Phosphate and arsenate interactions in the rhizosphere of canola (Brassica napus)
Mieke Quaghebeur A B and Zed Rengel AA Soil Science and Plant Nutrition, School of Earth and Geographical Sciences, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.
B Current address: Waste and Secondary Raw Materials, Flemish Institute for Technological Research (Vito), Boeretang 200, BE-2400 Mol, Belgium. Corresponding author. Email: mieke.quaghebeur@vito.be
Functional Plant Biology 31(11) 1085-1094 https://doi.org/10.1071/FP04015
Submitted: 21 January 2004 Accepted: 9 August 2004 Published: 18 November 2004
Abstract
Arsenate [As(V)] and phosphate [P(V)] compete for the same uptake systems in plant roots. For this reason, P(V) is often added to As-contaminated soils to reduce As(V) uptake and alleviate As toxicity. However, the addition of P(V) can result in an increase in As concentrations in plant tissues, which is often attributed to an increase in As(V) availability, although direct evidence for this explanation is lacking. Rhizosphere and batch desorption experiments were conducted to investigate (i) the effect of As(V) and P(V) additions, and plant phosphorus (P) status, on As(V) uptake by canola (Brassica napus L.) and (ii), P(V) and As(V) interactions at the surface of roots and specific soil particles (goethite and kaolinite). Results showed that P-deficient canola took up more As(V) from arsenated kaolinite, but transported less As from roots to shoots, than P-adequate canola. The addition of P(V) adsorbed on substrate increased As(V) uptake by canola but desorption experiments revealed that the addition of phosphated kaolinite to arsenated kaolinite was not likely to increase As(V) availability in the rhizosphere. It was concluded that plant P status together with P(V) and As(V) interactions at the surfaces of roots and soil particles need to be considered to properly asses P(V) and As(V) interactions in the plant–soil continuum.
Keywords: arsenate, canola, phosphate, rhizosphere, soil contamination.
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