Assessment of synergistic interactions between environmental factors on Microcystis aeruginosa growth and microcystin production

Geada, Pedro; Pereira, Ricardo N.; Vasconcelos, Vı́tor; Vicente, António A.; Fernandes, Bruno D.

doi:10.1016/j.algal.2017.09.006

Cited by 19 publications

(16 citation statements)

References 28 publications

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“…In general, growth rates showed optima around and above 31 °C that yielded an overall average optimum growth temperature of 34.3 °C (±2.3 °C) for the six strains and three endpoints used. This optimum growth temperature is somewhat higher than usually found in Microcystis ( Appendix E , Table A3 ) but Thomas and Litchman [ 41 ] reported a similar optimum of 34.1 °C in one of their M. aeruginosa strains (Bear AC-02), Geada et al [ 42 ] found the highest growth of M. aeruginosa at 35 °C and Mowe et al [ 28 ] at 36 °C. For some of the strains we have tested the optimum growth rate might even be above 37 °C.…”

Section: Discussionmentioning

confidence: 77%

“…Hence, five out of our six strains were able to grow at 37 °C. Likewise, in the literature considerable variability in the upper temperature limit Microcystis may tolerate is reported; four out of five tropical Microcytis were able to grow at 36 °C [ 28 ], one out of four Microcystis was able to grow at 35 °C but not at 40 °C, while another Microcystis even grew up to 40 °C [ 42 ]. Evidently, several Microcystis strains are well adapted to thrive under high temperature.…”

Section: Discussionmentioning

confidence: 99%

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Warming Affects Growth Rates and Microcystin Production in Tropical Bloom-Forming Microcystis Strains

Bui

Dao

et al. 2018

Toxins

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Warming climate is predicted to promote cyanobacterial blooms but the toxicity of cyanobacteria under global warming is less well studied. We tested the hypothesis that raising temperature may lead to increased growth rates but to decreased microcystin (MC) production in tropical Microcystis strains. To this end, six Microcystis strains were isolated from different water bodies in Southern Vietnam. They were grown in triplicate at 27 °C (low), 31 °C (medium), 35 °C (high) and 37 °C (extreme). Chlorophyll-a-, particle- and MC concentrations as well as dry-weights were determined. All strains yielded higher biomass in terms of chlorophyll-a concentration and dry-weight at 31 °C compared to 27 °C and then either stabilised, slightly increased or declined with higher temperature. Five strains easily grew at 37 °C but one could not survive at 37 °C. When temperature was increased from 27 °C to 37 °C total MC concentration decreased by 35% in strains with MC-LR as the dominant variant and by 94% in strains with MC-RR. MC quota expressed per particle, per unit chlorophyll-a and per unit dry-weight significantly declined with higher temperatures. This study shows that warming can prompt the growth of some tropical Microcystis strains but that these strains become less toxic.

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Section: Discussionmentioning

confidence: 77%

Section: Discussionmentioning

confidence: 99%

Warming Affects Growth Rates and Microcystin Production in Tropical Bloom-Forming Microcystis Strains

Bui

Dao

et al. 2018

Toxins

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“…Some species of cyanobacteria are known for their ability to fix nitrogen and thus giving them high chances of producing cyanotoxins [ 27 ]. Other studies have shown that microcystin toxicity is also influenced by changes in pH, temperature and light intensity [ 28 , 29 , 30 ]. A study conducted by Beversdorf et al, [ 27 ] indicated that some of the non-nitrogen fixing cyanobacteria may produce toxins because of nitrogen stress events.…”

Section: Introductionmentioning

confidence: 99%

The Presence of Toxic and Non-Toxic Cyanobacteria in the Sediments of the Limpopo River Basin: Implications for Human Health

Magonono

Oberholster

Shonhai

et al. 2018

Toxins

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The presence of harmful algal blooms (HABs) and cyanotoxins in drinking water sources poses a great threat to human health. The current study employed molecular techniques to determine the occurrence of non-toxic and toxic cyanobacteria species in the Limpopo River basin based on the phylogenetic analysis of the 16S rRNA gene. Bottom sediment samples were collected from selected rivers: Limpopo, Crocodile, Mokolo, Mogalakwena, Nzhelele, Lephalale, Sand Rivers (South Africa); Notwane (Botswana); and Shashe River and Mzingwane River (Zimbabwe). A physical-chemical analysis of the bottom sediments showed the availability of nutrients, nitrates and phosphates, in excess of 0.5 mg/L, in most of the river sediments, while alkalinity, pH and salinity were in excess of 500 mg/L. The FlowCam showed the dominant cyanobacteria species that were identified from the sediment samples, and these were the Microcystis species, followed by Raphidiopsis raciborskii, Phormidium and Planktothrix species. The latter species were also confirmed by molecular techniques. Nevertheless, two samples showed an amplification of the cylindrospermopsin polyketide synthetase gene (S3 and S9), while the other two samples showed an amplification for the microcystin/nodularin synthetase genes (S8 and S13). Thus, these findings may imply the presence of toxic cyanobacteria species in the studied river sediments. The presence of cyanobacteria may be hazardous to humans because rural communities and farmers abstract water from the Limpopo river catchment for human consumption, livestock and wildlife watering and irrigation.

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“…Microcystin, a toxic metabolite secreted by M. aeruginosa, was reported to be associated with a series of health risks (Zhou et al 2016). Therefore, in recent years, increasing research has focused on the regulation and removal of M. aeruginosa from water (Fujii et al 2014, Geada et al 2017, Načeradská et al 2017.…”

Section: Introductionmentioning

confidence: 99%

Toxic effects of potassium permanganate on photosystem II activity of cyanobacteria Microcystis aeruginosa

Li¹,

Pan²,

Mu³

2020

Photosynt.

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Effects of potassium permanganate (KMnO4) on PSII of Mycrocystis aeruginosa were investigated by measuring the chlorophyll fluorescence in vivo. KMnO4 exposure reduced the rate of oxygen evolution and cell growth. High concentration of KMnO4 (10 mg L −1 ) decreased the fast phase and increased the slow phase of QA − reoxidation kinetics. Electron transport after QA was blocked, resulting in a considerable amount of QA − reoxidation being performed via S2(QAQB) − charge recombination. KMnO4 decreased the density of the active photosynthetic reaction centers and the maximum quantum yield for primary photochemistry and inhibited electron transport, which resulted in a decline of the performance of PSII activity and caused an increase in dissipated energy flux per reaction center and antenna size. Our results suggest that both the donor side and the acceptor on the phase of QA − to QB to PQ of PSII in M. aeruginosa were targets of KMnO4 toxicity.Additional key words: fluorescence relaxation kinetics; inactive reaction center; S-state test. Abbreviations: ABS/RC, TR0/RC, ET0/RC, DI0/RC -absorption, trapped, electron transport and dissipated energy flux from the antenna per reaction center, respectively; Fv -the maximal variable fluorescence; OEC -oxygen-evolving complex; P680 -primary electron donor of PSII; PIabs -performance index; PQ -plastoquinone; RC -reaction center; RC/CS0 -amount of active PSII reaction centers per cross section; S2(QAQB) -QAQB − state with the S2 state of the water-oxidizing complex; φP0, φE0, φD0 -quantum yields of electron transport in PSII reaction center to QA, from QA − to plastoquinone and in energy dissipation, respectively; ψ0 -probability that the electron reaches electron carriers after QA − .

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Assessment of synergistic interactions between environmental factors on Microcystis aeruginosa growth and microcystin production

Cited by 19 publications

References 28 publications

Warming Affects Growth Rates and Microcystin Production in Tropical Bloom-Forming Microcystis Strains

Warming Affects Growth Rates and Microcystin Production in Tropical Bloom-Forming Microcystis Strains

The Presence of Toxic and Non-Toxic Cyanobacteria in the Sediments of the Limpopo River Basin: Implications for Human Health

Toxic effects of potassium permanganate on photosystem II activity of cyanobacteria Microcystis aeruginosa

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