Journal of Microbiology

Review

Biological and Chemical Approaches for Controlling Harmful Microcystis Blooms: Wonjae Kim, Yerim Park, Jaejoon Jung, Che Ok Jeon, Masanori Toyofuku, Jiyoung Lee, Woojun Park; J. Microbiol. 2024;62(3):249-260. Published online April 8, 2024; DOI: https://doi.org/10.1007/s12275-024-00115-2

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The proliferation of harmful cyanobacterial blooms dominated by Microcystis aeruginosa has become an increasingly serious problem in freshwater ecosystems due to climate change and eutrophication. Microcystis-blooms in freshwater generate compounds with unpleasant odors, reduce the levels of dissolved O₂, and excrete microcystins into aquatic ecosystems, potentially harming various organisms, including humans. Various chemical and biological approaches have thus been developed to mitigate the impact of the blooms, though issues such as secondary pollution and high economic costs have not been adequately addressed. Red clays and H₂O₂ are conventional treatment methods that have been employed worldwide for the mitigation of the blooms, while novel approaches, such as the use of plant or microbial metabolites and antagonistic bacteria, have also recently been proposed. Many of these methods rely on the generation of reactive oxygen species, the inhibition of photosynthesis, and/or the disruption of cellular membranes as their mechanisms of action, which may also negatively impact other freshwater microbiota. Nevertheless, the underlying molecular mechanisms of anticyanobacterial chemicals and antagonistic bacteria remain unclear. This review thus discusses both conventional and innovative approaches for the management of M. aeruginosa in freshwater bodies.

Citations

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Strong inhibitory effects of Desmodesmus sp. on Microcystis blooms: Potential as a biological control agent in aquaculture
Bo Yang, Yuhua Li, Zihan Wang, Zhiguang Yue, Junqi Wen, Xueqin Zhao, Hu Zhang, Xianfeng Wang, Xiufen Wang, Man Zhang
Aquaculture Reports.2025; 40: 102579. CrossRef
Field-scale artificial floating islands reduces cyanotoxin from residential raw sewage treatment basin
Zhaozhe Chen, Jiyoung Lee, Molly Mills, Abigail Volk, Ozeas S. Costa
Ecological Engineering.2025; 212: 107543. CrossRef
Artificial Intelligence-Based Microfluidic Platform for Detecting Contaminants in Water: A Review
Yihao Zhang, Jiaxuan Li, Yu Zhou, Xu Zhang, Xianhua Liu
Sensors.2024; 24(13): 4350. CrossRef
Alleviation of H2O2 toxicity by extracellular catalases in the phycosphere of Microcystis aeruginosa
Yerim Park, Wonjae Kim, Yeji Cha, Minkyung Kim, Woojun Park
Harmful Algae.2024; 137: 102680. CrossRef
Extensive Genomic Rearrangement of Catalase-Less Cyanobloom-Forming Microcystis aeruginosa in Freshwater Ecosystems
Minkyung Kim, Jaejoon Jung, Wonjae Kim, Yerim Park, Che Ok Jeon, Woojun Park
Journal of Microbiology.2024; 62(11): 933. CrossRef
Laboratory-Simulated Inhibitory Effects of the Floating-Bed Plants on Microcystis aeruginosa and Their Microbial Communities’ Responses to Microcystins
Shuwen Zhang, Yuanpu Sha, Yuanyuan Tang, Longjie Li, Feihu Wang, Jing Dong, Xuejun Li, Yunni Gao, Xiaofei Gao, Huatao Yuan, Jingxiao Zhang
Microorganisms.2024; 12(10): 2035. CrossRef
Host-Associated Microbiome
Woo Jun Sul
Journal of Microbiology.2024; 62(3): 135. CrossRef

Research Support, Non-U.S. Gov't

Cupriavidus and Burkholderia Species Associated with Agricultural Plants that Grow in Alkaline Soils: Paulina Estrada-de los Santos , Nora Belinda Vacaseydel-Aceves , Lourdes Martínez-Aguilar , María Antonia Cruz-Hernández , Alberto Mendoza-Herrera , Jesús Caballero-Mellado; J. Microbiol. 2011;49(6):867-876. Published online December 28, 2011; DOI: https://doi.org/10.1007/s12275-011-1127-9

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Abstract: The presence of Burkholderia, Cupriavidus, and Ralstonia species in northeastern Mexico was investigated. An analysis of the root surrounding soil from different agricultural plants led to the isolation of Burkholderia and Cupriavidus species but no Ralstonia strains. Most Cupriavidus species were unknown and grouped into two clusters according to ARDRA profiles. The 16S rRNA sequence analysis showed that the Cupriavidus isolates were highly related among them and with different Cupriavidus species with validated names. However, SDS-PAGE profiles were distinct among the different ARDRA profiles and to other Cupriavidus species examined, suggesting new species in the genus. This shows that Cupriavidus is more widely associated with plants than previously appreciated. The BCC isolate was 99% similar to B. cenocepacia by recA sequence analysis. Additionally, most Cupriavidus strains from the two largest groups grew on media containing up to 0.1 mg/ml of copper, 10.0 mg/ml arsenic and 1.0 mg/ml zinc. Burkholderia strains grew on media containing up to 10.0 mg/ml zinc, 5.0 mg/ml arsenic and 0.1 mg/ml copper.

Journal Article

New Phylogenetic Lineages of the Spirochaetes Phylum Associated with Clathrina Species (Porifera): Sven C. Neulinger , Rüdiger Stöhr , Vera Thiel , Rolf Schmaljohann , Johannes F. Imhoff; J. Microbiol. 2010;48(4):411-418. Published online August 20, 2010; DOI: https://doi.org/10.1007/s12275-010-0017-x

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Abstract: Though spirochetes have been repeatedly found in marine sponges and other invertebrates, little attention has been paid to the specificity of this association. This study demonstrates that different genoand morphotypes of spirochetes can reside within the same sponge individual and develop in considerable numbers. Specimens of the calcareous sponge Clathrina clathrus collected from the Adriatic Sea off Rovinj (Croatia) were found to harbor spirochete-like bacteria, which were characterized by scanning electron microscopy (SEM), 16S rRNA gene analysis, and catalyzed reporter deposition fluorescence in situ hybridization (CARD-FISH). Two novel spirochete sequence types related to the Brachyspiraceae could be retrieved. By use of specifically designed CARD-FISH probes, the C. clathrus-associated sequences could be assigned to a linear and a helical spirochete morphotype. Both were located within the sponge mesohyl and resembled the spirochete-like cells identified by SEM. In addition, from a Clathrina sp., most likely C. coriacea, that originated from Indonesian coastal waters, four different spirochete type sequences were recovered. Two of these also affiliated with the Brachyspiraceae, the other two were found associated with the Spirochaetaceae, one with the genera Borrelia and Cristispira.

Research Support, Non-U.S. Gov't

A Bacterium Belonging to the Burkholderia cepacia Complex Associated with Pleurotus ostreatus: Ricardo Yara , Walter Maccheroni Junior , Jorge Horii , Joao Lucio Azevedo; J. Microbiol. 2006;44(3):263-268.; DOI: https://doi.org/2387 [pii]

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Abstract: Pleurotus ostreatus is a widely cultivated white-rot fungus. Owing to its considerable enzymatic versatility P. ostreatus has become the focus of increasing attention for its possible utility in biobleaching and bioremediation applications. Interactions between microorganisms can be an important factor in those processes. In this study, we describe the presence of a bacterial species associated with P. ostreatus strain G2. This bacterial species grew slowly (approximately 30 days) in theliquid and semi-solid media tested. When P. ostreatus was inoculated in solid media containing Tween 80 or Tween 20, bacterial microcolonies were detected proximal to the fungal colonies, and the relevant bacterium was identified via the analysis of a partial 16S rDNA sequence; it was determined to belong to the Burkholderia cepacia complex, but was not closely related to other fungus-isolated Burkholderiaceae. New specific primers were designed, and confirmed the presence of in vitro P. ostreatus cultures. This is the first time that a bacterial species belonging to the B. cepacia complex has been found associated with P. ostreatus.

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