Gomes Marcelo Pedrosa, Kochi Letícia Yoshie, Freitas Patrícia Lawane, Figueredo Cleber Cunha, Juneau Philippe
Laboratório de Fisiologia de Plantas sob Estresse, Departamento de Botânica, Setor de Ciências Biológicas, Universidade Federal do Paraná, Avenida Coronel Francisco H. dos Santos, 100, Centro Politécnico Jardim das Américas, C.P. 19031, Curitiba 81531-980, Brazil.
Departamento de Botânica, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerias, Avenida Antônio Carlos, 6627, Pampulha, C.P. 486, Belo Horizonte 31270-901, Brazil.
Plants (Basel). 2021 Oct 30;10(11):2349. doi: 10.3390/plants10112349.
We have studied the isolated and combined effects of metals (Fe and Mn) and NaCl the on growth, physiology, and metal-uptake capacity of two photosynthetic periphytic species- (Cyanobacteria) and (Chlorophyta)-isolated from an impacted area of the Rio Doce River (Brazil) after the Fundão dam collapse. The effective concentrations found to reduce 10 and 50% growth were 15.2 and 31.6 mg Fe L, and 2.5 and 7.9 mg Mn L for and 53.9 and 61.6 mg Fe L, and 53.2 and 60.9 mg Mn L for . Although the metal toxicity was related to oxidative stress, both species showed activation of antioxidant systems under phytotoxic concentrations of Fe and Mn. By binding large concentrations of metals on its cell surface and thus avoiding their entrance into the cells, presents greater resistance to Fe and Mn than . Under environmental realistic concentrations of Fe and Mn in river water from the Rio Doce Basin, and showed a metal removal efficiency of 42 and 65% and 53 and 79%, respectively after 96 h. These species were insensitive to increased NaCl concentrations which, in addition, did not disrupt the metal removal capacity of the species. Due to their salt and metal tolerance, and can be used for the remediation of waters contaminated with Fe and Mn.
我们研究了金属（铁和锰）以及氯化钠对两种光合周丛生物——蓝藻和绿藻（从巴西多西河受影响地区分离得到，该地区在丰当大坝坍塌后受到影响）的生长、生理和金属吸收能力的单独及联合影响。发现对[蓝藻]而言，使生长降低10%和50%的有效浓度分别为15.2和31.6毫克铁/升，以及2.5和7.9毫克锰/升；对[绿藻]而言，则分别为53.9和61.6毫克铁/升，以及53.2和60.9毫克锰/升。尽管金属毒性与氧化应激有关，但在铁和锰的植物毒性浓度下，两种生物都表现出抗氧化系统的激活。[蓝藻]通过在其细胞表面结合大量金属从而避免它们进入细胞，因此比[绿藻]对铁和锰具有更强的抗性。在多西河流域河水环境实际的铁和锰浓度下，96小时后，[蓝藻]和[绿藻]的金属去除效率分别为42%和65%，以及53%和79%。这些生物对氯化钠浓度的增加不敏感，此外，氯化钠浓度的增加也不会破坏这些生物的金属去除能力。由于它们对盐和金属的耐受性，[蓝藻]和[绿藻]可用于修复受铁和锰污染的水体。
