Sulfate application decreases translocation of arsenic and cadmium within wheat (Triticum aestivum L.) plant
Sulfate application decreases translocation of arsenic and cadmium within wheat (Triticum aestivum L.) plant
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硫酸盐的施用减少了小麦 (Triticum aestivumL.) 植物中砷和镉的易位
DOI：
10.1016/j.scitotenv.2020.136665
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发表时间：
2020
影响因子：
9.8
通讯作者：
Hongxiang Ma
中科院分区：
文献类型：
--
作者：
Gaoling Shi;Haiying Lu;Huan Liu;Laiqing Lou;Pingping Zhang;Guicheng Song;Huimin Zhou;Hongxiang Ma
砷（As）和镉（Cd）在土壤中表现出不同的命运，这使得降低As和Cd在作物可食部分中积累的努力变得复杂。本文通过盆栽试验研究了硫酸盐对污染土壤中小麦籽粒中As、Cd积累的影响。与对照（不添加硫酸钠）相比，添加120 mg kg− 1硫酸钠使根际土壤pH值从7.27降低到7.10，并增加了土壤可提取态Cd的浓度，但对土壤可提取态As的浓度没有显著影响。然而，硫酸钠的添加降低了小麦籽粒中As和Cd的含量，这与As和Cd从根和稻草到籽粒的转运减少有关，而不是从土壤到根的转运减少。此外，硫酸钠的加入显着降低膜脂过氧化和增强光合作用，同时增加氮，磷，硫的吸收。这些影响增加了生长和籽粒重的植物生长在As和Cd复合污染的土壤。我们的研究结果提供了深入了解硫酸盐调节As和Cd的吸收和转运在小麦的机制，此外，我们的研究结果将使制定策略，以减少As和Cd共污染土壤中生长的小麦籽粒中As和Cd的浓度。
Arsenic (As) and cadmium (Cd) typically exhibit divergent fates in soil, which complicates efforts to decrease As and Cd accumulation in the edible parts of crops. Here, we performed pot experiments to examine the effect of sulfate application on As and Cd accumulation in the grain of wheat grown in contaminated soil. Compared to the control (no sodium sulfate addition), application of 120 mg kg−1sodium sulfate decreased the rhizosphere soil pH from 7.27 to 7.10 and increased the soil extractable Cd concentration; however, it did not significantly influence the soil extractable As concentration. However, sodium sulfate addition decreased As and Cd concentrations in wheat grain, in association with decreased As and Cd translocation from root and straw to grain, rather than from soil to root. Furthermore, sodium sulfate addition significantly decreased membrane lipid peroxidation and enhanced photosynthesis, while increasing the uptake of nitrogen, phosphorus, and sulfur. These effects increased the growth and grain weight of plants grown in As and Cd co-contaminated soil. Our findings provide insight into the mechanisms by which sulfate modulates As and Cd uptake and translocation in wheat; moreover, our findings will enable formulation of strategies to decrease As and Cd concentrations in the grain of wheat grown in As and Cd co-contaminated soil.