Responses of
            <i>Microcystis aeruginosa</i>
            (Cyanobacteria) to sanguinarine stress: morphological and physiological characteristics associated with competitive advantage

Lin, Yiqing; He, Yaxian; Qing, Chun; Peng, Liang; Luo, Si; Shao, Jihai

doi:10.1080/00318884.2018.1561966

Cited by 6 publications

(5 citation statements)

References 39 publications

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“…A decrease of ϕE 0 in this study indicates that NH + 4 stress decreased the quantum yield used for electron transfer. The parameters ϕE 0 and ψ 0 reflect the performance of electron donor side and acceptor side of PS II reaction center, respectively (Lin et al, 2019). Our results about the variations of ϕP 0 and ψ 0 indicated that NH + 4 stress in paddy floodwater damaged the electron donor side of reaction center of PS II but did not influence its acceptor side.…”

Section: Discussionmentioning

confidence: 71%

“…Our results showed that NH + 4 stress decreased phycobiliprotein content in cells of GXM, suggesting that NH + 4 stress may decrease light energy absorption by antenna complex of cyanobacteria. APC is more efficient than PC in light collection (Lin et al, 2019). Therefore, the increase of APC/PC ratio improves light energy capture efficiency.…”

Section: Discussionmentioning

confidence: 99%

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Biotoxicity of NH4+ on Nostoc Sphaeroides (diazotrophic cyanobacteria) in paddy floodwater

Shao,

Fan,

Feng

2023

Appl Env Biotechnol

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In order to elucidate the toxicity of NH4+ on Nostoc Sphaeroides (commonly named GE-XIAN-MI in China, GXM), a diazotrophic cyanobacterium in paddy fields, this study investigated the growth, photosynthesis, N2-fixation, and oxidative-antioxidative characteristics of GXM under NH4+ stress in paddy floodwater. The results showed that the photosynthesis and the N2-fixing ability of GXM were inhibited by NH4+ at a concentration of 13.46 mg L-1 in paddy floodwater. The main target of NH4+ on photosystem II (PS II) of GXM was the electron donor side of react center. Oxygen evolution complex (OEC) was the secondary target of toxicity of NH4+ on PS II. The damage of PS II led to accumulation of ROS and resulted in oxidative damage on plasma membrane of GXM. Feedback inhibition and decrease of photosynthetic energy production may be the reasons for the decrease of N2-fixing ability of GXM under NH4+ stress. The results presented in this study suggest that high level of NH4+ loading may be a reason for the recession of GXM resource in paddy fields.

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Section: Discussionmentioning

confidence: 71%

Section: Discussionmentioning

confidence: 99%

Biotoxicity of NH4+ on Nostoc Sphaeroides (diazotrophic cyanobacteria) in paddy floodwater

Shao,

Fan,

Feng

2023

Appl Env Biotechnol

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“…In recognition of the profound effects of microcystins on ingesting organisms, we evaluated how contaminants affect microcystins. We found that various contaminants induce hormesis, promoting microcystins synthesis and elevating intracellular microcystins concentrations. − ,,− ,− , Microcystins are typically enhanced within 1–4 days and increase further and often remain elevated for nearly 4 weeks from exposure to protect against stress in early stages and enhance the survival odds of live cells in the algal population. ,− ,,, Even growth-inhibitory high doses of contaminants, such as antibiotics and microplastics, can enhance the production of microcystins, and thus their concentrations and release in the environment, before suppressing it. ,,, Hence, low or high sublethal doses can also increase the release of microcystins in the environment, and total or extracellular microcystins decrease at lethal doses due to decreased cell density. ,,,,,,,,− ,,, …”

Section: Microcystinsmentioning

confidence: 95%

“…This screening revealed eight additional papers. Thus, a total of 39 papers are included in this review, most of which include multifactorial experiments, such as different contaminants, strains, or additional experimental treatments other than contaminants. − …”

Section: Literature Review Methodologymentioning

confidence: 99%

“…40,47,61,62 Hence, low or high sublethal doses can also increase the release of microcystins in the environment, and total or extracellular microcystins decrease at lethal d o s e s d u e t o d e c r e a s e d c e l l d e nsity. 34,36,38,39,42,43,45,47,[51][52][53][54][55]61,63,64 We estimated the average stimulation of the production ability or concentration of microcystins by low, sub-NOAEL doses of contaminants at 57.9% of the control value (95% CI e s t i m a t e d a t 5 3 . 7 − 6 2 .…”

Section: ■ Microcystinsmentioning

confidence: 99%

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Low Levels of Contaminants Stimulate Harmful Algal Organisms and Enrich Their Toxins

Agathokleous

Peñuelas

Azevedo

et al. 2022

Environ. Sci. Technol.

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A widespread increase in intense phytoplankton blooms has been noted in lakes worldwide since the 1980s, with the summertime peak intensity amplifying in most lakes. Such blooms cause annual economic losses of multibillion USD and present a major challenge, affecting 11 out of the 17 United Nations Sustainable Development Goals. Here, we evaluate recent scientific evidence for hormetic effects of emerging contaminants and regulated pollutants on Microcystis sp., the most notorious cyanobacteria forming harmful algal blooms and releasing phycotoxins in eutrophic freshwater systems. This new evidence leads to the conclusion that pollution is linked to algal bloom intensification. Concentrations of contaminants that are considerably smaller than the threshold for toxicity enhance the formation of harmful colonies, increase the production of phycotoxins and their release into the environment, and lower the efficacy of algaecides to control algal blooms. The low-dose enhancement of microcystins is attributed to the up-regulation of a protein controlling microcystin release (McyH) and various microcystin synthetases in tandem with the global nitrogen regulator Ycf28, nonribosomal peptide synthetases, and several ATP-binding cassette transport proteins. Given that colony formation and phycotoxin production and release are enhanced by contaminant concentrations smaller than the toxicological threshold and are widely occurring in the environment, the effect of contaminants on harmful algal blooms is more prevalent than previously thought. Climate change and nutrient enrichment, known mechanisms underpinning algal blooms, are thus joined by low-level pollutants as another causal mechanism.

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Plant allelochemicals inhibit the growth and colony formation of Microcystis

Ma,

Wang,

Zhou

et al. 2024

J. Ocean. Limnol.

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Responses of Microcystis aeruginosa (Cyanobacteria) to sanguinarine stress: morphological and physiological characteristics associated with competitive advantage

Cited by 6 publications

References 39 publications

Biotoxicity of NH4+ on Nostoc Sphaeroides (diazotrophic cyanobacteria) in paddy floodwater

Biotoxicity of NH4+ on Nostoc Sphaeroides (diazotrophic cyanobacteria) in paddy floodwater

Low Levels of Contaminants Stimulate Harmful Algal Organisms and Enrich Their Toxins

Plant allelochemicals inhibit the growth and colony formation of Microcystis

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