Department of Biology, Federal University of Lavras, CP 3037, 37200-000, Lavras, Minas Gerais, Brazil.
Department of Biology, Federal University of Lavras, CP 3037, 37200-000, Lavras, Minas Gerais, Brazil.
Ecotoxicol Environ Saf. 2020 Apr 15;193:110336. doi: 10.1016/j.ecoenv.2020.110336. Epub 2020 Feb 21.
Aquatic environments contaminated by lead (Pb) are a problem in many regions of world. Since Pb has high toxicity, the identification of species for phytoremediation is important for the recovery of these areas. Thus, the phytoremediation potential of Panicum aquaticum Poir. (Poaceae) was evaluated. The anatomical and physiological responses of P. aquaticum were assessed under different concentrations of Pb [0.0, 0.5, 1.0, 2.0, 4.0, and 8.0 mM of Pb(NO)]. Plant growth, anatomy of roots and leaves, root uptake, root to shoot translocation, and the concentration and accumulation of Pb in organs were analyzed. Regarding leaf anatomy, Pb treatment led to changes in epidermis thickness, stomatal density, stomatal diameter, and sclerenchymal area. Endoderm thickness was increased at the highest concentrations of Pb, which may be related to reduced translocation and shoot accumulation. The roots of P. aquaticum presented increased absorption (2279 μg g DW of Pb). In conclusion, P. aquaticum was found to have potential for the phytoremediation of areas contaminated with Pb.
受铅（Pb）污染的水生环境是世界许多地区的一个问题。由于 Pb 具有高毒性，因此对于这些地区的恢复，识别具有植物修复潜力的物种非常重要。因此，评估了 Poir.（禾本科）的植物修复潜力。在不同浓度的 Pb [0.0、0.5、1.0、2.0、4.0 和 8.0 mM 的 Pb(NO)]下，评估了 P. aquaticum 的解剖和生理反应。分析了植物生长、根和叶的解剖结构、根系吸收、根到茎的转运以及器官中 Pb 的浓度和积累。关于叶片解剖结构，Pb 处理导致表皮厚度、气孔密度、气孔直径和厚壁组织面积的变化。在 Pb 的最高浓度下，内皮层厚度增加，这可能与减少转运和茎积累有关。P. aquaticum 的根表现出增强的吸收（Pb 的 2279μg g DW）。总之，发现 P. aquaticum 具有修复 Pb 污染地区的潜力。
