State Key Lab of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
Environ Sci Pollut Res Int. 2014 Mar;21(5):3955-62. doi: 10.1007/s11356-013-2321-6. Epub 2013 Dec 3.
There is a lack of information on the interactive relationship of absorption and transformation between two inorganic arsenic (As) species and two inorganic selenium (Se) species in rice grown under hydroponic condition. Interactive effects of inorganic As (As(III)) and (As(V)) and Se (Se(IV)and Se(VI)) species on their uptake, accumulation, and translocation in rice (Oryza sativa L.) seedlings were investigated in hydroponic culture. The results clearly showed the interactive effects of inorganic As and Se on their uptake by rice. The presence of Se reduced the sum of As species in the rice shoots regardless of Se speciation. If Se is present as Se(IV), then is it is accompanied by a corresponding increase of the sum of As species, but if Se is present as Se(VI), then there is no change in the sum of As species in rice roots. These effects are observed regardless of initial As speciation. When the rice plants are exposed to Se(IV), the presence of As increases the sum of Se species in the roots, and decreases the sum of Se species in the corresponding shoots. This effect is more pronounced for As(III) than for As(V). There is no effect on Se during exposure to Se(VI). Co-existence of As also increased SeMet in rice roots.
在水培条件下种植的水稻中，两种无机砷（As）形态和两种无机硒（Se）形态之间的吸收和转化的相互作用关系的信息还很缺乏。本研究在水培条件下，调查了无机 As（As(III)）和（As(V)）与 Se（Se(IV)和 Se(VI)）形态之间的相互作用对水稻幼苗吸收、积累和转运的影响。结果清楚地表明了无机 As 和 Se 对水稻吸收的相互作用。无论 Se 的形态如何，Se 的存在都会降低水稻地上部分的总 As 含量。如果 Se 以 Se(IV)的形式存在，那么总 As 形态会相应增加，但如果 Se 以 Se(VI)的形式存在，那么水稻根系中总 As 形态没有变化。这些影响与初始 As 形态无关。当水稻植株暴露于 Se(IV)时，As 的存在会增加根系中 Se 形态的总和，并减少相应地上部分中 Se 形态的总和。对于 As(III)，这种效应比 As(V)更为明显。而暴露于 Se(VI)时则没有影响。共存的 As 也会增加水稻根系中的 SeMet。
