Salicylic acid application alleviates cadmium accumulation in brown rice by modulating its shoot to grain translocation in rice.
Salicylic acid application alleviates cadmium accumulation in brown rice by modulating its shoot to grain translocation in rice.
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DOI：
10.1016/j.chemosphere.2020.128034
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发表时间：
2021-01
期刊：
影响因子：
8.8
通讯作者：
Feijuan Wang;Haifeng Tan;Yiting Zhang;Lihong Huang;Hexigeduleng Bao;Yanfei Ding;Zhixiang Chen;
中科院分区：
文献类型：
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作者：
Feijuan Wang;Haifeng Tan;Yiting Zhang;Lihong Huang;Hexigeduleng Bao;Yanfei Ding;Zhixiang Chen;
镉（Cd）污染对人类健康构成严重威胁，已被公认为是农业系统和作物生产的主要威胁。水杨酸（SA）是一种在镉毒害中起重要作用的信号分子。在此之前，我们发现用水杨酸喷洒水稻可以减少镉污染土壤中水稻籽粒中镉的积累。本研究探讨了水杨酸喷施降低水稻籽粒镉积累的具体机理。结果表明，水杨酸处理可通过提高水稻体内抗氧化酶的活性来减轻水稻对Cd的毒害，而不是通过改变土壤的pH值、Cd的全量或有效态来减轻水稻对Cd的毒害。SA处理降低水稻籽粒中Cd积累的关键因素是降低水稻开花期叶片中Cd含量。这表明水杨酸可以调节水稻地上部镉的积累，减少镉向籽粒的转运。此外，水杨酸还可以增加水稻叶片中H2O2的含量，激活水杨酸信号通路，调节水稻叶片中Cd转运蛋白OsLCT 1和OsLCD的表达水平，从而提高水稻对Cd的耐性，减少水稻籽粒中Cd的积累。因此，喷施水杨酸可作为科普水稻土镉污染的有效措施。
Cadmium (Cd) contamination, which poses a serious threat to human health, has been recognized as a major threat to the agricultural system and crop production. Salicylic acid (SA) is a signaling molecule that plays an important role in against Cd toxicity. Previously, we found that spraying rice with SA could reduce the Cd accumulation in rice grains grown in Cd-contaminated soil. In this study, we studied the specific mechanism of SA spray on reducing Cd accumulation in rice grain. The results showed that treatment with SA could alleviate Cd toxicity in rice by increasing the activities of antioxidant enzymes that reduce hydrogen peroxide (H2O2) accumulation, but not by changing the pH, or total or available Cd of the soil. The key factor by which SA treatment reduced Cd accumulation in rice grains was by decreasing the Cd content in rice leaves at the flowering stage. This indicated that SA could modulate the Cd accumulation in shoots, reducing the Cd translocation to rice grains. Furthermore, SA could increase the H2O2content, activating the SA-signaling pathway and modulating the expression levels of Cd transporters (OsLCT1andOsLCD) in rice leaves to increase Cd tolerance and reduce Cd accumulation in the rice grain. Thus, spraying rice with SA may be effective measure to cope with Cd contamination in paddy soils.