Record ID No. |
2541 |
Author(s) |
Smith S E., Christophersen H M., Pope S., Smith F A. , 2010 |
Affiliation |
Soil and Land Systems, School of Earth and Environmental Sciences, Waite Campus, The University of Adelaide, Adelaide, South Australia 5005, Australia. sally.smith@adelaide.edu.au |
Title |
Arsenic uptake and toxicity in plants: integrating mycorrhizal influences |
Source. Vol.(no):Page |
Plant and Soil. 327(1/2):1-21p. |
Categories |
Arbuscular Mycorrhiza |
Subjects |
Reviews |
Sub-subjects |
Miscellaneous |
Host |
Plants |
Organism |
AMF |
Country |
Australia |
Abstracts |
Arsenic (As) contamination of soil and water is a global problem that impacts on many areas of biology. This review firstly covers aspects of soil chemistry and soil-plant interactions relevant to the ways plants take up As (particularly arsenate (As(V))) from aerobic soils, with especial attention to As-phosphorus (P) interactions. It then assesses the extent to which studies of plant As tolerance based on short-term uptake of As(V) from nutrient solutions can be extrapolated to longer-term growth in contaminated soil. Mycorrhizal symbioses are then highlighted, because they are formed by ~90% of higher plants, often with increased uptake of phosphate (Pi) compared with non-mycorrhizal (NM) counterparts. It is therefore likely that mycorrhizas influence As(V) uptake. Published work shows that arbuscular mycorrhizal (AM) plants (the most common mycorrhizal type) have higher P/As ratios than NM plants, and this would be expected to affect sensitivity to soil As. We discuss ways in which higher P/As selectivity might result from differential operation of P and As uptake pathways in AM compared with NM plants, taking into account new understanding of P uptake mechanisms. We also give suggestions for future research required to increase understanding of mechanisms of As(V) uptake, and its interactions with plant P. |