Influence of iron plaque on the uptake and accumulation of chromium by rice (oryza sativa L.) seedlings: Insights from hydroponic and soil cultivation
Influence of iron plaque on the uptake and accumulation of chromium by rice (oryza sativa L.) seedlings: Insights from hydroponic and soil cultivation
复制标题
铁斑对水稻（oryza sativa L.）幼苗吸收和积累铬的影响：来自水培和土壤栽培的见解
DOI：
10.1016/j.ecoenv.2018.06.063
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发表时间：
2018
影响因子：
6.8
通讯作者：
Ding J
中科院分区：
文献类型：
--
作者：
Xu Bo;Wang Fang;Zhang Qiuhong;Lan Qingqing;Liu Chaoyang;Guo Xuan;Chen Yanhui;Wang Guo;Cai Qiuying;Ding Jing;Ding J
研究了铁膜形成对水稻幼苗吸收和积累铬（Cr）的影响。使用水培和土壤实验进行评估，其中每3个水平的Fe补充添加到Hoagland溶液（0，30和100 mg Fe 2 +L-1）和典型的水稻土（0，1和2 g Fe 2 +kg-1）。对于每种处理，水稻幼苗暴露于不同水平的铬酸盐，0，0.5，2，5，10和20 mg L-1的溶液或300 mg kg-1的土壤中。低水平的铬供应（0.5，2和5毫克L-1）促进根生物量，而高水平（10和20毫克L-1）降低根和地上部生物量，破坏铁膜的密度和完整性。供铁显著增加了水稻植株铁膜中铬的比例，但降低了铁膜中铬的比例。水培试验结果表明，在10和20 mg L−1Cr胁迫下，供铁100 mg L− 1形成的铁膜显著降低了水稻幼苗地上部Cr的积累。土培试验还表明，外源铁处理显著降低了水稻幼苗叶片和茎中铬的含量。这些结果表明，适量的铁膜可有效降低水稻对铬的吸收和积累，对采取措施调控水稻籽粒中铬的积累具有重要意义。
The effects of iron plaque formation on chromium (Cr) uptake and accumulation by rice seedlings (Oryza sativaL.) were assessed using hydroponic and soil experiments, where each 3 levels of Fe supplementation were added to Hoagland solution (0, 30, and 100 mg Fe2+L−1) and a typical paddy soil (0, 1, and 2 g Fe2+kg−1). For each treatment, rice seedlings were exposed to different levels of Cr as chromate at 0, 0.5, 2, 5, 10, and 20 mg L−1in solution or 300 mg kg−1in soil. Low levels of Cr supply (0.5, 2, and 5 mg L−1) promoted root biomass, while high levels (10 and 20 mg L−1) decreased root and shoot biomass and undermined the density and integrity of iron plaque. Iron supply significantly increased the proportion of Cr in iron plaque, but decreased that in rice plants. The results of hydroponic experiment showed that iron plaque formed with Fe supply at 100 mg L−1markedly reduced Cr accumulation in shoots of rice seedlings when exposure to 10 and 20 mg L−1Cr. The soil culture experiment also demonstrated that exogenous Fe addition significantly decreased Cr concentration in leaf and stem of rice seedlings. These results suggested that iron plaque with appropriate amount was effective to reduce the uptake and accumulation of Cr in rice plants, which have strong implication for taking measures to regulate Cr accumulation in rice grains.