense L.) and Glomus versiforme (Karsten) Berch growing in rhizoboxes were employed in two glasshouse experiments to study the mobilization of sparingly soluble phosphates by arbuscular mycorrhizal fungal (AMF) mycelium. In one experiment, four inorganic sources of phosphate, CaHPO4.2H2O (Ca2-P), Ca8H2(PO4)6.5H2O (Ca8-P), Ca10(PO4)6.F2 (Ca10-P) and AlPO4.nH2O (Al-P), were chemically synthesized, labelled with 32P in an atomic pile and applied to the hyphal compartments of the rhizoboxes. Shoot yield, 32P and total P uptake were measured in clover growing in the root compartments. A similar experiment was conducted simultaneously using the same phosphate sources unlabelled and clover mycorrhizal infection and soil pH were determined. Although AMF inoculation increased the P uptake and biomass of clover shoots, the contribution of AMF to shoot P uptake and biomass varied with phosphate source, and was greatest with Ca2-P and least with Ca10-P. 32P measurements indicated that external hyphae could mobilize Ca2-P, Ca8-P and Al-P, but not Ca10-P. This indicates that AMF not only mobilize the same types of phosphates that plants mobilize under stress conditions of low P, but give increased contact with phosphates in the soil compared with non-mycorrhizal root systems.
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Yao, Q., Li, X., Feng, G. et al. Mobilization of sparingly soluble inorganic phosphates by the external mycelium of an abuscular mycorrhizal fungus. Plant and Soil 230, 279–285 (2001). https://doi.org/10.1023/A:1010367501363
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DOI: https://doi.org/10.1023/A:1010367501363