Biological weighting functions as a tool for evaluating two ways to measure UVB radiation inhibition on photosynthesis

Andreasson, Kristin I.M.; Wängberg, Sten-Åke

doi:10.1016/j.jphotobiol.2006.02.004

Cited by 20 publications

(20 citation statements)

References 28 publications

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“…Normalization allowed comparison between wavelength responses of the different processes and previously published 300 nm normalized BWFs (Cullen et al, 1992;Neale et al, 1998;Neale & Kieber, 2000;Villafan˜e et al 2003;Andreasson & Wangberg, 2006). The normalized BWFs for both LL cultures were remarkably similar.…”

Section: Resultsmentioning

confidence: 72%

“…BWFs obtained under solar radiation are preferred over those using artificial irradiance conditions (Sobrino et al, 2005;Andreasson & Wangberg, 2006), since UVR effects are the net result of damage and repair, or protective processes that are influenced by different wavelength regions, including PAR. On the other hand, natural irradiance exposure might cause problems due to shortterm irradiance variability resulting from passing clouds such as occurring in our experiments on the 24th of January.…”

Section: Discussionmentioning

confidence: 99%

“…Until recently, BWFs based on inhibition of carbon assimilation showed variability due to species specificity, habitat origin, nutrient status or irradiance history (Cullen et al, 1992;Boucher & Prezelin, 1996;Neale et al, 1998;Litchman et al 2002;Villafan˜e et al, 2004). Andreasson & Wangberg (2006) compared BWFs (<360 nm) of PSII quantum yield and inhibition of carbon assimilation in three microalgal species. This study showed differences in UVBR responses for both parameters, with a lower sensitivity for PSII photochemical quantum yield as compared with carbon assimilation (Andreasson & Wangberg, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Andreasson & Wangberg (2006) compared BWFs (<360 nm) of PSII quantum yield and inhibition of carbon assimilation in three microalgal species. This study showed differences in UVBR responses for both parameters, with a lower sensitivity for PSII photochemical quantum yield as compared with carbon assimilation (Andreasson & Wangberg, 2006). In addition, Sobrino et al (2005) presented a BWF for xanthophyll de-epoxidation in the marine picoplankter Nannochloropsis gaditana, demonstrating enhanced de-epoxidation in the UVR region.…”

Section: Introductionmentioning

confidence: 99%

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Wavelength-dependent xanthophyll cycle activity in marine microalgae exposed to natural ultraviolet radiation

Buma

Visser

Poll

et al. 2009

European Journal of Phycology

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The wavelength dependency of xanthophyll cycling in two marine microalgae (Thalassiosira weissflogii and Dunaliella tertiolecta) was studied by establishing biological weighting functions (BWFs) during exposure to natural ultraviolet radiation. High-(HL) and low-(LL) light-acclimated cultures of both species were exposed outdoors for up to 60 min under a series of UVR (280-400 nm) cut-off filters, after which the de-epoxidation state of xanthophyll cycle pigments, radiocarbon assimilation and photochemical quantum yield were measured. Exposures were repeated 4-8 times during the daily cycle to create exposure-response curves for each wavelength condition. UVR affected the three target processes significantly in both species and biological weights increased with decreasing wavelength, particularly in the UVBR region (280-315 nm). Minor wavelength dependency was observed between 315 and 360 nm. After BWF normalization to 300 nm, the LL cultures showed highly similar responses when comparing the three target processes, while the BWFs for the HL cultures differed significantly. The observed enhanced xanthophyll cycling activity in the UVR region implied that xanthophylls had an active role in diminishing UVR stress. However, this enhancement seems to be an indirect effect of damage within the dark reactions of photosynthesis. Hence, another vital target process further downstream in the photosynthetic process, possibly involved in the dark reactions, seems to be responsible for the high similarity in BWFs.

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Section: Resultsmentioning

confidence: 72%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Wavelength-dependent xanthophyll cycle activity in marine microalgae exposed to natural ultraviolet radiation

Buma

Visser

Poll

et al. 2009

European Journal of Phycology

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“…When applying a BWF for inhibition of photosynthesis obtained from the phycobilin containing cryptophyte Rhodomonas sp. the UV-B enhancement level was 50% compared with the unweighted intensity (Andreasson and Wängberg, 2006). Therefore, our UV-B intensity was equivalent to ca.…”

Section: Experimental Design and Light Conditionsmentioning

confidence: 84%

Intraspecific variation in the response of the cyanobacterium Nodularia spumigena to moderate UV-B radiation

Wulff¹,

Mohlin²,

Sundbäck³

2007

Harmful Algae

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Interactive effects of global climate change and pollution on marine microbes: the way ahead

Coelho

Santos

Coimbra

et al. 2013

Ecology and Evolution

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Global climate change has the potential to seriously and adversely affect marine ecosystem functioning. Numerous experimental and modeling studies have demonstrated how predicted ocean acidification and increased ultraviolet radiation (UVR) can affect marine microbes. However, researchers have largely ignored interactions between ocean acidification, increased UVR and anthropogenic pollutants in marine environments. Such interactions can alter chemical speciation and the bioavailability of several organic and inorganic pollutants with potentially deleterious effects, such as modifying microbial-mediated detoxification processes. Microbes mediate major biogeochemical cycles, providing fundamental ecosystems services such as environmental detoxification and recovery. It is, therefore, important that we understand how predicted changes to oceanic pH, UVR, and temperature will affect microbial pollutant detoxification processes in marine ecosystems. The intrinsic characteristics of microbes, such as their short generation time, small size, and functional role in biogeochemical cycles combined with recent advances in molecular techniques (e.g., metagenomics and metatranscriptomics) make microbes excellent models to evaluate the consequences of various climate change scenarios on detoxification processes in marine ecosystems. In this review, we highlight the importance of microbial microcosm experiments, coupled with high-resolution molecular biology techniques, to provide a critical experimental framework to start understanding how climate change, anthropogenic pollution, and microbiological interactions may affect marine ecosystems in the future.

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Biological weighting functions as a tool for evaluating two ways to measure UVB radiation inhibition on photosynthesis

Cited by 20 publications

References 28 publications

Wavelength-dependent xanthophyll cycle activity in marine microalgae exposed to natural ultraviolet radiation

Wavelength-dependent xanthophyll cycle activity in marine microalgae exposed to natural ultraviolet radiation

Intraspecific variation in the response of the cyanobacterium Nodularia spumigena to moderate UV-B radiation

Interactive effects of global climate change and pollution on marine microbes: the way ahead

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