Journal
CURRENT OPINION IN PLANT BIOLOGY
Volume 12, Issue 3, Pages 364-372Publisher
CURRENT BIOLOGY LTD
DOI: 10.1016/j.pbi.2009.05.001
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Funding
- Belgian Science Policy [IAP PV/33]
- Foods National de la Recherche Scientifique (FRS-FNRS)
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The metalloid arsenic and the heavy metal cadmium have no demonstrated biological function in plants. Both elements are highly toxic and of major concern with respect to their accumulation in soils, in the food-chain or in drinking water. Arsenate is taken up by phosphate transporters and rapidly reduced to arsenite, As(III). In reducing environments, As(III) is taken up by aquaporin nodulin 26-like intrinsic proteins. Cd2+ enters the root via essential metal uptake systems. As(III) and Cd2+ share some similarity between their toxicology and sequestration machineries. Recent progress in understanding the mechanisms of As and Cd uptake and detoxification is presented, including the elucidation of why rice takes up so much arsenic from soil and of mechanisms of As and Cd hypertolerance.
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