John Wiley & Sons, Ltd.

The effects of phosphate on arsenic uptake and toxicity alleviation in tobacco genotypes with differing arsenic tolerances

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Phosphate (PO43‐) has been reported to suppress arsenate (Asv) uptake in plants. However, its effects on controlling the availability of Asv in tobacco genotypes with different arsenic (As) tolerances has not been fully explored. In the present study, the effects of PO43‐ on Asv uptake were investigated in a hydroponic culture using 2 tobacco (Nicotiana tabacum) genotypes (ZY90 and FSMY) that differed in Asv tolerance. A total of 9 treatment combinations comprising Asv 0, 10, and 100 μM and PO43‐‐ treatments 0, 50 and 500 μM were used. The results showed that ZY90 had greater reductions in leaf photosynthetic parameters, root and shoot dry weight, length, and nutrient content than did FSMY when exposed to Asv stress. The addition of external PO43‐ 500 μM significantly suppressed Asv (100 μM) uptake in both FSMY and ZY90, with the effect being more pronounced in FSMY. Greater PO43‐ uptake in plants significantly reduced the influx of Asv, causing an increase in photosynthesis and nutrient uptake. Phosphate supply increased superoxide dismutase (SOD), catalase (CAT) activity and malondialdehyde (MDA) content. The current study showed that PO43‐ is an effective competitive inhibitor of Asv, and it can be effectively used to control Asv accumulation in tobacco plants. Environ Toxicol Chem © 2014 SETAC

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