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Effect of temperature on microcystin-LR removal and lysis activity on Microcystis aeruginosa (cyanobacteria) by an indigenous bacterium belonging to the genus Achromobacter

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Abstract

Microcystis is a frequent cyanobacterium bloom-forming with cosmopolitan distribution which can produce a hepatotoxin group called microcystins (MCs). These MCs are resistant to the traditional processes employed in the water treatment plants and they are often detected after conventional treatments. Because of this, the bio-removal studies have obtained a great interest in the last decades. In this work, a bacterial strain namely LG1 with the ability to remove microcystin-LR (MC-LR) under laboratory conditions was isolated from Rio de la Plata River and it was identified as Achromobacter spp. This ubiquitous bacterium was able to remove 79.5% MC-LR in 7 days with average removal time of 3.33 ± 0.08, 3.06 ± 0.05, and 2.77 ± 0.05 days at 28, 32, and 36 ± 1 °C, being higher at high temperature (36 °C) with an activation energy = 16.79 ± 1.99 kJ mol−1. LG1 grew better at higher temperature (from 28 to 36 ± 1 °C) increasing the specific growth rate (μ) and reducing 2-fold the lag phase duration (LPD) without significant differences (p > 0.05) between maximum population density (MPD). In addition, LG1 showed a lysis activity on two M. aeruginosa native strains in 7 days measured as chlorophyll a (Chl-a) concentration. The lysis activity increased around 2-fold when increasing the temperature from 28 to 36 ± 1 °C. This is the first report of an indigenous bacterium belonging to the genus Achromobacter spp. isolated from the Rio de la Plata River with the capacity to remove MC-LR and lysis activity on M. aeruginosa.

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Funding

This study was financially supported by the University National of La Plata (UNLP X526), National Agency of Scientific and Technical Research (PICT0861-2013), and CONICET(PIP0959).

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Authors and Affiliations

  1. Laboratorio de Toxicología General, Facultad de Ciencias Exactas, UNLP, La Plata, Argentina

    Melina Crettaz-Minaglia, Maximiliano Fallico, Oswaldo Aranda & Dario Andrinolo

  2. CONICET, Buenos Aires, Argentina

    Melina Crettaz-Minaglia, Ivan Juarez, Dario Andrinolo & Leda Giannuzzi

  3. Centro de Investigaciones y Desarrollo en Criotecnología de Alimentos, UNLP-CONICET, La Plata, Argentina

    Ivan Juarez & Leda Giannuzzi

  4. Departamento de Radiobiología, Comisión Nacional de Energía Atómica, Buenos Aires, Argentina

    Magdalena Pezzoni & Cristina Costa

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  1. Melina Crettaz-Minaglia
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Highlights

• This work provides experimental data and mathematical modeling of the MC-LR removal and Microcystis aeruginosa lysis activity on two temperate strains by novel Achromobacter spp. isolated from Rio de La Plata River (Argentina).

• It provides data about bacterial growth parameters using Gompertz model. It also provides evidence of the possible environmental biotransformation of this cyanotoxin and bloom senescence.

• Its use as ex situ treatment must be deepened and scaled according to the best conditions assayed in the present work.

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Crettaz-Minaglia, M., Fallico, M., Aranda, O. et al. Effect of temperature on microcystin-LR removal and lysis activity on Microcystis aeruginosa (cyanobacteria) by an indigenous bacterium belonging to the genus Achromobacter. Environ Sci Pollut Res 27, 44427–44439 (2020). https://doi.org/10.1007/s11356-020-09901-y

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