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Type: | Journal article |
Title: | No evidence for competition between arsenate and phosphate for uptake from soil by medic or barley |
Author: | Christophersen, H. Smith, S. Pope, S. Smith, F. |
Citation: | Environment International, 2009; 35(3):485-490 |
Publisher: | Pergamon-Elsevier Science Ltd |
Issue Date: | 2009 |
ISSN: | 0160-4120 1873-6750 |
Statement of Responsibility: | H.M. Christophersen, S.E. Smith, S. Pope, F.A. Smith |
Abstract: | We investigated the effects of phosphorus (P) supply on the uptake and toxicity of arsenate (As(V)) in two plant species (Medicago truncatula and Hordeum vulgare) grown in soil/sand mixes. Our initial hypothesis was that competition between phosphate (Pi) and As(V) for uptake would be observed, and that this would be the basis for the 'protective' effect of P with respect to As toxicity, as shown in solution culture. Addition of P to the soil/sand mixes did not have major effects on water extractable As, or vice versa. We observed that toxic effects of As(V) on plant growth were ameliorated by increased P in both plant species. However, we found no evidence that increased P supply reduced specific uptake of As(V) on a molar basis, so that competition with Pi could not be the basis for the effect. A more complex mechanism of protection is indicated which might relate to different Pi transport systems being expressed at different P levels. |
Keywords: | Arsenic Arsenate (As(V)) uptake Phosphorus Toxicity |
DOI: | 10.1016/j.envint.2008.07.011 |
Grant ID: | ARC |
Published version: | http://dx.doi.org/10.1016/j.envint.2008.07.011 |
Appears in Collections: | Aurora harvest Earth and Environmental Sciences publications |
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