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Zhang Y, Wang X, Sun Y. A newly identified algicidal bacterium of Pseudomonas fragi YB2: Algicidal compounds and effects. JOURNAL OF HAZARDOUS MATERIALS 2024; 478:135490. [PMID: 39141946 DOI: 10.1016/j.jhazmat.2024.135490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2024] [Revised: 08/03/2024] [Accepted: 08/10/2024] [Indexed: 08/16/2024]
Abstract
Harmful algal bloom (HAB) is an unresolved existing problem worldwide. Here, we reported a novel algicidal bacterium, Pseudomonas fragi YB2, capable of lysing multiple algal species. To Chlorella vulgaris, YB2 exhibited a maximum algicidal rate of 95.02 % at 120 h. The uniqueness of YB2 lies in its ability to self-produce three algicidal compounds: 2-methyl-1, 3-cyclohexanedione (2-MECHD), N-phenyl-2-naphthylamine, and cyclo (Pro-Leu). The algicidal properties of 2-MECHD have not been previously reported. YB2 significantly affected the chloroplast and mitochondrion, thus decreasing in chlorophyll a by 4.74 times for 120 h and succinate dehydrogenase activity by 103 times for 36 h. These physiological damages disrupted reactive oxygen species and Ca2+ homeostasis at the cellular level, increasing cytosolic superoxide dismutase (23 %), catalase (35 %), and Ca2+ influx. Additionally, the disruption of Ca2+ homeostasis rarely reported in algicidal bacteria-algae interaction was observed using the non-invasive micro-test technology. We proposed a putative algicidal mechanism based on the algicidal outcomes and physiological algicidal effects and explored the potential of YB2 through an algicidal simulation test. Overall, this study is the first to report the algicidal bacterium P. fragi and identify a novel algicidal compound, 2-MECHD, providing new insights and a potent microbial resource for the biocontrol of HAB.
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Affiliation(s)
- Yini Zhang
- School of Environment, Northeast Normal University, Changchun 130117, Jilin, PR China.
| | - Xiaoyu Wang
- School of Environment, Northeast Normal University, Changchun 130117, Jilin, PR China.
| | - Yu Sun
- School of Environment, Northeast Normal University, Changchun 130117, Jilin, PR China.
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Li H, Xing R, Ji X, Liu Y, Chu X, Gu J, Wang S, Wang G, Zhao S, Cao X. Natural algicidal compounds: Strategies for controlling harmful algae and application. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2024; 215:108981. [PMID: 39163650 DOI: 10.1016/j.plaphy.2024.108981] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Revised: 07/02/2024] [Accepted: 07/28/2024] [Indexed: 08/22/2024]
Abstract
The expanding impact of algal blooms on marine areas poses a severe threat to the sustainable development of aquaculture, human health, and the ecological safety of coastal areas. To address this issue, the exploration of natural algicidal compounds with high efficiency, selectivity, and environmental friendliness has gained attention as potential substances for algae removal. However, the integration of related work still needs to be improved. Therefore, an in-depth study of algicidal strategies and applications of algicidal compounds for biodiversity has become crucial. Here, we aim to consolidate the current advancements in research on the sources and types of algicidal compounds. We also delve into various algicidal strategies, including the damage inflicted on algal structures, inhibition of photosynthesis, effects on oxidative damage, and impacts on gene expression. Additionally, we highlight practical applications of algicidal compounds, taking into account their specificities and limitations. This review contributes to the protection of marine biodiversity and the promotion of sustainable environmental development. Furthermore, we provide recommendations for future research on algicidal compounds to overcome existing barriers. By doing so, we hope to offer valuable references for researchers engaged in further studies on managing algal outbreaks.
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Affiliation(s)
- Huili Li
- College of Life Sciences, Yantai University, Yantai, Shandong Province, 264005, PR China
| | - Ronglian Xing
- College of Life Sciences, Yantai University, Yantai, Shandong Province, 264005, PR China.
| | - Xingyu Ji
- College of Life Sciences, Yantai University, Yantai, Shandong Province, 264005, PR China
| | - Yi Liu
- College of Chemistry and Chemical Engineering, Yantai University, Yantai, Shandong Province, 264005, PR China
| | - Xinran Chu
- College of Life Sciences, Yantai University, Yantai, Shandong Province, 264005, PR China
| | - Jiaxin Gu
- College of Life Sciences, Yantai University, Yantai, Shandong Province, 264005, PR China
| | - Shengnan Wang
- College of Life Sciences, Yantai University, Yantai, Shandong Province, 264005, PR China
| | - Gexuan Wang
- College of Life Sciences, Yantai University, Yantai, Shandong Province, 264005, PR China
| | - Shijun Zhao
- College of Life Sciences, Yantai University, Yantai, Shandong Province, 264005, PR China
| | - Xuebin Cao
- State Key Laboratory for Quality and Safety of Agro-products, Ningbo University, Ningbo, Zhejiang Province, 315832, PR China; Yantai Jinghai Marine Fisheries Co., LTD, Yantai, Shandong Province, 264000, PR China
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Maire Y, Schmitt FG, Kormas K, Vasileiadis S, Caruana A, Skouroliakou DI, Bampouris V, Courcot L, Hervé F, Crouvoisier M, Christaki U. Effects of turbulence on diatoms of the genus Pseudo-nitzschia spp. and associated bacteria. FEMS Microbiol Ecol 2024; 100:fiae094. [PMID: 38986513 PMCID: PMC11264304 DOI: 10.1093/femsec/fiae094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2023] [Revised: 04/30/2024] [Accepted: 07/09/2024] [Indexed: 07/12/2024] Open
Abstract
Turbulence is one of the least investigated environmental factors impacting the ecophysiology of phytoplankton, both at the community and individual species level. Here, we investigated, for the first time, the effect of a turbulence gradient (Reynolds number, from Reλ = 0 to Reλ = 360) on two species of the marine diatom Pseudo-nitzschia and their associated bacterial communities under laboratory conditions. Cell abundance, domoic acid (DA) production, chain formation, and Chl a content of P. fraudulenta and P. multiseries were higher for intermediate turbulence (Reλ = 160 or 240). DA was detectable only in P. multiseries samples. These observations were supported by transcriptomic analyses results, which suggested the turbulence related induction of the expression of the DA production locus, with a linkage to an increased photosynthetic activity of the total metatranscriptome. This study also highlighted a higher richness of the bacterial community associated with the nontoxic strain of P. fraudulenta in comparison to the toxic strain of P. multiseries. Bacillus was an important genus in P. multiseries cultures (relative abundance 15.5%) and its highest abundances coincided with the highest DA levels. However, associated bacterial communities of both Pseudo-nitzschia species did not show clear patterns relative to turbulence intensity.
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Affiliation(s)
- Yanis Maire
- Université du Littoral Côte d'Opale, CNRS, Université de Lille, UMR 8187 LOG, 32 Ave. Foch, F-62930 Wimereux, France
| | - François G Schmitt
- Université du Littoral Côte d'Opale, CNRS, Université de Lille, UMR 8187 LOG, 32 Ave. Foch, F-62930 Wimereux, France
| | - Konstantinos Kormas
- Department of Ichthyology and Aquatic Environment, School of Agricultural Sciences, Fitoko st. 1, 38446 Volos, Greece
- Agricultural Development Institute, University Research and Innovation Centre “IASON”, Argonafton & Filellinon, 38221, Greece
| | - Sotirios Vasileiadis
- Agricultural Development Institute, University Research and Innovation Centre “IASON”, Argonafton & Filellinon, 38221, Greece
- Department of Biochemistry and Biotechnology, Viopolis 41500, University of Thessaly, Larissa, Greece
| | - Amandine Caruana
- IFREMER, PHYTOX, Laboratoire PHYSALG, BP21105, Rue de l'Ile d'Yeu, F-44300 Nantes, France
| | - Dimitra-Ioli Skouroliakou
- Université du Littoral Côte d'Opale, CNRS, Université de Lille, UMR 8187 LOG, 32 Ave. Foch, F-62930 Wimereux, France
| | - Vasileios Bampouris
- Université du Littoral Côte d'Opale, CNRS, Université de Lille, UMR 8187 LOG, 32 Ave. Foch, F-62930 Wimereux, France
- Department of Ichthyology and Aquatic Environment, School of Agricultural Sciences, Fitoko st. 1, 38446 Volos, Greece
| | - Lucie Courcot
- Université du Littoral Côte d'Opale, CNRS, Université de Lille, UMR 8187 LOG, 32 Ave. Foch, F-62930 Wimereux, France
| | - Fabienne Hervé
- IFREMER, PHYTOX, Laboratoire PHYSALG, BP21105, Rue de l'Ile d'Yeu, F-44300 Nantes, France
| | - Muriel Crouvoisier
- Université du Littoral Côte d'Opale, CNRS, Université de Lille, UMR 8187 LOG, 32 Ave. Foch, F-62930 Wimereux, France
| | - Urania Christaki
- Université du Littoral Côte d'Opale, CNRS, Université de Lille, UMR 8187 LOG, 32 Ave. Foch, F-62930 Wimereux, France
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Liu F, Feng S, Ali Nasser Mansoor Al-Haimi A, Zhu S, Chen H, Feng P, Wang Z, Qin L. Discovery of two novel bioactive algicidal substances from Brevibacillus sp. via metabolomics profiling and back-validation. JOURNAL OF HAZARDOUS MATERIALS 2024; 469:133985. [PMID: 38471378 DOI: 10.1016/j.jhazmat.2024.133985] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2024] [Revised: 02/27/2024] [Accepted: 03/06/2024] [Indexed: 03/14/2024]
Abstract
Identifying potent bacterial algicidal agents is essential for the development of effective, safe, and economically viable algaecides. Challenges in isolating and purifying these substances from complex secretions have impeded progress in this field. Metabolomics profiling, an efficient strategy for identifying metabolites, was pioneered in identifying bacterial algicidal substances in this study. Extracellular secretions from different generations of the algicidal bacterium Brevibacillus sp. were isolated for comprehensive analysis. Specifically, a higher algicidal efficacy was observed in the secretion from Generation 3 (G3) of Brevibacillus sp. compared to Generation 1 (G1). Subsequent metabolomics profiling comparing G3 and 1 revealed 83 significantly up-regulated metabolites, of which 9 were identified as potential algicidal candidates. Back-validation highlighted the potency of 4-acetamidobutanoic acid (4-ABC) and 8-hydroxyquinoline (8-HQL), which exhibited robust algicidal activity with 3d-EC50 values of 6.40 mg/L and 92.90 µg/L, respectively. These substances disrupted photosynthetic activity in M. aeruginosa by ceasing electron transfer in PSⅡ, like the impact exerted by Brevibacillus sp. secretion. These findings confirmed that 4-ABC and 8-HQL were the main algicidal components derived from Brevibacillus sp.. Thus, this study presents a streamlined strategy for identifying bacterial algicidal substances and unveils two novel and highly active algicidal substances. ENVIRONMENTAL IMPLICATION: Harmful cyanobacterial blooms (HCBs) pose significant environmental problems and health effects to humans and other organisms. The increasing frequency of HCBs has emerged as a pressing global concern. Bacterial-derived algicidal substances are expected to serve as effective, safe, and economically viable algaecides against HCBs. This study presents a streamlined strategy for identifying bacterial algicidal substances and unveils two novel substances (4-ABC and 8-HQL). These two substances demonstrate remarkable algicidal activity and disrupt the photosynthetic system in M. aeruginosa. They hold potential as prospective algaecides for addressing HCBs.
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Affiliation(s)
- Fen Liu
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, PR China; CAS Key Laboratory of Renewable Energy, Guangzhou 510640, PR China; Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, PR China
| | - Siran Feng
- Center for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia
| | - Akram Ali Nasser Mansoor Al-Haimi
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, PR China; CAS Key Laboratory of Renewable Energy, Guangzhou 510640, PR China; Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, PR China
| | - Shunni Zhu
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, PR China; CAS Key Laboratory of Renewable Energy, Guangzhou 510640, PR China; Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, PR China
| | - Huanjun Chen
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, PR China; CAS Key Laboratory of Renewable Energy, Guangzhou 510640, PR China; Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, PR China
| | - Pingzhong Feng
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, PR China; CAS Key Laboratory of Renewable Energy, Guangzhou 510640, PR China; Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, PR China
| | - Zhongming Wang
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, PR China; CAS Key Laboratory of Renewable Energy, Guangzhou 510640, PR China; Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, PR China
| | - Lei Qin
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, PR China; CAS Key Laboratory of Renewable Energy, Guangzhou 510640, PR China; Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, PR China.
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Cai G, Yang X, Yu X, Zheng W, Cai R, Wang H. The novel application of violacein produced by a marine Duganella strain as a promising agent for controlling Heterosigma akashiwo bloom: Algicidal mechanism, fermentation optimization and agent formulation. JOURNAL OF HAZARDOUS MATERIALS 2024; 466:133548. [PMID: 38262320 DOI: 10.1016/j.jhazmat.2024.133548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Revised: 12/28/2023] [Accepted: 01/15/2024] [Indexed: 01/25/2024]
Abstract
Controlling harmful algal blooms with algicidal bacteria is thought to be an efficient and eco-friendly way but lack of comprehensive studies from theory to practice limited the field application. Here we presented a purple bacterial strain Duganella sp. A3 capable of killing several harmful algae, including Heterosigma akashiwo, a world-wide fish-killing microalga. A bioactivity-guided purification and identification approach revealed the major algicidal compound of A3 as the pigment violacein, which was never reported for its algicidal potential before. Violacein rapidly disrupted cell permeability, caused long-term oxidative stress, but mildly affected algal photosystem, which might explain its highly species-specific activity against unarmored H. akashiwo. To explore the application potential of violacein, a fermentation optimization approach combing single-factor and multi-factor experiments was conducted to increase the violacein yield, which finally reached 0.4199 g/L just using a simple medium formula beneficial for compound purification. Finally, taking advantages of the physical and chemical stabilities, we successfully developed the novel application of violacein as a sustained-releasing and easy-to-preserve algicidal agent using alginate-acacia-gum-chitosan encapsulation, which paved the path for its future application in controlling H. akashiwo bloom.
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Affiliation(s)
- Guanjing Cai
- Biology Department and Institute of Marine Sciences, College of Science, and Guangdong Provincial Key Laboratory of Marine Biotechnology, Shantou University, Shantou 515063, China.
| | - Xujun Yang
- Jimei University, Xiamen 361021, China; State Key Laboratory of Marine Environmental Science and Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, School of Life Sciences, Xiamen University, Xiamen 361005, China
| | - Xiaoqi Yu
- State Key Laboratory of Marine Environmental Science and Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, School of Life Sciences, Xiamen University, Xiamen 361005, China; Jimei Branch Xiamen Foreign Language School, Xiamen 361021, China
| | - Wei Zheng
- State Key Laboratory of Marine Environmental Science and Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, School of Life Sciences, Xiamen University, Xiamen 361005, China
| | - Runlin Cai
- Biology Department and Institute of Marine Sciences, College of Science, and Guangdong Provincial Key Laboratory of Marine Biotechnology, Shantou University, Shantou 515063, China
| | - Hui Wang
- Biology Department and Institute of Marine Sciences, College of Science, and Guangdong Provincial Key Laboratory of Marine Biotechnology, Shantou University, Shantou 515063, China
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