Effect of enhanced UV-B radiation on photosynthetic characteristics of marine microalgae Dunaliella salina (Chlorophyta, Chlorophyceae)

Zhang, Xinxin; Tang, Xuexi; Zhou, Bin; Hu, Shunxin; Wang, You

doi:10.1016/j.jembe.2015.04.002

Cited by 45 publications

(24 citation statements)

References 43 publications

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“…When higher plants and marine macroalgae are exposed to diurnal changes in PAR irradiances resulted in an interaction between non‐photochemical processes (e.g., the xanthophyll cycle) and the photodamage of PSII (Zhang et al. ,b, Kohlmeier et al. ).…”

Section: Discussionmentioning

confidence: 99%

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Interaction of Photoprotective and Acclimation Mechanisms in Ulva rigida (Chlorophyta) in Response to Diurnal Changes in Solar Radiation in Southern Chile

Cruces

Rautenberger

Cubillos

et al. 2019

Journal of Phycology

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Species of the genus Ulva (Chlorophyta) are regarded as opportunistic organisms, which efficiently adjust their metabolism to the prevailing environmental conditions. In this study, changes in chlorophyll‐a fluorescence‐based photoinhibition of photosynthesis, electron transport rates, photosynthetic pigments, lipid peroxidation, total phenolic compounds, and antioxidant metabolism were investigated during a diurnal cycle of natural solar radiation in summer (for 12 h) under two treatments: photosynthetically active radiation (PAR: 400–700 nm) and PAR+ ultraviolet (UV) radiation (280–700 nm). In the presence of PAR alone, Ulva rigida showed dynamic photoinhibition, and photosynthetic parameters and pigment concentrations decreased with the intensification of the radiation. On the other hand, under PAR+UV conditions a substantial decline up to 43% was detected and an incomplete fluorescence recovery, also, P‐I curve values remained low in relation to the initial condition. The phenolic compounds increased their concentration only in UV radiation treatments without showing a correlation with the antioxidant activity. The enzimatic activity of superoxide dismutase (SOD) and ascorbate peroxidase (APX) increased over 2‐fold respect at initial values during the onset of light intensity. In contrast, catalase (CAT) increased its activity rapidly in response to the radiation stress to reach maxima at 10 a.m. and decreasing during solar. The present study suggests that U. rigida is capable of acclimating to natural radiation stress relies on a concerted action of various physiological mechanisms that act at different times of the day and under different levels of environmental stress.

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Section: Discussionmentioning

confidence: 99%

“…, Zhang et al. ,b). In contrast to red and brown macroalgae, which have a certain UV‐screening capacity by mycosporine‐like amino acids (MAAs) and phlorotannins (Huovinen et al.…”

mentioning

confidence: 99%

Interaction of Photoprotective and Acclimation Mechanisms in Ulva rigida (Chlorophyta) in Response to Diurnal Changes in Solar Radiation in Southern Chile

Cruces

Rautenberger

Cubillos

et al. 2019

Journal of Phycology

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“…The damage of RBCL can inhibit its translation, through the exposure of its Nterminal regions, a known inhibitor of rbcL translation, after the disassembly of RuBisCO holoenzyme [41]. However, low intensity UV-B or UV-C exposure can enhance RuBisCO activity as in D. salina [42] and cyanobacteria [43], respectively. In Chlamydomonas, UV-C radiation depleted RuBisCO small subunit isoform 1 (RBCS1), while isoform 2 (RBCS2) abundance was not affected (Additional le 1: Table S2).…”

Section: Low Intensity Uv-c Irradiation Modulated Thylakoid Electron mentioning

confidence: 99%

“…6, Additional le 1: Table S2, S3). RuBisCO upregulation has been described under low UV-B in microalgae [42] and low UV-C in cyanobacteria [64]. While NDA5 and carbon xation can avoid the overreduction of the photosynthetic electron chain at chloroplast level, carbon export would act as a shuttle moving carbon and reducing power in the form of malate and glycerol to and from other cellular compartments [65,66], including the mitochondria, where they can contribute to generate ATP and avoid the overreduction associated to the inhibition of its electron transport chains.…”

Section: The Enhancement Of Nda5 Redox Modulator Under Uv-c Is Complementioning

confidence: 99%

Low UV-C stress modulates Chlamydomonas reinhardtii biomass composition and oxidative stress response through proteomic and metabolomic changes involving novel signalers and effectors

Colina

Carbó

Meijón

et al. 2020

Preprint

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Background: The exposition of microalgae and plants to low UV-C radiation dosages can improve their biomass composition and stress tolerance. Despite UV-C shares these effects with UV-A/B but at much lower dosages, UV-C sensing and signal mechanisms are still mostly unknown. Thus, we have described and integrated the proteometabolomic and physiological changes occurring in Chlamydomonas reinhardtii –a simple Plantae model– into the first 24 h after a short and low intensity UV-C irradiation in order to reconstruct the microalgae response system to this stress. Results : The microalgae response was characterized by increased redox homeostasis, ROS scavenging and protein damage repair/avoidance elements. These processes were upregulated along others related to the modulation of photosynthetic electron flux, carbon fixation and C/N metabolism. These changes, attributed to either direct UV-C-, ROS- or redox unbalances-associated damage, trigger a response process involving novel signaling intermediaries and effectors as the translation modulator FAP204, a PP2A like protein and a novel DYRK kinase. These elements were found linked to the modulation of Chlamydomonas biomass composition (starch accumulation) and proliferation, within an UV-C response probably modulated by different epigenetic factors.Conclusion: Chosen multiomics integration approach was able to describe many fast changes, including biomass composition and ROS stress tolerance, as a response to a low intensity UV-C stress. Moreover, the employed omics and systems biology approach placed many previously unidentified protein and metabolites at the center of these changes. These elements would be promising targets for the characterization of this stress response in microalgae and plants and the engineering of more productive microalgae strains.

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“…The other cultivating conditions were the same as above described without other description. The microalgal cultivation was performed according to the method of Zhao et al 2017, and the raw material was treated and sterilized according to the procedure of Zhang et al (2015).…”

Section: Organism Collection and Cultivation Of Two Species Of Marinementioning

confidence: 99%

Alteration of Feeding and Filtering Rates of Two Species of Marine Copepods Exposed to Different pH Levels

Wang¹,

Wang²,

Xue³

et al. 2019

AST

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Impacts of different pH levels on different species of marine copepods, Calanoida copepod Schmackeria poplesia and Cyclopoida copepod Oithona similis were evaluated, and the alteration of key physiological processes of feeding and filtering were comparatively studies under controlled lab conditions. The optimal pH for O.similis and S.poplesia was 9.0 and 8.0 respectively, and they performed differently when exposed to different pH levels. For S. poplesia., the feeding and filtering rates increased steadily with the increment of pH at the range of 6.0~8.0, and reached the peak at pH 8.0. However, the rates decreased when pH was above 9.0. O.similis seemed more adaptive to the change of pH, and the increment was found in feeding and filtering rates at a range of 6.0~8.0. The maximus appeared at pH 9.0. compared to the other pH levels, the acidifying level of pH 6.0 presented the most obviously inhibition on feeding and filtering. Results in the present study would shed light on establishing the optimum culturing conditions for the cultivation of marine copepod.

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Effect of enhanced UV-B radiation on photosynthetic characteristics of marine microalgae Dunaliella salina (Chlorophyta, Chlorophyceae)

Cited by 45 publications

References 43 publications

Interaction of Photoprotective and Acclimation Mechanisms in Ulva rigida (Chlorophyta) in Response to Diurnal Changes in Solar Radiation in Southern Chile

Interaction of Photoprotective and Acclimation Mechanisms in Ulva rigida (Chlorophyta) in Response to Diurnal Changes in Solar Radiation in Southern Chile

Low UV-C stress modulates Chlamydomonas reinhardtii biomass composition and oxidative stress response through proteomic and metabolomic changes involving novel signalers and effectors

Alteration of Feeding and Filtering Rates of Two Species of Marine Copepods Exposed to Different pH Levels

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