Summary
Mobile aluminium has been found to be present in fly-ash deposits at high pH values. The problem of how plants can absorb aluminium from the anionic form is discussed, and it is suggested that organic acids produced by the plants may act as chelating agents which prevent precipitation of aluminium at physiological pH values. This hypothesis is used as the basis for an explanation of the different responses shown by various ecological groups of plants to excess aluminium.
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Jones, L.H. Aluminium uptake and toxicity in plants. Plant Soil 13, 297–310 (1960). https://doi.org/10.1007/BF01394642
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DOI: https://doi.org/10.1007/BF01394642