Physiological responses and toxin production of Microcystis aeruginosa in short-term exposure to solar UV radiation

The aim of this study was to evaluate the effects of short-term (hours) exposure to solar UV radiation (UVR, 280-400 nm) on the physiology of Microcystis aeruginosa. Three solar radiation treatments were implemented: (i) PAR (PAR, 400-700 nm), (ii) TUVA (PAR + UVAR, 315-700 nm) and (iii) TUVR (PAR +...

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Autores principales: Hernando, Marcelo Pablo, Crettaz Minaglia, Melina Celeste, Malanga, Gabriela Fabiana, Houghton, Christian, Andrinolo, Darío, Sedan, Daniela Yazmine, Rosso, Lorena, Giannuzzi, Leda
Formato: Articulo
Lenguaje:Inglés
Publicado: 2018
Materias:
Biología
Solar UV radiation
Microcystis aeruginosa
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/131393
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-131393
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Biología
Solar UV radiation
Microcystis aeruginosa
spellingShingle Biología
Solar UV radiation
Microcystis aeruginosa
Hernando, Marcelo Pablo
Crettaz Minaglia, Melina Celeste
Malanga, Gabriela Fabiana
Houghton, Christian
Andrinolo, Darío
Sedan, Daniela Yazmine
Rosso, Lorena
Giannuzzi, Leda
Physiological responses and toxin production of Microcystis aeruginosa in short-term exposure to solar UV radiation
topic_facet Biología
Solar UV radiation
Microcystis aeruginosa
description The aim of this study was to evaluate the effects of short-term (hours) exposure to solar UV radiation (UVR, 280-400 nm) on the physiology of Microcystis aeruginosa. Three solar radiation treatments were implemented: (i) PAR (PAR, 400-700 nm), (ii) TUVA (PAR + UVAR, 315-700 nm) and (iii) TUVR (PAR + UVAR + UVBR, 280-700 nm). Differential responses of antioxidant enzymes and the reactive oxygen species (ROS) production to UVR were observed. Antioxidant enzymes were more active at high UVR doses. However, different responses were observed depending on the exposure to UVAR or UVBR and the dose level. No effects were observed on the biomass, ROS production or increased activity of superoxide dismutase (SOD) and catalase (CAT) compared to the control when UVR + PAR doses were lower than 9875 kJ m-2. For intermediate doses, UVR + PAR doses between 9875 and 10 275 kJ m-2, oxidative stress increased while resistance was imparted through SOD and CAT in the cells exposed to UVAR. Despite the increased antioxidant activity, biomass decrease and photosynthesis inhibition were observed, but no effects were observed with added exposure to UVBR. At the highest doses (UVR + PAR higher than 10 275 kJ m-2), the solar UVR caused decreased photosynthesis and biomass with only activation of CAT by UVBR and SOD and CAT by UVAR. In addition, for such doses, a significant decrease of microcystins (MCs, measured as MC-LR equivalents) was observed as a consequence of UVAR. This study facilitates our understanding of the SOD and CAT protection according to UVAR and UVBR doses and cellular damage and reinforces the importance of UVR as an environmental stressor. In addition, our results support the hypothesized antioxidant function of MCs.
format Articulo
Articulo
author Hernando, Marcelo Pablo
Crettaz Minaglia, Melina Celeste
Malanga, Gabriela Fabiana
Houghton, Christian
Andrinolo, Darío
Sedan, Daniela Yazmine
Rosso, Lorena
Giannuzzi, Leda
author_facet Hernando, Marcelo Pablo
Crettaz Minaglia, Melina Celeste
Malanga, Gabriela Fabiana
Houghton, Christian
Andrinolo, Darío
Sedan, Daniela Yazmine
Rosso, Lorena
Giannuzzi, Leda
author_sort Hernando, Marcelo Pablo
title Physiological responses and toxin production of Microcystis aeruginosa in short-term exposure to solar UV radiation
title_short Physiological responses and toxin production of Microcystis aeruginosa in short-term exposure to solar UV radiation
title_full Physiological responses and toxin production of Microcystis aeruginosa in short-term exposure to solar UV radiation
title_fullStr Physiological responses and toxin production of Microcystis aeruginosa in short-term exposure to solar UV radiation
title_full_unstemmed Physiological responses and toxin production of Microcystis aeruginosa in short-term exposure to solar UV radiation
title_sort physiological responses and toxin production of microcystis aeruginosa in short-term exposure to solar uv radiation
publishDate 2018
url http://sedici.unlp.edu.ar/handle/10915/131393
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