Effect of selenium in soil on the toxicity and uptake of arsenic in rice plant
Effect of selenium in soil on the toxicity and uptake of arsenic in rice plant
复制标题
土壤硒对水稻砷毒性及吸收的影响
DOI：
10.1016/j.chemosphere.2019.124712
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发表时间：
2020-01-01
期刊：
影响因子：
8.8
通讯作者：
Yang, GuiDi
中科院分区：
文献类型：
--
作者：
Pokhrel, Ganga Raj;Wang, Kai Teng;Yang, GuiDi
硒可以通过增强抗氧化能力来调节砷的毒性，但硒与硒营养之间的拮抗作用以及砷形态从水稻土向水稻不同器官的转运作用尚不清楚。采用盆栽试验，研究了亚硒酸盐和硒酸盐对2个籼稻品种（明恢63和鲁优明占）砷和砷毒性的影响，以及水稻不同器官对土壤中砷形态的吸收和转运。结果表明，亚硒酸盐和硒酸盐能显著降低土壤孔隙水中的砷含量，从而抑制水稻根系对砷的吸收。而亚硒酸盐和硒酸盐的存在并没有降低两个籼稻品种根际孔隙水中砷的含量。在低砷水稻土条件下，亚硒酸盐和硒酸盐对水稻吸收砷和砷有较好的拮抗作用。然而，这种拮抗作用取决于水稻品种，砷的物种和土壤中的砷水平。添加亚硒酸盐和硒酸盐对两个籼稻品种吸收三甲基氧化砷和二甲基胂酸既有协同作用，也有抑制作用，但其作用机制尚不清楚。亚硒酸盐和硒酸盐均能有效抑制砷/砷复合添加水稻土中无机砷从水稻根系向地上部转移，但硒酸盐对无机砷转移因子的抑制作用强于亚硒酸盐。(C)2019爱思唯尔有限公司版权所有。
Selenium can regulate arsenic toxicity by strengthening antioxidant potential, but the antagonism between selenite or selenate nutrient and the translocation of arsenic species from paddy soil to different rice organs are poorly understood. In this study, a pot experiment was designed to investigate the effect of selenite or selenate on arsenite or arsenate toxicity to two indica rice cultivars (namely Ming Hui 63 and Lu You Ming Zhan), and the uptake and transportation of arsenic species from paddy soil to different rice organs. The results showed that selenite or selenate could significantly decrease the arsenate concentration in pore water of soils, and thus inhibited arsenate uptake by rice roots. However, the existence of selenite or selenate didn't decrease arsenate concentration in rhizosphere pore water of two indica rice cultivars. There existed good antagonistic effect between selenite or selenate and the uptake of arsenite and arsenate in rice plant in the case of low arsenic paddy soil. However, this antagonism depended on rice cultivars, arsenic species and arsenic level in soil. There existed both synergistic and inhibiting effects between the addition of selenite or selenate and the uptake of trimethylarsinoxide and dimethylarsinic acid by two indica rice cultivars, but the mechanism was unclear. Both selenite and selenate are all effective to decrease the translocation of inorganic arsenic from the roots to their above-ground rice organs in arsenite/arsenate-spiked paddy soil, but selenate had stronger inhibiting effect on their transfer factors than selenite. (C) 2019 Elsevier Ltd. All rights reserved.