Arsenate phytotoxicity regulation by humic acid and related metabolic mechanisms
Arsenate phytotoxicity regulation by humic acid and related metabolic mechanisms
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腐殖酸对砷酸盐药害的调控及相关代谢机制
DOI：
10.1016/j.ecoenv.2020.111379
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发表时间：
2021
影响因子：
6.8
通讯作者：
Liu Xiaowei
中科院分区：
文献类型：
--
作者：
Wang Qi;Wen Jingyu;Zheng Jinxin;Zhao Jiaqi;Qiu Chunsheng;Xiao Di;Mu Li（通讯作者）;Liu Xiaowei
使用含砷灌溉水导致大面积的砷污染农田，并因此，植物和食品已成为严重的中毒。腐殖酸（HA）可以与金属络合，这反过来又影响金属的行为。本文研究了不同浓度砷处理下生菜对砷的积累，并研究了腐殖酸对砷积累和毒性的影响。添加HA对生菜中的砷含量没有显著影响，但对抗氧化酶活性有显著影响，提高了生菜的抗氧化能力。此外，HA还促进了叶片中镁、钙、钼、锰等营养元素的积累。砷酸盐破坏代谢途径，如氨基酸代谢、碳水化合物代谢和氨酰-tRNA生物合成。HA的添加增加了生菜中氨基酸和糖的含量，从而促进了生菜的生长。本研究探讨了HA对As积累和相关生理变化（抗氧化酶活性，营养物质的吸收和代谢机制）的影响，并提供了HA，这是相对便宜的调节As污染的见解。
The use of irrigation water containing arsenic (As) had led to large areas of As-contaminated farmland, and as a result, plants and food have become severely poisoned. Humic acid (HA) can be complexed with metals, which in turn affects the metals’ behavior. Herein, we explored the accumulation of arsenate in lettuce treated with different concentrations of arsenate and studied the effects of HA on the accumulation and toxicity of arsenate. The addition of HA did not cause significant changes in the arsenate content in lettuce but had a significant effect on the activity of antioxidant enzymes, which improved the antioxidant capability of the lettuce plants. Furthermore, HA promoted the accumulation of nutrients, such as magnesium (Mg), calcium (Ca), molybdenum (Mo) and manganese (Mn), in the leaves. Arsenate disrupted metabolic pathways, such as amino acid metabolism, carbohydrate metabolism, and aminoacyl-tRNA biosynthesis. The addition of HA increased the contents of amino acids and sugars, thereby improving lettuce growth. The present study explored the effects of HA on As accumulation and related physiological changes (antioxidant enzyme activities, absorption of nutrients and metabolic mechanisms) and provided insights into the regulation of As contamination by HA, which is relatively inexpensive.