Al Souki Karim Suhail, Liné Clarisse, Moravec Jiří, Douay Francis, Pourrut Bertrand
Department of Environmental Chemistry and Technology, Faculty of Environment, Jan Evangelista Purkyně University in Ústí nad Labem, Pasteurova 3632/15, 400 96 Usti nad Labem, Czech Republic.
Laboratoire Génie Civil et géo-Environnement (LGCgE), ISA Lille, Junia, 48 Boulevard Vauban, CEDEX, F-59046 Lille, France.
Plants (Basel). 2022 Mar 30;11(7):945. doi: 10.3390/plants11070945.
The positive impact on restoring soil functionality, decreasing toxic elements (TE) bioaccessibility, and enhancing soil physicochemical and biological parameters established a consensus on considering a × convenient species for phytomanaging wide TE contaminated areas. Nevertheless, information about the plant's mode of reaction to elevated soil multi-TE concentrations is still scarce. For the sake of investigating the miscanthus response to stressful TE concentrations, an ex-situ pot experiment was initiated for 18 months, with three miscanthus cultivars referred to as B, U, and A planted in soils with gradient Cd, Pb, and Zn concentrations. A non-contaminated control soil was introduced as well, and plants were cultivated within. Results revealed that the long exposure to increasing soil TE concentrations caused the number of tillers per plant to decline and the TE concentrations in the leaves to boost progressively with the soil contamination. The photosynthetic pigments (chlorophyll a, b, and carotenoids) were negatively affected as well. However, the phenolic compounds, flavonoids, tannins, and anthocyanins, along with the antioxidant enzymatic activities of superoxide dismutase, ascorbate peroxidase, and glutathione reductase elevated progressively with the TE concentration and exposure duration. Conclusively, miscanthus plants demonstrated an intensified and synchronized antioxidative activity against the TE concentration.
对恢复土壤功能、降低有毒元素（TE）生物可利用性以及改善土壤物理化学和生物学参数的积极影响，使得人们在考虑选用一种方便的植物物种来对大面积TE污染区域进行植物修复方面达成了共识。然而，关于该植物对土壤中多种TE浓度升高的反应模式的信息仍然匮乏。为了研究芒草对高浓度TE胁迫的反应，开展了一项为期18个月的异位盆栽试验，将三个芒草品种（分别称为B、U和A）种植在镉、铅和锌浓度呈梯度变化的土壤中。同时引入了未受污染的对照土壤，并在其中种植植物。结果表明，长期暴露于不断增加的土壤TE浓度下，导致单株分蘖数下降，叶片中的TE浓度随着土壤污染程度的加重而逐渐升高。光合色素（叶绿素a、叶绿素b和类胡萝卜素）也受到了负面影响。然而，酚类化合物、黄酮类化合物、单宁和花青素，以及超氧化物歧化酶、抗坏血酸过氧化物酶和谷胱甘肽还原酶的抗氧化酶活性随着TE浓度和暴露时间的增加而逐渐升高。总之，芒草植物对TE浓度表现出增强且同步的抗氧化活性。
