Reduction of the risk of arsenic accumulation in rice by the water management and material application in relation to phosphate status
Reduction of the risk of arsenic accumulation in rice by the water management and material application in relation to phosphate status
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DOI：
10.1080/17429145.2015.1016129
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发表时间：
2015-01
影响因子：
3.2
通讯作者：
S. Matsumoto;J. Kasuga;Nozomi Taiki;T. Makino;T. Arao
中科院分区：
文献类型：
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作者：
S. Matsumoto;J. Kasuga;Nozomi Taiki;T. Makino;T. Arao
为了减少风险的过量砷（As）在水稻中使用农艺方法适用于普通农业在未污染的土壤中与As，我们研究了不同的开始时期的排水抽穗后和应用铁（Fe）或硅酸盐（Si）材料的混凝土框架填充的土壤收集从周围的前As污染区域的影响。As在籽粒中的浓度降低，而镉（Cd）的浓度增加排水开始早。因此，保持抽穗后的氧化条件显着降低了粮食中的砷浓度。与对照相比，施用铁材料显著降低了籽粒中砷的浓度。随着排水开始时间的推迟，秸秆和粮食中磷的浓度比（即磷在秸秆和粮食中的分配率）显著降低。在培养液中P水平减半的溶液培养实验中也得到了类似的结果。籽粒与秸秆的磷浓度比与籽粒中的砷浓度呈负相关，表明磷和砷的竞争作用使磷从秸秆向籽粒的转运速率增加，从而抑制了砷在籽粒中的积累。需要进一步评估Fe、Si和P对水分管理和施肥的影响，以降低水稻籽粒中As积累的风险。
To reduce the risk of excessive arsenic (As) in rice by using agronomic methods applicable to common farming in uncontaminated soil with As, we examined the effect of different start periods of drainage after heading and the application of iron (Fe) or silicate (Si) materials in concrete frames filled with soil collected from an area surrounding a former As-polluted region. The concentration of As in the grain decreased with the early start of drainage, whereas the cadmium (Cd) concentration increased. Thus, maintaining the oxidative condition after heading significantly decreases the concentration of As in the grain. Fe material application significantly decreased the concentration of As in the grain compared to the control. The phosphorus (P) concentration ratio of grain to straw (which we regarded as the P distribution rate of grain and straw) was significantly lower with the delay of the start of drainage. Similar results were obtained in the solution culture experiment in which the P level was decreased by half in the culture solution. A negative correlation between the P concentration ratio of grain to straw and the concentration of As in the grain was observed, indicating that an increase in the P translocation rate from straw to grain would inhibit the accumulation of As in the grain due to the competition of P and As. Further evaluations of the effects of Fe, Si, and P on water management and fertilization are needed to reduce the risk of As accumulation in rice grain.