Abstract
The importance of vesicular-arbuscular (VA) mycorrhizas as one of a number of plant strategies ensuring effective absorption of phosphate (P) from soil is now widely recognised, but few practical efforts to ensure that their potential is realised in sustainable agricultural production have been made. On the contrary, high use of fertilizers, coupled with plant breeding approaches which have largely ignored mechanisms of nutrient efficiency (including mycorrhizas) have resulted in plant varieties which depend on the maintenance of high soil nutrient status for adequate productivity. There is an increasing awareness that high applications of P fertilizers should not continue unchecked, for several reasons. The finite reserves of rock phosphate need to be used efficiently and high P applications result in wasteful losses through the soil profile. This movement can lead to excessive growth of (sometimes-toxic) algae in rivers and reservoirs and to reduced water quality. High P application also often leads to low colonization of roots by VA mycorrhizal fungi, with consequent reductions in their contribution to nutrient absorption in field situations as well as in plant breeding programs (Smith, Robson and Abbott, 1992).
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Smith, S.E. et al. (1999). Mycorrhizal Involvement in Plant Mineral Nutrition: A Molecular and Cell Biology Perspective. In: Gissel-Nielsen, G., Jensen, A. (eds) Plant Nutrition — Molecular Biology and Genetics. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-2685-6_33
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DOI: https://doi.org/10.1007/978-94-017-2685-6_33
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