Characterization and effects of two algicidal isolates on antioxidase activities of <scp><i>C</i></scp><i>hlorella pyrenoidosa</i>

Liao, Chunli; Liu, Xiaobo; Liu, Ruifang; Shan, Ling

doi:10.1002/ep.12170

Cited by 26 publications

(8 citation statements)

References 20 publications

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“…CAT is one of the most important enzymes in the antioxidant system. It could promote decomposition and prevent the accumulation of harmful H 2 O 2 in cells [54]. In our study, the supernatant of Sp34 significantly increased the CAT activity, thus decomposing H 2 O 2 and mitigating the oxidative damage to algal cells [55].…”

Section: Discussionsupporting

confidence: 51%

Algicidal characterization and mechanism of Bacillus licheniformis Sp34 against Microcystis aeruginosa in Dianchi Lake

et al. 2019

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Microcystis aeruginosa blooms are a worldwide serious environmental problem and bloom control with bacteria is promising. In this study, a Bacillus licheniformis strain Sp34 with potent algicidal and inhibitory effects on the microcystins synthesis against fast‐growing M. aeruginosa was isolated from Dianchi Lake. Sp34 killed the bloom‐causing algal strain M. aeruginosa DCM4 of Dianchi Lake with an initial Chlorophyll‐a concentration of 2.0 mg/L at a cell density of no less than 1.35 × 105 CFU/ml. It can also efficiently kill some other harmful algal species, such as M. wesenbergii and Phormidium sp. The algicidal activity of Sp34 relied on the release of algicidal substances, which had good heat (−20°C to 121°C) and acid–base (pH 3–11) resistance. In addition, the high algicidal activity depended on the good growth of algae indicated by the significantly positive correlations between algal growth and algicidal ratio (p < .001). The algicidal effect of Sp34 involved causing oxidative stress, lipid peroxidation, and morphological injury of algal cells, along with DNA damage and dysfunction of DNA‐repair function, weakening the photosynthesis system, and inhibiting microcystin synthesis. In general, Sp34 can kill fast‐growing M. aeruginosa and inhibit algal microcystin synthesis efficiently, so, it is a promising biocontrol agent to mitigate cyanobacterial blooms.

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Section: Discussionsupporting

confidence: 51%

Algicidal characterization and mechanism of Bacillus licheniformis Sp34 against Microcystis aeruginosa in Dianchi Lake

et al. 2019

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“…predominantly aimed at cyanobacteria, alga-lytic activity of Enterobacter spp. expands also to green algae [ 58 – 60 ]. Since both cyanobacteria and green algae were present in the feedstock for the described here AD in a UASB reactor (see Materials and Methods), we can suggest that members of Pseudomonadales and Enterobacteriales orders have an alga-lytic activity towards microalgal biomass from Logan Wastewater Lagoons.…”

Section: Discussionmentioning

confidence: 99%

Qualitative Analysis of Microbial Dynamics during Anaerobic Digestion of Microalgal Biomass in a UASB Reactor

Doloman

Soboh

Walters

et al. 2017

International Journal of Microbiology

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Anaerobic digestion (AD) is a microbiologically coordinated process with dynamic relationships between bacterial players. Current understanding of dynamic changes in the bacterial composition during the AD process is incomplete. The objective of this research was to assess changes in bacterial community composition that coordinates with anaerobic codigestion of microalgal biomass cultivated on municipal wastewater. An upflow anaerobic sludge blanket reactor was used to achieve high rates of microalgae decomposition and biogas production. Samples of the sludge were collected throughout AD and extracted DNA was subjected to next-generation sequencing using methanogen mcrA gene specific and universal bacterial primers. Analysis of the data revealed that samples taken at different stages of AD had varying bacterial composition. A group consisting of Bacteroidales, Pseudomonadales, and Enterobacteriales was identified to be putatively responsible for the hydrolysis of microalgal biomass. The methanogenesis phase was dominated by Methanosarcina mazei. Results of observed changes in the composition of microbial communities during AD can be used as a road map to stimulate key bacterial species identified at each phase of AD to increase yield of biogas and rate of substrate decomposition. This research demonstrates a successful exploitation of methane production from microalgae without any biomass pretreatment.

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“…At light intensities of 2500 lx and 4500 lx, CAT activity was lowest at 0 rpm water disturbance (Figure 1c), algal cell density was also lowest, which indicated that increasing appropriate water disturbance is beneficial for enhancing enzyme activity in algal cells to promote algal growth. Liao et al observed that the trend in CAT was the same as the density of algal cells during cultivation (Liao et al, 2015). Thus, algal cells may not grow and reproduce normally when cells contain less CAT.…”

Section: Resultsmentioning

confidence: 99%

Effects of light and water disturbance on the growth of Microcystis aeruginosa and the release of algal toxins

Zhang

Lin

et al. 2021

Water Environment Research

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Eutrophication of water constitutes a serious threat to global water quality. Light intensity and water disturbance are important factors affecting the growth of algae and the release of algal toxins. In this study, algal growth indicators, algal enzyme systems, and algal toxin release in Microcystis aeruginosa under different light intensities and water disturbances were determined. The results showed that 2500 lx and 120 rpm were the optimal conditions for the growth of M. aeruginosa. The growth of algal cells was inhibited by high light intensity and high water disturbance. However, the optimal conditions for algal growth were not favorable conditions for the release of algal toxin. The highest concentration of microcystin‐LR (MC‐LR), observed at 4500 lx and 80 rpm, was 198.1 μg/L, whereas the highest single cell toxin production reached up to 10.49 × 10−9 μg/cell at 7000 lx and 120 rpm. Redundancy analysis results showed that the concentration of MC‐LR was positively correlated with algal cell density and antioxidant enzyme activities (superoxide dismutase, catalase, peroxidase, and malondialdehyde [MDA]) and negatively correlated with the total nitrogen and total phosphorus consumption rates and MDA. Single cell toxin production was negatively correlated with algal cell density and antioxidant enzyme activity but positively correlated with MDA content. Practitioner Points There was an optimal water disturbance condition for algae growth affected by the light intensity. Optimal conditions for algae cell growth are not necessarily the optimal conditions for algal toxin release. Enzyme indicators have correlation with the release of algae toxins and the growth of algae cells.

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Characterization and effects of two algicidal isolates on antioxidase activities of Chlorella pyrenoidosa

Cited by 26 publications

References 20 publications

Algicidal characterization and mechanism of Bacillus licheniformis Sp34 against Microcystis aeruginosa in Dianchi Lake

Algicidal characterization and mechanism of Bacillus licheniformis Sp34 against Microcystis aeruginosa in Dianchi Lake

Qualitative Analysis of Microbial Dynamics during Anaerobic Digestion of Microalgal Biomass in a UASB Reactor

Effects of light and water disturbance on the growth of Microcystis aeruginosa and the release of algal toxins

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