Non enzymatic antioxidant photoprotection against potential UVBR induced damage in an Antarctic diatom (Thalassiosira sp.)

Hernando, Marcelo Pablo; Malanga, Gabriela; Puntarulo, Susana; Ferreyra, Gustavo A.

doi:10.3856/vol39-issue3-fulltext-1

Cited by 10 publications

(6 citation statements)

References 50 publications

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“…In the diatom Thalassiosira sp., isolated from natural phytoplankton assemblages from Potter Cove (Antarctic Peninsula) α-tocopherol showed a marked decrease during the exponential growth phase after exposure to solar UV-R, while the initial content of β-carotene did not show significant differences over time [ 312 ]. In addition, MAA production increased, suggesting that for this species photoprotection against UV-induced damage is characterized by short-term consumption of α-tocopherol and longer-term synthesis of MAAs.…”

Section: Uv Photoprotection In Marine Organisms: Antarctic and Nonmentioning

confidence: 99%

UV-Protective Compounds in Marine Organisms from the Southern Ocean

et al. 2018

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Solar radiation represents a key abiotic factor in the evolution of life in the oceans. In general, marine, biota—particularly in euphotic and dysphotic zones—depends directly or indirectly on light, but ultraviolet radiation (UV-R) can damage vital molecular machineries. UV-R induces the formation of reactive oxygen species (ROS) and impairs intracellular structures and enzymatic reactions. It can also affect organismal physiologies and eventually alter trophic chains at the ecosystem level. In Antarctica, physical drivers, such as sunlight, sea-ice, seasonality and low temperature are particularly influencing as compared to other regions. The springtime ozone depletion over the Southern Ocean makes organisms be more vulnerable to UV-R. Nonetheless, Antarctic species seem to possess analogous UV photoprotection and repair mechanisms as those found in organisms from other latitudes. The lack of data on species-specific responses towards increased UV-B still limits the understanding about the ecological impact and the tolerance levels related to ozone depletion in this region. The photobiology of Antarctic biota is largely unknown, in spite of representing a highly promising reservoir in the discovery of novel cosmeceutical products. This review compiles the most relevant information on photoprotection and UV-repair processes described in organisms from the Southern Ocean, in the context of this unique marine polar environment.

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Section: Uv Photoprotection In Marine Organisms: Antarctic and Nonmentioning

confidence: 99%

UV-Protective Compounds in Marine Organisms from the Southern Ocean

et al. 2018

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“…Hernando et al [47] showed that photoprotection against UV-induced damage is characterized by short-term consumption of -T and long-term synthesis of mycosporine-like amino acids (MAAs) in an Antarctic diatom Thalassiosira sp. The UV-B damage/repair ratio during long-term exposure involves the combined action of several endogenous factors within the cell, with MAAs synthesis being the most effective factor.…”

Section: Uv Radiation (Uv-r) Exposurementioning

confidence: 99%

Cellular Oxidant/Antioxidant Network: Update on the Environmental Effects Over Marine Organisms

González¹,

Malanga²,

Puntarulo³

2015

TOMBJ

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Aquatic organisms are exposed and adjust to a wide variety of environmental challenges including natural and anthropogenic factors. Natural sources are understood the effects of temperature, and saline fluctuations, oxygen availability, the relative abundance of chemical elements and pathogenic invasion. On the contrary, anthropogenic factors are considered the availability of heavy metals, the presence of hydrocarbons, industrial and urban wastes, and pesticides. Moreover, these organisms suffer, in order to maintain homeostasis, growth and reproduction, the effect of temporal and spatial variations. All the environmental changes (natural and non-natural) may cause a different degree of stress in aquatic organisms, via induction of disbalance between the generation and elimination of reactive oxygen species and reactive nitrosative species. A brief summary on the actual knowledge on the establishment, by environmental effects, of oxidative/nitrosative stress and the effect on the antioxidant system in marine organisms, is presented in this review to contribute to the deeper understanding of the complexity of the metabolic and physiological changes that aquatic organisms are constantly suffering.

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“…Therefore, the attenuation of UVBR in the mesocosms cannot explain the lack of observed UVBR effects during our study. Hernando et al (2002Hernando et al ( , 2011 found that the phytoplankton community produced photoprotective pigments such as mycosporine-like amino acids (MAAs) or antioxidants prior to their UVBR exposure experiments. This allowed the community to reduce the negative effects of UVBR.…”

Section: Uvbr Effects On the Beagle Channel Microbial Communitymentioning

confidence: 99%

Effects of enhanced temperature and ultraviolet B radiation on a natural plankton community of the Beagle Channel (southern Argentina): a mesocosm study

Moreau¹,

Mostajir²,

Almandoz³

et al. 2014

Aquat. Microb. Ecol.

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Marine planktonic communities can be affected by increased temperatures associated with global climate change, as well as by increased ultraviolet B radiation (UVBR, 280− 320 nm) through stratospheric ozone layer thinning. We studied individual and combined effects of increased temperature and UVBR on the plankton community of the Beagle Channel, southern Patagonia, Argentina. Eight 2 m 3 mesocosms were exposed to 4 treatments (with 2 replicates) during 10 d: (1) control (natural temperature and UVBR), (2) increased UVBR (simulating a 60% decrease in stratospheric ozone layer thickness), (3) increased temperature (+ 3°C), and (4) simultaneous increased temperature and UVBR (60% decrease in stratospheric ozone; + 3°C). Two distinct situations were observed with regard to phytoplankton biomass: bloom (Days 1−4) and postbloom (Days 5−9). Significant decreases in micro-sized diatoms (> 20 µm), bacteria, chlorophyll a, and particulate organic carbon concentrations were observed during the post-bloom in the enhanced temperature treatments relative to natural temperature, accompanied by significant increases in nanophytoplankton (10−20 µm, mainly prymnesiophytes). The decrease in microsized diatoms in the high temperature treatment may have been caused by a physiological effect of warming, although we do not have activity measurements to support this hypothesis. Prymnesiophytes benefited from micro-sized diatom reduction in their competition for resources. The bacterial decrease under warming may have been due to a change in the dissolved organic matter release caused by the observed change in phytoplankton composition. Overall, the rise in temperature affected the structure and total biomass of the communities, while no major effect of UVBR was observed on the plankton community. KEY WORDS: Plankton · UVBR · Ozone hole · Increased temperature · PatagoniaResale or republication not permitted without written consent of the publisher Aquat Microb Ecol 72: 155-173, 2014

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Non enzymatic antioxidant photoprotection against potential UVBR induced damage in an Antarctic diatom (Thalassiosira sp.)

Cited by 10 publications

References 50 publications

UV-Protective Compounds in Marine Organisms from the Southern Ocean

UV-Protective Compounds in Marine Organisms from the Southern Ocean

Cellular Oxidant/Antioxidant Network: Update on the Environmental Effects Over Marine Organisms

Effects of enhanced temperature and ultraviolet B radiation on a natural plankton community of the Beagle Channel (southern Argentina): a mesocosm study

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