Department of Botany and Microbiology, Faculty of Science, Sohag University, Sohag, Egypt.
Department of Botany, Faculty of Science, Minia University, Minia, Egypt.
Int J Phytoremediation. 2020;22(10):986-999. doi: 10.1080/15226514.2020.1719031. Epub 2020 Feb 10.
The present study aimed to explore the tolerance potential of Cd, Pb and Cu and physiological alterations in two common tree species growing in Minia governorate (Egypt) namely: and and to investigate the leaf features [leaf area (LA) and specific leaf area (SLA)] associated with the phytoremediation process. The findings may be useful for future surveillance as preliminary reference values for levels of heavy metals in urban and industrial settings. The levels of cadmium, lead and Cupper in plant leaf were determined. The results showed that heavy metals could inhibit the growth of plants including LA and SLA. The water content (WC) and photosynthetic pigments of Eucalyptus and Ficus decreased with the increased concentration of metals. Contrary to chlorophylls (a) and (b), carotenoids and chlorophyll ratio (a/b) showed a significant increase with increasing metals concentration especially that of Cd and Cu. Proline content was relatively increased and soluble carbohydrate content decreased in plants with high metal accumulation. Eucalyptus showed better tolerance capacity for Cd, Pb and Cu when compared to Ficus. The ability of Eucalyptus to accumulate and tolerate metal stress makes this species a good candidate to recuperate heavy metals-contaminated conditions.
本研究旨在探索两种常见树种（埃及米尼亚省的 和 ）对 Cd、Pb 和 Cu 的耐受潜力和生理变化，并研究与植物修复过程相关的叶片特征（叶面积 [LA] 和比叶面积 [SLA]）。这些发现可能对未来的监测有用，可作为城市和工业环境中重金属水平的初步参考值。测定了植物叶片中镉、铅和铜的含量。结果表明，重金属会抑制植物的生长，包括 LA 和 SLA。随着金属浓度的增加，桉树和榕树叶的含水量（WC）和光合色素减少。与叶绿素（a）和（b）相反，类胡萝卜素和叶绿素比值（a/b）随着金属浓度的增加而显著增加，尤其是 Cd 和 Cu。脯氨酸含量相对增加，可溶性碳水化合物含量在高金属积累的植物中减少。与榕树叶相比，桉树对 Cd、Pb 和 Cu 的耐受能力更强。桉树积累和耐受金属胁迫的能力使其成为修复重金属污染环境的良好候选树种。
