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Volume 10
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10.3390/plants10112349
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Article

Periphytic Algae and Cyanobacteria from the Rio Doce Basin Respond Differently to Metals and Salinity, Showing Different Potential for Bioremediation

by
Marcelo Pedrosa Gomes
1,*,
Letícia Yoshie Kochi
1,
Patrícia Lawane Freitas
1,
Cleber Cunha Figueredo
2 and
Philippe Juneau
3,*
1
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
2
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
3
Ecotoxicology of Aquatic Microorganisms Laboratory, GRIL, EcotoQ, TOXEN, Department of Biological Sciences, Université du Québec à Montréal, Montréal, QC H3C 3P8, Canada
*
Authors to whom correspondence should be addressed.
Plants 2021, 10(11), 2349; https://doi.org/10.3390/plants10112349
Submission received: 2 October 2021 / Revised: 20 October 2021 / Accepted: 27 October 2021 / Published: 30 October 2021
(This article belongs to the Special Issue The Impact of Environmental Factors on Algae and Cyanobacteria)
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Abstract

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—Synechococcus elongatus (Cyanobacteria) and Chlorococcum infusionum (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−1, and 2.5 and 7.9 mg Mn L−1 for S. elongatus and 53.9 and 61.6 mg Fe L−1, and 53.2 and 60.9 mg Mn L−1 for C. infusionum. 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, C. infusionum presents greater resistance to Fe and Mn than S. elongatus. Under environmental realistic concentrations of Fe and Mn in river water from the Rio Doce Basin, S. elongatus and C. infusionum 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, S. elongatus and C. infusionum can be used for the remediation of waters contaminated with Fe and Mn.
Keywords: iron; manganese; sodium chloride; periphyton; stress iron; manganese; sodium chloride; periphyton; stress

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MDPI and ACS Style

Gomes, M.P.; Kochi, L.Y.; Freitas, P.L.; Figueredo, C.C.; Juneau, P. Periphytic Algae and Cyanobacteria from the Rio Doce Basin Respond Differently to Metals and Salinity, Showing Different Potential for Bioremediation. Plants 2021, 10, 2349. https://doi.org/10.3390/plants10112349

AMA Style

Gomes MP, Kochi LY, Freitas PL, Figueredo CC, Juneau P. Periphytic Algae and Cyanobacteria from the Rio Doce Basin Respond Differently to Metals and Salinity, Showing Different Potential for Bioremediation. Plants. 2021; 10(11):2349. https://doi.org/10.3390/plants10112349

Chicago/Turabian Style

Gomes, Marcelo Pedrosa, Letícia Yoshie Kochi, Patrícia Lawane Freitas, Cleber Cunha Figueredo, and Philippe Juneau. 2021. "Periphytic Algae and Cyanobacteria from the Rio Doce Basin Respond Differently to Metals and Salinity, Showing Different Potential for Bioremediation" Plants 10, no. 11: 2349. https://doi.org/10.3390/plants10112349

APA Style

Gomes, M. P., Kochi, L. Y., Freitas, P. L., Figueredo, C. C., & Juneau, P. (2021). Periphytic Algae and Cyanobacteria from the Rio Doce Basin Respond Differently to Metals and Salinity, Showing Different Potential for Bioremediation. Plants, 10(11), 2349. https://doi.org/10.3390/plants10112349

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