Simultaneous analysis of photosystem responses of Microcystis aeruginoga under chromium stress

Wang, Shuzhi; Chen, Fulong; Mu, Shuyong; Zhang, Daoyong; Pan, Xiangliang; Lee, Duu-Jung

doi:10.1016/j.ecoenv.2012.11.009

Cited by 43 publications

(15 citation statements)

References 30 publications

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“…3) provided further evidence of the effect of CMQ upon photosystem activity. It has been reported that the value of ETR(II) decreases sharply if the activity of photosystem and linear electron flow is inhibited effectively (Gao et al 2011;Wang et al 2013). The decrease in both Y(II) and ETR(II) by high CMQ concentrations shown in this study, also supported the positive correlation between Y(II) and ETR(II) obtained by previous studies (Maxwell and Johnson 2000;Suzuki et al 2011;Gao et al 2011;Wang et al 2013).…”

Section: Resultssupporting

confidence: 80%

“…However, quantum yields of Y(II) and Y(NPQ) significantly decreased and Y(D) sharply increased under the stress of 5 and 10 mg L -1 CMQ, reaching the minimum at 10 mg L -1 (Table 2). These results suggest that PSII in M. aeruginosa was severely damaged at the higher concentrations, similar to observations by Wang et al (2013) for Cr(VI). The greater amplitude change and loss of the lognormal shape to the RLC of ETR(II) with increased CNQ concentration (Fig.…”

Section: Resultssupporting

confidence: 76%

“…It has been reported that the value of ETR(II) decreases sharply if the activity of photosystem and linear electron flow is inhibited effectively (Gao et al 2011;Wang et al 2013). The decrease in both Y(II) and ETR(II) by high CMQ concentrations shown in this study, also supported the positive correlation between Y(II) and ETR(II) obtained by previous studies (Maxwell and Johnson 2000;Suzuki et al 2011;Gao et al 2011;Wang et al 2013). Therefore, it is suggested that that concentrations of CMQ C 5 mg L -1 cause PSII inactivity and linear electron flow blockage in M. aeruginosa, leading to the formation of oxygen radicals and consequent oxidative stress.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Multiparameter-Based Bioassay of 2-(4-Chlorophenyl)-4-(4-methoxyphenyl) Quinazoline, a Newly-Synthesized Quinazoline Derivative, Toward Microcystis aeruginosa HAB5100 (Cyanobacteria)

Zhao

Liu

et al. 2015

Bull Environ Contam Toxicol

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Quinazoline derivatives have wide biological activities and therapeutic properties, implying their potential for development and application on a large scale. In the present study, 2-(4-chlorophenyl)-4-(4-methoxyphenyl) quinazoline (CMQ), was selected to examine its effect on unicellular cyanobacteria, Microcystis aeruginosa by evaluating growth, physiological and molecular responses. Growth was inhibited by CMQ, with a 96 h EC 50 of 1.93 ± 0.19 mg L -1 . The up-regulated expression of prx was shown, reflecting that oxidative stress might be a toxic factor of CMQ. At higher concentrations of CMQ, the quantum yields of Y(II) and Y(NPQ) in photosystem II decreased seriously and Y(NO) increased sharply, and psbA gene encoding for D1 protein was over-expressed. These results demonstrated that high concentrations of CMQ had different inhibitory targets associated with photosystem electron transport and with sites beyond the electron transport chain, leading to severe toxicity.

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Section: Resultssupporting

confidence: 80%

Section: Resultssupporting

confidence: 76%

Section: Resultsmentioning

confidence: 99%

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Multiparameter-Based Bioassay of 2-(4-Chlorophenyl)-4-(4-methoxyphenyl) Quinazoline, a Newly-Synthesized Quinazoline Derivative, Toward Microcystis aeruginosa HAB5100 (Cyanobacteria)

Zhao

Liu

et al. 2015

Bull Environ Contam Toxicol

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“…This may be because stress exceeded the tolerance limit of M. aeruginosa TY001, causing cell integrity, membrane structure, and photosynthetic capacity to fail. Chlorophylls are the primary algal photosynthetic pigment and play a significant role in light harvesting, light energy transfer, and conversion during the photosynthesis process [24]. The chlorophyll a content decreased markedly after exposure to pyrogallol, which may be because the stress of the allelochemical decreased the photo-oxidation capacity of M. aeruginosa TY001.…”

Section: Discussion Of Resultsmentioning

confidence: 99%

“…But the photosynthesis of cyanobacteria could not be predicted based on only one gene. Moreover, chlorophyll fluorescence measurements have been proved to be a rapid and reliable means to exhibit changes in photosynthesis of algae under environment stress [23][24]. The effects of chlorophyll fluorescence parameters of M. aeruginosa treated with pyrogallol have not been adequately studied, despite the fact that these effects can reliably indicate changes in photosynthetic efficiency under environmental stress [25].…”

Section: Introductionmentioning

confidence: 99%

Photosynthesis Inhibition of Pyrogallol Against the Bloom-Forming Cyanobacterium Microcystis aeruginosa TY001

Wang¹,

Liu²,

Lv³

et al. 2016

Pol. J. Environ. Stud.

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Severe eutrophication and harmful cyanobacterial blooms of freshwater ecosystems has been a persistent environmental topic in recent decades. Allelochemical inhibition has received great attention in aquatic ecology and quality management. This study investigates the growth and full photosynthesis performance of pyrogallol on Microcystis aeruginosa TY001. The growth and pigment contents of M. aeruginosa were seriously inhibited by pyrogallol. The relative expression levels of the nblA gene were up-regulated under pyrogallol treatments. Unexpectedly, the relative transcript abundance of the psaB and psbA genes significantly increased compared with the control, but the chlorophyll fluorescence parameters of M. aeruginosa TY001 decreased significantly, except at 1 mg L -1 pyrogallol. In conclusion, the target sites of pyrogallol's toxic effect on the PSII of M. aeruginosa TY001 were mainly on the active reaction centers and the electron transport at the acceptor side.

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PSI Showed Higher Tolerance to Sb(V) than PSII Due to Stimulation of Cyclic Electron Flow Around PSI

2014

Self Cite

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The knowledge of the effects of Sb(V) on the physiological characteristics of cyanobacteria was still limited. In the present study, responses of photosystem I and II (PSI and PSII), cyclic electron flow (CEF), and interphotosystem electron transport of Microcystis aeruginosa to 5-100 mg/l Sb(V) were synchronously measured using the Dual-PAM-100. 5 mg/l Sb (V) significantly inhibited PSII activity, but had no significant effects on PSI activity. At higher concentrations of Sb(V), the quantum yield and electron transport of PSI were less affected compared to PSII. The ratio of Y(II)/Y(I) significantly decreased with increasing Sb(V) concentration. It decreased from 0.7 for control to 0.4 for 100 mg/l Sb(V)-treated cells, indicating that the change of the distribution of quantum yields between two photosystems and more serious inhibition of PSII under stress of Sb(V) compared to PSI. CEF was activated associated with the inhibition of linear electron flow after exposure to Sb(V). The contribution of Y(CEF) to the quantum yield and activity of PSI increased with increasing Sb(V) concentrations. The cyclic electron transport rate made a significant contribution to electron transport rate of PSI, especially at high Sb(V) concentration (100 mg/l) and high illumination (above 555 μmol photons/m(2)/s). The stimulation of CEF was essential for the higher tolerance of PSI than PSII to Sb(V).

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Simultaneous analysis of photosystem responses of Microcystis aeruginoga under chromium stress

Cited by 43 publications

References 30 publications

Multiparameter-Based Bioassay of 2-(4-Chlorophenyl)-4-(4-methoxyphenyl) Quinazoline, a Newly-Synthesized Quinazoline Derivative, Toward Microcystis aeruginosa HAB5100 (Cyanobacteria)

Multiparameter-Based Bioassay of 2-(4-Chlorophenyl)-4-(4-methoxyphenyl) Quinazoline, a Newly-Synthesized Quinazoline Derivative, Toward Microcystis aeruginosa HAB5100 (Cyanobacteria)

Photosynthesis Inhibition of Pyrogallol Against the Bloom-Forming Cyanobacterium Microcystis aeruginosa TY001

PSI Showed Higher Tolerance to Sb(V) than PSII Due to Stimulation of Cyclic Electron Flow Around PSI

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