School of Municipal and Environment Engineering, Qingdao University of Technology, Qingdao, 266000, People's Republic of China.
College of Resources and Environment, Yunnan Agricultural University, Kunming, 650000, People's Republic of China.
Environ Sci Pollut Res Int. 2022 Oct;29(46):70508-70519. doi: 10.1007/s11356-022-20778-x. Epub 2022 May 19.
Erigeron breviscapus (Vant.) Hand.-Mazz. is an important medicinal plant; however, its quality is severely diminished by cadmium (Cd) pollution. Sulfur fertilisation can improve the production and application of E. breviscapus. This study examined Cd stress alleviation in the soil-plant system and determined the plant growth response after the application of sulfur fertiliser. The soil Cd concentration used in the treatments was 100 g·kg, and the sulfur fertiliser application rates were 0.1, 0.2, and 0.3 g·kg. Using pot experiments, we explored the impacts of high, medium, and low amounts of sulfur fertiliser on Cd accumulation and the quality and activity of E. breviscapus. The results showed that the application of sulfur fertiliser promoted Cd transformation to residual Cd under oxidation conditions, reducing Cd accumulation in E. breviscapus. Throughout the growth period, the application of sulfur fertiliser increased the soluble protein content and antioxidant enzyme activity, which alleviated Cd toxicity. The net photosynthetic rate, transpiration rate, intercellular CO concentration, chlorophyll level, and leaf width increased significantly. The biomass content of E. breviscapus also increased. Sulfur fertiliser improves the quality of herbaceous medicinal plants by reducing Cd accumulation and increasing scutellarin, chlorogenic, isochlorogenic acid B, and isochlorogenic acid C contents. A reasonable application of sulfur fertiliser is essential for improving E. breviscapus quality. This study provides a new method to reduce the ecological risk of planting herbaceous medicinal plants in Cd-contaminated soil.
短葶飞蓬（Vant.）Hand.-Mazz. 是一种重要的药用植物；然而，其质量因镉（Cd）污染而严重下降。硫磺施肥可以提高短葶飞蓬的产量和应用。本研究考察了土壤-植物系统中 Cd 胁迫的缓解，并确定了施用硫磺肥后植物的生长反应。处理中使用的土壤 Cd 浓度为 100 g·kg，硫磺肥施用量为 0.1、0.2 和 0.3 g·kg。通过盆栽实验，我们探讨了高、中、低量硫磺肥对 Cd 积累和短葶飞蓬质量和活性的影响。结果表明，硫磺肥的施用促进了 Cd 在氧化条件下向残余 Cd 的转化，减少了短葶飞蓬中 Cd 的积累。在整个生长期间，施用硫磺肥增加了可溶性蛋白含量和抗氧化酶活性，从而缓解了 Cd 毒性。净光合速率、蒸腾速率、胞间 CO 浓度、叶绿素水平和叶片宽度均显著增加。短葶飞蓬的生物量含量也增加了。硫磺肥通过减少 Cd 积累和增加野黄芩苷、绿原酸、异绿原酸 B 和异绿原酸 C 的含量来提高草本药用植物的品质。合理施用硫磺肥对于提高短葶飞蓬的品质至关重要。本研究为降低种植草本药用植物在 Cd 污染土壤中的生态风险提供了一种新方法。
