Uptake, translocation and transformation of antimony in rice (Oryza sativa L.) seedlings
Uptake, translocation and transformation of antimony in rice (Oryza sativa L.) seedlings
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水稻（Oryza sativa L.）幼苗对锑的吸收、转运和转化
DOI：
10.1016/j.envpol.2015.11.033
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发表时间：
2016-02-01
影响因子：
8.9
通讯作者：
Wang, Xilong
中科院分区：
文献类型：
--
作者：
Cai, Fei;Ren, Jinghua;Wang, Xilong
锑作为一种有毒的准金属，由于其在许多地方的严重污染而受到越来越多的关注。水稻已被确定为锑矿区附近居民的锑的主要摄入途径。采用水培试验研究了不同水稻品种在0.2和1.0mg/L Sb（V）胁迫下对Sb的吸收、转运和转化的差异。结果表明，在低、高浓度Sb（V）处理下，N品种根表铁膜质量浓度（mg/kg FW）最高。随着水稻根表铁膜质量浓度的增加，水稻根表铁膜中Sb的积累量显著增加。水稻根表铁膜总量（mg/pot）随Sb（V）浓度的增加而增加，这与水稻根膜脂质过氧化作用增强密切相关。水稻根中Sb的浓度百分比随铁膜中相应值的增加而显著降低，表明铁膜的形成强烈抑制了水稻根对Sb的吸收。水稻各组织中Sb含量的大小顺序为根>茎>叶。粳稻（品种N和Z）比杂交籼稻（品种F和G）表现出更强的Sb从根向茎转移的倾向。随着Sb暴露浓度的增加，Sb从品种F的根向茎和叶的转运急剧增加。Sb（V）在水稻组织中可被还原为Sb（III），尤其是在水稻茎中（占总Sb的10-26%）。从食品安全的角度考虑，应考虑不同水稻品种对Sb的吸收、迁移和转化的差异。(C)2015爱思唯尔有限公司版权所有。
Antimony (Sb), as a toxic metalloid, has been gaining increasing research concerns due mainly to its severe pollution in many places. Rice has been identified to be the dominant intake route of Sb by residents close to the Sb mining areas. A hydroponic experiment was conducted to investigate the difference in uptake, translocation and transformation of Sb in rice seedlings of four cultivars exposed to 0.2 or 1.0 mg/L of Sb(V). The results showed that mass concentration of iron plaque (mg/kg FW) formed at the root surfaces of cultivar N was the highest among all tested cultivars at both low and high exposure levels of Sb(V). The accumulated Sb concentration in iron plaque significantly increased with an increase in mass concentration of iron plaque formed at the rice root. The total amount of iron plaque (mg/pot) at rice root generally increased with increasing exposed Sb(V) concentration, which was closely associated with the increasing lipid peroxidation in roots. Concentration percentage of Sb in rice root significantly reduced as the corresponding value in the iron plaque increased, suggesting that iron plaque formation strongly suppressed uptake of Sb by rice root. Sb concentration in rice tissues followed an order: root > stem, leaf. The japonica rice (cultivars N and Z) exhibited a stronger translocation tendency of Sb from root to stem than indica hybrid rice (cultivars F and G). Translocation of Sb from root of cultivar F to its stem and leaf was sharply enhanced with increasing Sb exposure concentration. Sb(V) could be reduced to Sb(III) in rice tissues, especially in stems (10-26% of the total Sb). For the sake of food safety, the difference in uptake, translocation and transformation of Sb in rice species planted in Sbcontaminated soils should be taken into consideration. (C) 2015 Elsevier Ltd. All rights reserved.