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https://hdl.handle.net/2440/27419
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Type: | Journal article |
Title: | Phytotoxicity of aluminium-fluoride complexes and their uptake from solution culture by Avena sativa and Lycopersicon esculentum |
Author: | Stevens, D. McLaughlin, M. Alston, A. |
Citation: | Plant and Soil: international journal on plant-soil relationships, 1997; 192(1):81-93 |
Publisher: | Springer Netherlands |
Issue Date: | 1997 |
ISSN: | 0032-079X 1573-5036 |
Abstract: | Avena sativa (oats) and Lycopersicon esculentum (tomatoes) were grown in dilute nutrient solutions supplemented with Al only, F only or a combination of both. In solutions containing Al and F, shoot growth was limited when predicted Al(r). (Al3+, AlOH2+ and Al(OH)2/+) activities were < 0.1 μM, activities three orders of magnitude lower than the critical value determined with Al only. The data suggest that at the activities used in these experiments, Al(r) is most toxic, AlF2+ and AlF2/+ are toxic to a lesser extent, and AlF3, AlF4/- and F- are least toxic. Fluoride concentrations in shoots grown in solutions correlated best with positively charged AlF(x)/(3-x) species (i.e. AlF2+, AlF2+) and the molar ratio of F:Al in most plants shoots was about 3:2. However, when activities of positively charged AlF(x)/(3-x) species were low (< 50 μM) and the activity of AlF3 species high (500 μM) the molar ratio of F:Al in plant shoots suggested AlF3 was taken up. These findings are discussed in relation to plant uptake and toxicity. Measured concentrations of Al(r) and F- in solutions containing Al and F were compared with concentrations predicted by a computer model (GEOCHEM-PC). The method for measuring F- concentrations, using a non-complexing buffer and F ion-selective electrode, gave good agreement with predicted F- concentrations. The 8-hydroxyquinoline method for measuring Al(r) concentrations did not agree with predicted concentrations, highlighting the limitations of this method when measuring Al(r) in the presence of F in a multi-ligand system with high concentrations of F and Al. |
Keywords: | Aluminium-fluoride complexes rootuptake solution culture |
DOI: | 10.1023/A:1004224526067 |
Published version: | http://dx.doi.org/10.1023/a:1004224526067 |
Appears in Collections: | Aurora harvest 6 Environment Institute publications Soil and Land Systems publications |
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