Dridi Nesrine, Ferreira Renata, Bouslimi Houda, Brito Pedro, Martins-Dias Susete, Caçador Isabel, Sleimi Noomene
LR. RME-Resources, Materials and Ecosystems, Faculty of Sciences of Bizerte, University of Carthage, Bizerte 7021, Tunisia.
CERENA, Centro de Recursos Naturais e Ambiente, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal.
Plants (Basel). 2022 Apr 5;11(7):988. doi: 10.3390/plants11070988.
Rare earth elements (REEs) present a group of nonessential metals for the growth and development of plants. At high concentrations, they can induce internal stress and disturb the physiological and biochemical mechanisms in plants. The potential uptake of lanthanum (La) and cerium (Ce) by the horticultural plant and the effect of these elements on its growth, its absorption of macroelements, and the contents of phenolic compounds and flavonoids were assessed. The plants were exposed to 0, 1, 2.5, 5, and 10 µM of La and Ce for 14 days. The results showed a remarkable accumulation of the two REEs, especially in the roots, which was found to be positively correlated with the total phenolic compound and flavonoid content in the plant shoots and roots. The plant's growth parameter patterns (such as dry weight and water content); the levels of potassium, calcium, and magnesium; and the tolerance index varied with the concentrations of the two studied elements. According to the tolerance index values, had more affinity to La than to Ce. Although these metals were accumulated in tissues, this plant cannot be considered as a hyperaccumulator species of these two REEs, since the obtained REE content in the plant's upper parts was less than 1000 mg·Kg DW.
稀土元素（REEs）是一组对植物生长发育非必需的金属元素。在高浓度时，它们会引发植物内部压力并扰乱植物的生理生化机制。评估了园艺植物对镧（La）和铈（Ce）的潜在吸收以及这些元素对其生长、大量元素吸收以及酚类化合物和黄酮类化合物含量的影响。将植物暴露于0、1、2.5、5和10 µM的La和Ce中14天。结果表明这两种稀土元素有显著积累，尤其是在根部，且发现其与植物地上部分和根部的总酚类化合物及黄酮类化合物含量呈正相关。植物的生长参数模式（如干重和含水量）、钾、钙和镁的含量以及耐受指数随所研究的两种元素浓度而变化。根据耐受指数值，[植物名称]对La的亲和力比对Ce的亲和力更强。尽管这些金属在[植物名称]组织中积累，但该植物不能被视为这两种稀土元素的超积累物种，因为在植物地上部分获得的稀土元素含量低于1000 mg·Kg DW。
