Effects of boron nutrition on arsenic uptake and efflux by rice seedlings
Arsenic in the Environment(2018)
Abstract
The impacts of boron (B) through root application and foliar spray on arsenic (As) uptake and efflux by/in rice seedlings (Olyza sativa L.) were investigated in three hydroponic experiments. Addition of B in culture medium didn't alter concentrations of arsenite [As(III)], arsenate [As(V)] and total As in rice seedlings under either As(III) or As(V) exposure. Foliar B supply decreased root As concentrations by 20.9% under As(V) treatment and by 12.6% under As(III) treatment, respectively, yet didn't significantly decrease shoot As concentrations. Concentrations of As(V) were positively related to B concentration in rice root under As(V) treatment following foliar B supply (P < 0.05). Rice seedlings extruded 105.2% more As after As(III)-pretreatment than after As(V)-pretreatment. Foliar B supply increased the amount of As excreted by As(III)-pretreated rice root by 14.0%-16.9% (P > 0.05) and made no effect on As efflux for As(V)-pretreatment seedlings. These results indicate that root application of B at four times the concentration of As can hardly decrease As accumulation by rice, whereas foliar B supply is conducive to a decline in As acquisition by rice root. It is likely that B channel is at least not the main pathway for As(III) entering into rice root, and As(V) distribution mechanism in rice plant may share with B.
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