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Quantification and bioavailability of scyllo-inositol hexakisphosphate in pasture soils |
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| Authors: | Benjamin L. Turner Nathalie Mahieu C.R. Chen |
| Affiliation: | a Smithsonian Tropical Research Institute, Apartado 0843-03092, Balboa, Ancón, Panama, Republic of Panama b Department of Chemistry, Queen Mary, University of London, London E1 4NS, UK c Agriculture and Life Sciences, P.O. Box 84, Lincoln University, Canterbury 8150, New Zealand d Centre for Forestry and Horticultural Research, Faculty of Environmental Sciences, Griffith University, Nathan, Qld 4111, Australia |
| Abstract: | The recent identification of scyllo-inositol hexakisphosphate in alkaline soil extracts by solution 31P NMR spectroscopy allowed us to investigate this compound in soils by re-analyzing spectra from two previously published studies. Concentrations of scyllo-inositol hexakisphosphate in 29 temperate pasture soils from England and Wales ranged between 11 and 130 mg P kg−1 soil and accounted for between 4 and 15% of the soil organic phosphorus. The ratio of scyllo-inositol hexakisphosphate to myo-inositol hexakisphosphate ranged between 0.29 and 0.79. In a 10 month pot experiment with six grassland soils from New Zealand, growth of pine seedlings (Pinus radiata D. Don) decreased scyllo-inositol hexakisphosphate concentrations by between 10 and 46%. Growth of ryegrass (Lolium perenne L.) decreased scyllo-inositol hexakisphosphate in three low-nutrient soils by 5-21%, but increased it in three other soils by 11-16%. We conclude that scyllo-inositol hexakisphosphate is an important component of soil organic phosphorus with potential ecological significance. |
| Keywords: | Pasture soil Inositol phosphate myo-Inositol hexakisphosphate scyllo-inositol hexakisphosphate Phytic acid Solution 31P NMR spectroscopy |
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