Stress and Recovery Responses of Microcystis aeruginosa Exposed to Extreme Light for Different Durations

Senavirathna, Mudalige Don Hiranya Jayasanka; Muhetaer, Guligena; Huang, Yan; Aihemaiti, Bahaguri; Fujino, Takeshi

doi:10.1007/s11270-021-05175-3

Cited by 4 publications

(10 citation statements)

References 42 publications

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“…The planktonic and benthic habitat preferences can be considered the main differences between the two species. The physiological responses of the two species were also distinct from those of M. aeruginosa , which was subjected to the same extreme light conditions in our previous study (Senavirathna et al, 2021). In the previous experiment, M. aeruginosa exposed to high‐intensity light could maintain cells without any deterioration; however, cell deterioration of P. galeata and P. ambiguum were observed in this experiment.…”

Section: Discussionsupporting

confidence: 57%

“…Further research is required to investigate the recovery phases of these two species. Our previous study on high‐intensity light exposure and the recovery of M. aeruginosa revealed that M. aeruginosa could recover more aggressively when the stress is released (Senavirathna et al, 2021). Although the proliferation rates were comparatively low for P. galeata and P. ambiguum , visual observations in a preliminary study confirmed that both species could successfully regenerate when the stress is released (data not presented).…”

Section: Discussionmentioning

confidence: 99%

“…Water environments are experiencing the adverse effects of cyanobacterial contamination globally. Cyanobacterial contamination causes numerous problems in water environments, including the toxification of drinking water, unpleasant odors, loss of esthetic value, and destruction of ecosystems (Kim et al, 2019; Machado et al, 2017; Senavirathna et al, 2021). Among these impacts, the release of odorous compounds by cyanobacteria leads to an unpleasant odor in drinking water.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, when the air‐bubbling, mixing, and drawdown techniques are employed, high‐intensity light exposure should have a remarkable influence on their performance, besides the expected impacts. A previous study found that M. aeruginosa exposed to 850–900 μmol m −2 s −1 PAR could significantly change its growth and physiology in a short duration (Senavirathna et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

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Temporal variation of 2‐MIB and geosmin production by Pseudanabaena galeata and Phormidium ambiguum exposed to high‐intensity light

Senavirathna

Jayasekara

2023

Water Environment Research

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This study demonstrated the temporal variation of 2-methylisoborneol (2-MIB) and geosmin (GSM) production of two filamentous cyanobacteria species Pseudanabaena galeata (NIES-512; planktonic) and Phormidium ambiguum (NIES-2119; benthic) exposed to high light intensity (950-1000 μmol m À2 s À1 photosynthetically active radiation). The production of 2-MIB and GSM was quantified together with oxidative stress, chlorophyll content, and cellular protein content. The relative chlorophyll bleaching and cell degradations were compared through microscopic images. The 2-MIB production of P. galeata increased by over 42 ± 17% on the second day of exposure and remained leveled through the exposure period. P. ambiguum showed a continuous increase of 2-MIB until the 10th day, recording a 95 ± 4% increment. The GSM production was elevated until the fourth day of exposure by 46 ± 10% for P. galeata and by 74 ± 21% on the second day for P. ambiguum and reduced with prolonged exposure for both species. The chlorophyll content of P. galeata was reduced by 62 ± 7% on the second day, and that of P. ambiguum was reduced by 52 ± 9% on the fourth day and remained low. Protein and H 2 O 2 contents of both species were changed inconsistently. Exposure to high-intensity light can photobleach and deteriorate cells of both species, but elevations in odorous compounds can be expected.

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Section: Discussionsupporting

confidence: 57%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Temporal variation of 2‐MIB and geosmin production by Pseudanabaena galeata and Phormidium ambiguum exposed to high‐intensity light

Senavirathna

Jayasekara

2023

Water Environment Research

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“…The lowest intensity, 50 μmol m −2 s −1 , considered suitable for the growth of M. aeruginosa , was referenced in the previous study (Muhetaer et al, 2020). An intensity of 300 μmol m −2 s −1 was selected because it promotes rapid growth, followed by apoptosis with prolonged exposure (Senavirathna et al, 2021). The maximum intensity achievable by our system, 1200 μmol m −2 s −1 , was used, and an intensity of 700 μmol m −2 s −1 was considered to bridge the substantial gap between 300 and 1200 μmol m −2 s −1 .…”

Section: Methodsmentioning

confidence: 99%

Flow velocity and light intensity combination is important for Microcystis aeruginosa physical suppression

Senavirathna,

Yan

2024

Water Environment Research

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The cyanobacterial response to flow velocity or light intensity deviates from the combined effect of both factors. The responses of Microcystis aeruginosa to different combinations of flow velocities and light intensities were tested. Growth (OD730 and protein), stress (catalase, ascorbate peroxidase, and glutathione peroxidase), and photosynthetic ability (chlorophyll‐a and fluorescence) parameters of M. aeruginosa were measured to evaluate the effects of different combinations. Exposure to different flow velocity–light combinations significantly affected the growth and physiology of M. aeruginosa. Flow velocities of 0.4 m s−1 showed a prominent influence on most of the measured parameters compared with no flow velocity or higher flow velocity conditions. The 1.2‐m s−1 flow velocity and high light intensity (1200 μmol m−2 s−1) exposure caused a significant elevation in oxidative stress. Lower velocities are beneficial for M. aeruginosa at light stress, whereas extreme velocities are adverse and elevate the stress. Two categories of light–velocity combinations were identified as preferred and extreme categories, depending on whether they suppressed or supported M. aeruginosa growth. In controlling cyanobacteria blooms using flow or high‐intensity light, it is imperative to consider the interaction of these two factors, as their combined effects can significantly vary the stress levels in cyanobacteria. A new system, designed to minimize mechanical damage on M. aeruginosa, was used to generate flow velocities. Additionally, the combined effects of flow velocities and light intensities have been considered for the first time.Practitioner Points Flow velocity can influence the effect of light on Microcystis aeruginosa. High light exposure effect on Microcystis aeruginosa can be reduced by low flow velocity. High flow velocity and high light exposure increase the stress on Microcystis aeruginosa. Different light intensities and flow velocity combinations changed Microcystis aeruginosa stress physiology.

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The secondary outbreak risk and mechanisms of Microcystis aeruginosa after H2O2 treatment

Luo,

Chen,

Xian

et al. 2024

Journal of Hazardous Materials

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Stress and Recovery Responses of Microcystis aeruginosa Exposed to Extreme Light for Different Durations

Cited by 4 publications

References 42 publications

Temporal variation of 2‐MIB and geosmin production by Pseudanabaena galeata and Phormidium ambiguum exposed to high‐intensity light

Temporal variation of 2‐MIB and geosmin production by Pseudanabaena galeata and Phormidium ambiguum exposed to high‐intensity light

Flow velocity and light intensity combination is important for Microcystis aeruginosa physical suppression

The secondary outbreak risk and mechanisms of Microcystis aeruginosa after H2O2 treatment

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