Conclusions
Mycorrhizal fungi increase the rate of phosphate uptake by roots (P inflow) over a range of soil P levels even when mycorrhizal growth increases no longer occur. It is likely that the fungi play a direct part in uptake and translocation of P to the roots. V.A.M. effects on nodulation and N2 fixation are largely indirect, probably resulting from improved P nutrition and growth at low soil P levels. Work on inorganic cation nutrition is much less advanced, but it is already clear that there are interactions between P nutrition and cation uptake which may also be indirect. The pattern of N assimilation (N2 fixation vis-à-vis NaNO3 or (NH4)2SO4 uptake) may modify cation/P interactions. Further work is required to distinguish cause and effect and to clarify the role played by V.A.M. fungi.
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Smith, S.E., Smith, F.A. & Nicholas, D.J.D. Effects of endomycorrhizal infection on phosphate and cation uptake byTrifolium subterraneum . Plant Soil 63, 57–64 (1981). https://doi.org/10.1007/BF02374257
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DOI: https://doi.org/10.1007/BF02374257