Detrimental effect of UV-B radiation on growth, photosynthetic pigments, metabolites and ultrastructure of some cyanobacteria and freshwater chlorophyta

El‐Sheekh, Mostafa M.; Alwaleed, Eman A.; Ibrahim, Aml; Saber, Hani

doi:10.1080/09553002.2021.1851060

Cited by 15 publications

(6 citation statements)

References 56 publications

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“…Carbohydrate contents decreased slightly under UVA and UVB treatments, that was because UVR caused damage to thylakoids of the chloroplast, and the generation of free radicals led to a content decrease (A ́lvarez Goḿez et al, 2019). With respect to protein content, UVB significantly promoted its accumulation, which was in accordance with the results in Porphyra haitanensis (Otogo et al, 2021), Scenedesmus acutus (Fu et al, 2021) and Microcystis flos-aquae (El-Sheekh et al, 2021), resulting from protein damage and the cellular demands required to maintain homeostasis and photosynthetic processes. On the other hand, UV radiation-induced protein accumulation protected algae from UVR-promoted peroxidative processes.…”

Section: Discussionsupporting

confidence: 88%

Effects of seawater acidification and solar ultraviolet radiation on photosynthetic performances and biochemical compositions of Rhodosorus sp. SCSIO-45730

Wang

Yang

et al. 2022

Front. Mar. Sci.

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Ocean acidification (OA) caused by rising atmospheric CO2 concentration and solar ultraviolet radiation (UVR) resulting from ozone depletion may affect marine organisms, but little is known regarding how unicellular Rhodosorus sp. SCSIO-45730, an excellent species resource containing various biological-active compounds, responds to OA and UVR. Therefore, we conducted a factorial coupling experiment to unravel the combined effects of OA and UVR on the growth, photosynthetic performances, biochemical compositions and enzyme activities of Rhodosorus sp. SCSIO-45730, which were exposed to two levels of CO2 (LC, 400 μatm, current CO2 level; HC, 1000 μatm, future CO2 level) and three levels of UVR (photosynthetically active radiation (PAR), PAR plus UVA, PAR plus UVB) treatments in all combinations, respectively. Compared to LC treatment, HC stimulated the relative growth rate (RGR) due to higher optimum and effective quantum yields, photosynthetic efficiency, maximum electron transport rates and photosynthetic pigments contents regardless of UVR. However, the presence of UVA had no significant effect but UVB markedly reduced the RGR. Additionally, higher carbohydrate content and lower protein and lipid contents were observed when Rhodosorus sp. SCSIO-45730 was cultured under HC due to the ample HCO3− applications and active stimulation of metabolic enzymes of carbonic anhydrase and nitrate reductase, thus resulting in higher TC/TN. OA also triggered the production of reactive oxygen species (ROS), and the increase of ROS coincided approximately with superoxide dismutase and catalase activities, as well as phenols contents. However, UVR induced photochemical inhibition and damaged macromolecules, making algal cells need more energy for self-protection. Generally, these results revealed that OA counteracted UVR-related inhibition on Rhodosorus sp. SCSIO-45730, adding our understanding of the red algae responding to future global climate changes.

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Section: Discussionsupporting

confidence: 88%

Effects of seawater acidification and solar ultraviolet radiation on photosynthetic performances and biochemical compositions of Rhodosorus sp. SCSIO-45730

Wang

Yang

et al. 2022

Front. Mar. Sci.

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“…The increase in the protein of the UV-exposed microalgae in this study correlates with the report of Kumar et al ( 2018 ), who observed a 23% protein content for C. sorokiniana after exposure to UV radiation. Similarly, El-Sheekh et al ( 2021 ) reported a twofold increase in the protein content of Microcystis after UV exposure. In addition, Colina et al ( 2020 ) reported that the exposure of microalgae to UV radiation elevates microalgae adaptive mechanisms and the accumulation of biomolecules such as lipids, proteins, chlorophyll, and carbohydrates associated with the defensive mechanism.…”

Section: Resultsmentioning

confidence: 80%

“…It has been reported that Chl a, Chl b and carotenoid are the principal photosynthetic biomolecular apparatus in microalgae that captures light energy and CO 2 . These photosynthetic apparatuses are also UV filters to protect the photosystems from the damaging effects of UV light radiation (El-Sheekh et al 2021 ). A similar increase in chlorophyll contents by Chlorella sp and Chlamydomonas reinhardtii was reported by Liu et al ( 2015 ) after their exposure to UV radiation.…”

Section: Resultsmentioning

confidence: 99%

“…vacuolatus (1:40). UV radiation has been used to positively bioengineer microorganisms to improved cellular biomolecules such carbohydrate and lipid (Ganapathy et al 2017 ; Tenorio et al 2022 ; El-Sheekh et al 2021 ). The UV radiation in the present study favoured protein synthesis and accumulation and subsequently enhanced the S. vacuolatus enzymatic and metabolic activities.…”

Section: Resultsmentioning

confidence: 99%

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Effect of ultra-violet light radiation on Scenedesmus vacuolatus growth kinetics, metabolic performance, and preliminary biodegradation study

et al. 2023

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This study presents the effect of ultra-violet (UV) light radiation on the process kinetics, metabolic performance, and biodegradation capability of Scenedesmus vacuolatus. The impact of the UV radiation on S. vacuolatus morphology, chlorophyll, carotenoid, carbohydrates, proteins, lipid accumulation, growth rate, substrate affinity and substrate versatility were evaluated. Thereafter, a preliminary biodegradative potential of UV-exposed S. vacuolatus on spent coolant waste (SCW) was carried out based on dehydrogenase activity (DHA) and total petroleum hydrocarbon degradation (TPH). Pronounced structural changes were observed in S. vacuolatus exposed to UV radiation for 24 h compared to the 2, 4, 6, 12 and 48 h UV exposure. Exposure of S. vacuolatus to UV radiation improved cellular chlorophyll (chla = 1.89-fold, chlb = 2.02-fold), carotenoid (1.24-fold), carbohydrates (4.62-fold), proteins (1.44-fold) and lipid accumulations (1.40-fold). In addition, the 24 h UV exposed S. vacuolatus showed a significant increase in substrate affinity (1/Ks) (0.959), specific growth rate (µ) (0.024 h−1) and biomass accumulation (0.513 g/L) by 1.50, 2 and 1.9-fold respectively. Moreover, enhanced DHA (55%) and TPH (100%) degradation efficiency were observed in UV-exposed S. vacuolatus. These findings provided major insights into the use of UV radiation to enhance S. vacuolatus biodegradative performance towards sustainable green environment negating the use of expensive chemicals and other unfriendly environmental practices. Graphical abstract

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“…Increasing temperature may stimulate the development of cyanobacterial blooms by prolonging the growing season, increasing stability of water column and enhancing the growth rates ( Visser et al, 2016 ; Wang et al, 2020 ; Ma and Wang, 2021 ). UV radiation usually has negative effects on photosynthesis and growth of cyanobacteria ( Rastogi et al, 2014 ; El-Sheekh et al, 2021 ). Freshwater ecosystems, particularly in low and mid latitudes, are more likely to be influenced by alterations in UV radiation, as global warming and release of trace gases may reduce the barrier properties of the ozone layer ( Williamson et al, 2019 ).…”

Section: Introductionmentioning

confidence: 99%

UV radiation and temperature increase alter the PSII function and defense mechanisms in a bloom-forming cyanobacterium Microcystis aeruginosa

Yan,

Li,

Zang

et al. 2024

Front. Microbiol.

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The aim was to determine the response of a bloom-forming Microcystis aeruginosa to climatic changes. Cultures of M. aeruginosa FACHB 905 were grown at two temperatures (25°C, 30°C) and exposed to high photosynthetically active radiation (PAR: 400–700 nm) alone or combined with UVR (PAR + UVR: 295–700 nm) for specified times. It was found that increased temperature enhanced M. aeruginosa sensitivity to both PAR and PAR + UVR as shown by reduced PSII quantum yields (Fv/Fm) in comparison with that at growth temperature (25°C), the presence of UVR significantly exacerbated the photoinhibition. M. aeruginosa cells grown at high temperature exhibited lower PSII repair rate (Krec) and sustained nonphotochemical quenching (NPQs) induction during the radiation exposure, particularly for PAR + UVR. Although high temperature alone or worked with UVR induced higher SOD and CAT activity and promoted the removal rate of PsbA, it seemed not enough to prevent the damage effect from them showing by the increased value of photoinactivation rate constant (Kpi). In addition, the energetic cost of microcystin synthesis at high temperature probably led to reduced materials and energy available for PsbA turnover, thus may partly account for the lower Krec and the declination of photosynthetic activity in cells following PAR and PAR + UVR exposure. Our findings suggest that increased temperature modulates the sensitivity of M. aeruginosa to UVR by affecting the PSII repair and defense capacity, thus influencing competitiveness and abundance in the future water environment.

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Detrimental effect of UV-B radiation on growth, photosynthetic pigments, metabolites and ultrastructure of some cyanobacteria and freshwater chlorophyta

Cited by 15 publications

References 56 publications

Effects of seawater acidification and solar ultraviolet radiation on photosynthetic performances and biochemical compositions of Rhodosorus sp. SCSIO-45730

Effects of seawater acidification and solar ultraviolet radiation on photosynthetic performances and biochemical compositions of Rhodosorus sp. SCSIO-45730

Effect of ultra-violet light radiation on Scenedesmus vacuolatus growth kinetics, metabolic performance, and preliminary biodegradation study

UV radiation and temperature increase alter the PSII function and defense mechanisms in a bloom-forming cyanobacterium Microcystis aeruginosa

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