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Rahim NAA, Mohd Sidik Merican FM, Radzi R, Omar WMW, Nor SAM, Broady P, Convey P. Unveiling the Diversity of Periphytic Cyanobacteria (Cyanophyceae) from Tropical Mangroves in Penang, Malaysia. Trop Life Sci Res 2023; 34:57-94. [PMID: 37860087 PMCID: PMC10583846 DOI: 10.21315/tlsr2023.34.3.4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Accepted: 02/08/2023] [Indexed: 10/21/2023] Open
Abstract
Cyanobacteria are one of the most important groups of photoautotrophic organisms, contributing to carbon and nitrogen fixation in mangroves worldwide. They also play an important role in soil retention and stabilisation and contribute to high plant productivity through their secretion of plant growth-promoting substances. However, their diversity and distribution in Malaysian mangrove ecosystems have yet to be studied in detail, despite Malaysia hosting a significant element of remaining mangroves globally. In a floristic survey conducted in Penang, peninsular Malaysia, 33 morphospecies of periphytic cyanobacteria were identified and described for the first time from a mangrove ecosystem in Malaysia. Sixteen genera, comprising Aphanocapsa, Chroococcus, Chroococcidiopsis, Cyanobacterium, Desmonostoc, Geitlerinema, Leptolyngbya, Lyngbya, Microcystis, Myxosarcina, Oscillatoria, Phormidium, Pseudanabaena, Spirulina, Trichocoleus and Xenococcus, were obtained from field material growing on diverse natural and artificial substrata. Oscillatoriales was the dominant order with Phormidium the dominant genus at nine of the 15 sampling sites examined. Three of the morphospecies, Aphanocapsa cf. concharum, Xenococcus cf. pallidus and Oscillatoria pseudocurviceps, are rare and poorly known morphospecies worldwide. Chroococcus minutus, Phormidium uncinatum, P. amphigranulata, and some species of Oscillatoriales are considered as pollution indicator species. This study provides important baseline information for further investigation of the cyanobacterial microflora present in other mangrove areas around Malaysia. A complete checklist will enhance understanding of their ecological role and the potential for benefits arising from useful secondary metabolites or threats via toxin production to the ecosystem.
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Affiliation(s)
- Nur Afiqah Abdul Rahim
- School of Biological Sciences, Universiti Sains Malaysia, 11800 USM Pulau Pinang, Malaysia
| | | | - Ranina Radzi
- School of Biological Sciences, Universiti Sains Malaysia, 11800 USM Pulau Pinang, Malaysia
| | - Wan Maznah Wan Omar
- School of Biological Sciences, Universiti Sains Malaysia, 11800 USM Pulau Pinang, Malaysia
| | - Siti Azizah Mohd Nor
- Institute of Marine Biotechnology, Universiti Malaysia Terengganu, 21300 Kuala Terengganu, Terengganu, Malaysia
| | - Paul Broady
- School of Biological Sciences, University of Canterbury, 20 Kirkwood Avenue, Upper Riccarton, Christchurch 8041, New Zealand
| | - Peter Convey
- British Antarctic Survey, NERC, High Cross, Madingley Road, Cambridge CB3 0ET, United Kingdom
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Santoro M, Hassenrück C, Labrenz M, Hagemann M. Acclimation of Nodularia spumigena CCY9414 to inorganic phosphate limitation - Identification of the P-limitation stimulon via RNA-seq. Front Microbiol 2023; 13:1082763. [PMID: 36687591 PMCID: PMC9846622 DOI: 10.3389/fmicb.2022.1082763] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Accepted: 12/05/2022] [Indexed: 01/06/2023] Open
Abstract
Nodularia spumigena is a toxic, filamentous cyanobacterium capable of fixing atmospheric N2, which is often dominating cyanobacterial bloom events in the Baltic Sea and other brackish water systems worldwide. Increasing phosphate limitation has been considered as one environmental factor promoting cyanobacterial mass developments. In the present study, we analyzed the response of N. spumigena strain CCY9414 toward strong phosphate limitation. Growth of the strain was diminished under P-deplete conditions; however, filaments contained more polyphosphate under P-deplete compared to P-replete conditions. Using RNA-seq, gene expression was compared in N. spumigena CCY9414 after 7 and 14 days in P-deplete and P-replete conditions, respectively. After 7 days, 112 genes were significantly up-regulated in P-deplete filaments, among them was a high proportion of genes encoding proteins related to P-homeostasis such as transport systems for different P species. Many of these genes became also up-regulated after 14 days compared to 7 days in filaments grown under P-replete conditions, which was consistent with the almost complete consumption of dissolved P in these cultures after 14 days. In addition to genes directly related to P starvation, genes encoding proteins for bioactive compound synthesis, gas vesicles formation, or sugar catabolism were stimulated under P-deplete conditions. Collectively, our data describe an experimentally validated P-stimulon in N. spumigena CCY9414 and provide the indication that severe P limitation could indeed support bloom formation by this filamentous strain.
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Affiliation(s)
- Mariano Santoro
- Department of Biological Oceanography, Leibniz Institute for Baltic Sea Research, Warnemünde (IOW), Rostock, Germany,Department of Plant Physiology, Institute for Biosciences, University of Rostock, Rostock, Germany
| | - Christiane Hassenrück
- Department of Biological Oceanography, Leibniz Institute for Baltic Sea Research, Warnemünde (IOW), Rostock, Germany
| | - Matthias Labrenz
- Department of Biological Oceanography, Leibniz Institute for Baltic Sea Research, Warnemünde (IOW), Rostock, Germany
| | - Martin Hagemann
- Department of Plant Physiology, Institute for Biosciences, University of Rostock, Rostock, Germany,*Correspondence: Martin Hagemann,
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Thuret-Benoist H, Pallier V, Feuillade-Cathalifaud G. Monitoring of the impact of the proliferations of cyanobacteria on the characteristics of Natural Organic Matter in a eutrophic water resource: Comparison between 2012-2013 and 2017-2018. CHEMOSPHERE 2022; 291:132834. [PMID: 34762893 DOI: 10.1016/j.chemosphere.2021.132834] [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: 02/09/2021] [Revised: 11/02/2021] [Accepted: 11/07/2021] [Indexed: 06/13/2023]
Abstract
The natural surface waters are widely impacted by the seasonal blooms of phytoplankton and in water rich in nutrients their developments are controlled by the climate. These proliferations modify the global quality of the water resources and the Algal Organic Matter (AOM) produced by the algae and the cyanobacteria impacts the content and the characteristics of the Natural Organic Matter (NOM). However, none study deals with the sustainable influence of the recurrent seasonal blooms of phytoplankton on the chemical quality of the water resources. The physico-chemical, chemical and biological quality of a water resource and more specifically the content and the characteristics of the NOM were thus in situ monitored in a eutrophic pond in 2017-2018 and compared to the characteristics observed in 2012-2013. The blooms of phytoplankton were more important in 2017-2018 and the increase of both the temperature of the air and the radiance promoted the domination of cyanobacteria. None significant evolution of the content in chlorophyll-a, the concentrations in nutrients and the pH was observed between 2012-2013 and 2017-2018. However, the concentrations in DOC increased, more in summer periods than winter, because of the production of AOM by the algae and the cyanobacteria and the NOM presented more hydrophilic and less aromatic characters. These evolutions of the characteristics of the NOM were more important in 2017-2018 than 2012-2013. The recurrent inputs of AOM every year in summer periods seemed thus to sustainably modify the intrinsic characteristics of the NOM.
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Affiliation(s)
- Hélène Thuret-Benoist
- University of Limoges, Laboratory PEIRENE, EA 7500, ENSIL-ENSCI, 16 Rue Atlantis, 87068, Limoges, Cedex, France
| | - Virginie Pallier
- University of Limoges, Laboratory PEIRENE, EA 7500, ENSIL-ENSCI, 16 Rue Atlantis, 87068, Limoges, Cedex, France
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Vione D, Rosario-Ortiz FL. Foreseen Effects of Climate-Impacted Scenarios on the Photochemical Fate of Selected Cyanotoxins in Surface Freshwaters. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:10928-10934. [PMID: 34342987 PMCID: PMC8384231 DOI: 10.1021/acs.est.1c03440] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Indexed: 06/13/2023]
Abstract
Cyanobacteria populate most water environments, and their ability to effectively exploit light and nutrients provide them with a competitive advantage over other life forms. In particular conditions, cyanobacteria may experience considerable growth and give rise to the so-called harmful algal blooms (HABs). HABs are often characterized by the production of cyanotoxins, which cause adverse effects to both aquatic organisms and humans and even threaten drinking water supplies. The concentration of cyanotoxins in surface waters results from the budget between production by cyanobacteria and transformation, including photodegradation under sunlight exposure. Climate change will likely provide favorable conditions for HABs, which are expected to increase in frequency over both space and time. Moreover, climate change could modify the ability of some surface waters to induce phototransformation reactions. Photochemical modeling is here carried out for two cyanotoxins of known photoreaction kinetics (microcystin-LR and cylindrospermopsin), which follow different phototransformation pathways and for particular freshwater scenarios (summertime stratification in lakes, water browning, and evaporative water concentration). On this basis, it is possible to quantitatively predict that the expected changes in water-column conditions under a changing climate would enhance photodegradation of those cyanotoxins that are significantly transformed by reaction with the triplet states of chromophoric dissolved organic matter (3CDOM*). This is known to be the case for microcystin-LR, for which faster photodegradation in some environments would at least partially offset enhanced occurrence. Unfortunately, very few data are currently available for the role of 3CDOM* in the degradation of other cyanotoxins, which is a major knowledge gap in understanding the link between cyanotoxin photodegradation and changing climate.
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Affiliation(s)
- Davide Vione
- Dipartimento
di Chimica, Università degli Studi
di Torino, Via Pietro Giuria 5, 10125 Torino, Italy
| | - Fernando L. Rosario-Ortiz
- Department
of Civil, Environmental, and Architectural Engineering, University of Colorado Boulder, 1111 Engineering Drive, 428 UCB, Boulder, Colorado 80309, United States
- Environmental
Engineering Program, University of Colorado
Boulder, Boulder, Colorado 80309, United States
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Saravanan A, Senthil kumar P, Vo DVN, Jeevanantham S, Bhuvaneswari V, Anantha Narayanan V, Yaashikaa P, Swetha S, Reshma B. A comprehensive review on different approaches for CO2 utilization and conversion pathways. Chem Eng Sci 2021. [DOI: 10.1016/j.ces.2021.116515] [Citation(s) in RCA: 43] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Algal Toxic Compounds and Their Aeroterrestrial, Airborne and other Extremophilic Producers with Attention to Soil and Plant Contamination: A Review. Toxins (Basel) 2021; 13:toxins13050322. [PMID: 33946968 PMCID: PMC8145420 DOI: 10.3390/toxins13050322] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2021] [Revised: 04/27/2021] [Accepted: 04/27/2021] [Indexed: 12/16/2022] Open
Abstract
The review summarizes the available knowledge on toxins and their producers from rather disparate algal assemblages of aeroterrestrial, airborne and other versatile extreme environments (hot springs, deserts, ice, snow, caves, etc.) and on phycotoxins as contaminants of emergent concern in soil and plants. There is a growing body of evidence that algal toxins and their producers occur in all general types of extreme habitats, and cyanobacteria/cyanoprokaryotes dominate in most of them. Altogether, 55 toxigenic algal genera (47 cyanoprokaryotes) were enlisted, and our analysis showed that besides the “standard” toxins, routinely known from different waterbodies (microcystins, nodularins, anatoxins, saxitoxins, cylindrospermopsins, BMAA, etc.), they can produce some specific toxic compounds. Whether the toxic biomolecules are related with the harsh conditions on which algae have to thrive and what is their functional role may be answered by future studies. Therefore, we outline the gaps in knowledge and provide ideas for further research, considering, from one side, the health risk from phycotoxins on the background of the global warming and eutrophication and, from the other side, the current surge of interest which phycotoxins provoke due to their potential as novel compounds in medicine, pharmacy, cosmetics, bioremediation, agriculture and all aspects of biotechnological implications in human life.
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Kurtz T, Zeng T, Rosario-Ortiz FL. Photodegradation of cyanotoxins in surface waters. WATER RESEARCH 2021; 192:116804. [PMID: 33494040 DOI: 10.1016/j.watres.2021.116804] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Revised: 12/15/2020] [Accepted: 12/31/2020] [Indexed: 06/12/2023]
Abstract
Cyanotoxin-producing harmful algal blooms (HABs) are a global occurrence and pose ecotoxicological threats to humans and animals alike. The presence of cyanotoxins can seriously harm or kill nearby wildlife and restrict a body of water's use as a drinking water supply and recreational site, making it imperative to fully understand their fate and transport in natural waters. Photodegradation contributes to the overall degradation of cyanotoxins in environmental systems, especially for those present in the photic zone of surface waters. This makes photochemical transformation mechanisms important factors to account for when assessing the persistence of cyanotoxins in environmental systems. This paper reviews current knowledge on the photodegradation rates and pathways of cyanotoxins that can occur over the course of HABs. Sensitized, or indirect, photolysis contributes to the degradation of all cyanotoxins addressed in this paper (anatoxins, cylindrospermopsins, domoic acids, microcystins, and nodularins), with hydroxyl radicals (•OH), excited triplet states formed from the absorption of light by dissolved organic matter (3DOM*), and photosynthetic pigment sensitized pathways being of primary interest. Direct photolysis pathways play a less significant role, but are still relevant for most of the cyanotoxins discussed in this paper.
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Affiliation(s)
- Tyler Kurtz
- Department of Civil, Environmental, and Architectural Engineering, University of Colorado Boulder, Colorado 80309, United States; Environmental Engineering Program, University of Colorado Boulder, Colorado 80309, United States
| | - Teng Zeng
- Department of Civil and Environmental Engineering, 151 Link Hall, Syracuse University, Syracuse, NY 13244, United States
| | - Fernando L Rosario-Ortiz
- Department of Civil, Environmental, and Architectural Engineering, University of Colorado Boulder, Colorado 80309, United States; Environmental Engineering Program, University of Colorado Boulder, Colorado 80309, United States.
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Zhang H, Huo S, Xiao Z, He Z, Yang J, Yeager KM, Li X, Wu F. Climate and Nutrient-Driven Regime Shifts of Cyanobacterial Communities in Low-Latitude Plateau Lakes. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:3408-3418. [PMID: 33587626 DOI: 10.1021/acs.est.0c05234] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Cyanobacterial blooms that form in response to climate warming and nutrient enrichment in freshwater lakes have become a global environmental challenge. Historical legacy effects and the mechanisms underlying cyanobacterial community succession are not well understood, especially for plateau lakes that are important global freshwater resources. This study investigated the temporal dynamics of cyanobacterial communities over centuries in response to nutrient enrichment and climate warming in low-latitude plateau lakes using high-throughput DNA sequencing of sedimentary DNA combined with traditional paleolimnological analyses. Our results confirmed that nutrients and climate warming drive shifts in cyanobacterial communities over time. Cyanobacterial community turnover was pronounced with regime shifts toward new ecological states, occurring after exceeding a tipping point of aquatic total phosphorus (TP). The inferred species interactions, niche differentiation, and identity of keystone taxa significantly changed after crossing the aquatic TP ecological threshold, as demonstrated by network analysis of cyanobacterial taxa. Further, the contribution of aquatic TP to cyanobacterial community dynamics was greater than that of air temperature when lakes were in an oligotrophic state. In contrast, as the aquatic TP threshold was exceeded, the contribution to community dynamics by air temperature increased and potentially surpassed that of aquatic TP. Overall, these results provide new evidence for how past nutrient levels in lacustrine ecosystems influence contemporary cyanobacterial community responses to global warming in low-latitude plateau lakes.
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Affiliation(s)
- Hanxiao Zhang
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
- College of Water Sciences, Beijing Normal University, Beijing 100012, China
| | - Shouliang Huo
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
- College of Water Sciences, Beijing Normal University, Beijing 100012, China
| | - Zhe Xiao
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Zhuoshi He
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Jun Yang
- Aquatic EcoHealth Group, Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
| | - Kevin M Yeager
- Department Earth and Environmental Sciences, University of Kentucky, Lexington, Kentucky 40506, United States
| | - Xiaochuang Li
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Fengchang Wu
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
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Song Q, Niu X, Zhang D, Song X, Li Y, Ma J, Lai S, Yang Z, Zhou S. The behaviors of Microcystis aeruginosa and microcystins during the Fe 2+/persulfate (PS) preoxidation-coagulation and flocs storage period. ENVIRONMENTAL RESEARCH 2020; 186:109549. [PMID: 32325291 DOI: 10.1016/j.envres.2020.109549] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2020] [Revised: 04/11/2020] [Accepted: 04/15/2020] [Indexed: 06/11/2023]
Abstract
The frequent occurrence of toxin-producing cyanobacteria blooms driven by anthropogenic eutrophication has become a major threat to aquaculture ecosystems worldwide. In this study, the behavior of M. aeruginosa cells during flocs storage period of 6 days was first investigated after pre-oxidation and coagulation of Fe2+/PS. Fe2+/PS achieved a superior removal efficiency of 90.7% for OD680 and 90.4% for chl-a. The contents of extracellular MCs in the pre-oxidation and coagulation system were significantly (P < 0.05) lower than those in the control. A significant (P < 0.05) difference in intracellular protein between the control and the coagulated systems was observed. Three-dimensional fluorescence excitation emission matrix (EEM) was employed to investigate the variations in extracellular organic matter (EOM) during flocs storage. The results indicated the presence of four peaks, representing protein-like substances, intermediate dissolved microbial metabolites, fulvic and humic-like compounds in the Fe2+/PS process. And the intensities of four peaks were all decreased in the Fe2+/PS system compared to those in the control. A low level of accumulated residual Fe of 0.28 mg/L was observed without posing potential environmental risk. The results showed that the M. aeruginosa cells were under stressful conditions after 3-d storage due to the decomposition of extracellular polymeric substances (EPSs) and the insufficient supply of nutrients. However, SEM results indicated that no significant alteration in cell morphology was observed. Therefore, with high removal of M. aeruginosa, low MCs concentrations, and trivial cell damage, the Fe2+/PS preoxidation-coagulation was proved to be an environmental-friendly method for cyanobacteria removal without yielding serious secondary pollution. This work will contribute to better understanding and managing the cyanobacteria-laden aquaculture water after pre-oxidation and coagulation.
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Affiliation(s)
- Qi Song
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
| | - Xiaojun Niu
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China; School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming, 525000, China; State Key Laboratory of Pollution Control and Resource Reuse, Nanjing, 210093, China; Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, Guangzhou, 510640, China.
| | - Dongqing Zhang
- School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming, 525000, China.
| | - Xiaofei Song
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
| | - Yankun Li
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
| | - Jinling Ma
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
| | - Senchao Lai
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
| | - Zhiquan Yang
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
| | - Shaoqi Zhou
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
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Paerl HW, Barnard MA. Mitigating the global expansion of harmful cyanobacterial blooms: Moving targets in a human- and climatically-altered world. HARMFUL ALGAE 2020; 96:101845. [PMID: 32560828 PMCID: PMC7334832 DOI: 10.1016/j.hal.2020.101845] [Citation(s) in RCA: 61] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Revised: 05/23/2020] [Accepted: 05/24/2020] [Indexed: 05/03/2023]
Abstract
Cyanobacterial harmful algal blooms (CyanoHABs) are a major threat to human and environmental health. As global proliferation of CyanoHABs continues to increase in prevalence, intensity, and toxicity, it is important to identify and integrate the underlying causes and controls of blooms in order to develop effective short- and long-term mitigation strategies. Clearly, nutrient input reductions should receive high priority. Legacy effects of multi-decadal anthropogenic eutrophication have altered limnetic systems such that there has been a shift from exclusive phosphorus (P) limitation to nitrogen (N) limitation and N and P co-limitation. Additionally, climate change is driving CyanoHAB proliferation through increasing global temperatures and altered precipitation patterns, including more extreme rainfall events and protracted droughts. These scenarios have led to the "perfect storm scenario"; increases in pulsed nutrient loading events, followed by persistent low-flow, long water residence times, favoring bloom formation and proliferation. To meet the CyanoHAB mitigation challenge, we must: (1) Formulate watershed and airshed-specific N and P input reductions on a sliding scale to meet anthropogenic and climatic forcings. (2) Develop CyanoHAB management strategies that incorporate current and anticipated climatic changes and extremes. (3) Make nutrient management strategies compatible with other physical-chemical-biological mitigation approaches, such as altering freshwater flow and flushing, dredging, chemical applications, introduction of selective grazers, etc. (4) Target CyanoHAB toxin production and developing management approaches to reduce toxin production. (5) Develop broadly applicable long-term strategies that incorporate the above recommendations.
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Affiliation(s)
- Hans W Paerl
- Institute of Marine Sciences, University of North Carolina at Chapel Hill, 3431 Arendell St, Morehead City, NC, USA.
| | - Malcolm A Barnard
- Institute of Marine Sciences, University of North Carolina at Chapel Hill, 3431 Arendell St, Morehead City, NC, USA.
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Su X, Sutarlie L, Loh XJ. Sensors, Biosensors, and Analytical Technologies for Aquaculture Water Quality. RESEARCH (WASHINGTON, D.C.) 2020; 2020:8272705. [PMID: 32149280 PMCID: PMC7048950 DOI: 10.34133/2020/8272705] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/28/2019] [Accepted: 01/08/2020] [Indexed: 12/20/2022]
Abstract
In aquaculture industry, fish, shellfish, and aquatic plants are cultivated in fresh, salt, or brackish waters. The increasing demand of aquatic products has stimulated the rapid growth of aquaculture industries. How to effectively monitor and control water quality is one of the key concerns for aquaculture industry to ensure high productivity and high quality. There are four major categories of water quality concerns that affect aquaculture cultivations, namely, (1) physical parameters, e.g., pH, temperature, dissolved oxygen, and salinity, (2) organic contaminants, (3) biochemical hazards, e.g., cyanotoxins, and (4) biological contaminants, i.e., pathogens. While the physical parameters are affected by climate changes, the latter three are considered as environmental factors. In this review, we provide a comprehensive summary of sensors, biosensors, and analytical technologies available for monitoring aquaculture water quality. They include low-cost commercial sensors and sensor network setups for physical parameters. They also include chromatography, mass spectrometry, biochemistry, and molecular methods (e.g., immunoassays and polymerase chain reaction assays), culture-based method, and biophysical technologies (e.g., biosensors and nanosensors) for environmental contamination factors. According to the different levels of sophistication of various analytical techniques and the information they can provide (either fine fingerprint, highly accurate quantification, semiquantification, qualitative detection, or fast screening), we will comment on how they may be used as complementary tools, as well as their potential and gaps toward current demand of real-time, online, and/or onsite detection.
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Affiliation(s)
- Xiaodi Su
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research, 2 Fusionopolis Way. Innovis #08-03, Singapore 138634
- Department of Chemistry, National University of Singapore, Block S8, Level 3, 3 Science Drive 3, Singapore 117543
| | - Laura Sutarlie
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research, 2 Fusionopolis Way. Innovis #08-03, Singapore 138634
| | - Xian Jun Loh
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research, 2 Fusionopolis Way. Innovis #08-03, Singapore 138634
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Batista AMM, Figueredo CC, Giani A. Variability in a permanent cyanobacterial bloom: species-specific responses to environmental drivers. FEMS Microbiol Ecol 2019; 94:5115560. [PMID: 30289447 DOI: 10.1093/femsec/fiy197] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Accepted: 10/02/2018] [Indexed: 11/12/2022] Open
Abstract
Cyanobacterial blooms are characterized by intense growth of one or few species that will dominate the phytoplankton community for periods of few months to an entire year or more. However, even during persistent blooms, important seasonal changes among dominant species can be observed. Pampulha reservoir is a tropical eutrophic reservoir presenting permanent blooms. To identify the main species in this environment, a closer analysis performed by microscopy and 16S-rRNA DGGE revealed Cylindrospermopsis raciborskii as highly dominant throughout the year. The second most abundant group comprised species belonging to the Microcystis genus. They followed a well-defined seasonal pattern described by interesting species-specific ecological trends. During thermal stratification in the rainy/warmer season, C. raciborskii dominated in the water column, while Microcystis spp. were abundant at the end of the dry season, a period characterized by higher total phosphorus concentrations. Phylogenetic analyses confirmed the two dominant taxa and their seasonal trends. The results showed that cyanobacteria major controlling factors were strongly species dependent, shifting from physical/climate related (stratification) to more chemical driven (nutrients/eutrophication). Identifying these drivers is therefore essential for the understanding of the bloom dynamics and the real risks associated with each species, and to eventually adopt the most appropriate and effective management strategies.
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Affiliation(s)
- A M M Batista
- Department of Botany, ICB, Universidade Federal de Minas Gerais, Belo Horizonte 31270-010, Brazil
| | - C C Figueredo
- Department of Botany, ICB, Universidade Federal de Minas Gerais, Belo Horizonte 31270-010, Brazil
| | - A Giani
- Department of Botany, ICB, Universidade Federal de Minas Gerais, Belo Horizonte 31270-010, Brazil
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Sarkar S, Kimono D, Albadrani M, Seth RK, Busbee P, Alghetaa H, Porter DE, Scott GI, Brooks B, Nagarkatti M, Nagarkatti P, Chatterjee S. Environmental microcystin targets the microbiome and increases the risk of intestinal inflammatory pathology via NOX2 in underlying murine model of Nonalcoholic Fatty Liver Disease. Sci Rep 2019; 9:8742. [PMID: 31217465 PMCID: PMC6584534 DOI: 10.1038/s41598-019-45009-1] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Accepted: 05/24/2019] [Indexed: 02/06/2023] Open
Abstract
With increased climate change pressures likely to influence harmful algal blooms, exposure to microcystin, a known hepatotoxin and a byproduct of cyanobacterial blooms can be a risk factor for NAFLD associated comorbidities. Using both in vivo and in vitro experiments we show that microcystin exposure in NAFLD mice cause rapid alteration of gut microbiome, rise in bacterial genus known for mediating gut inflammation and lactate production. Changes in the microbiome were strongly associated with inflammatory pathology in the intestine, gut leaching, tight junction protein alterations and increased oxidative tyrosyl radicals. Increased lactate producing bacteria from the altered microbiome was associated with increased NOX-2, an NADPH oxidase isoform. Activationof NOX2 caused inflammasome activation as shown by NLRP3/ASCII and NLRP3/Casp-1 colocalizations in these cells while use of mice lacking a crucial NOX2 component attenuated inflammatory pathology and redox changes. Mechanistically, NOX2 mediated peroxynitrite species were primary to inflammasome activation and release of inflammatory mediators. Thus, in conclusion, microcystin exposure in NAFLD could significantly alter intestinal pathology especially by the effects on microbiome and resultant redox status thus advancing our understanding of the co-existence of NAFLD-linked inflammatory bowel disease phenotypes in the clinic.
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Affiliation(s)
- Sutapa Sarkar
- Environmental Health and Disease Laboratory, Department of Environmental Health Sciences, University of South Carolina, Columbia, USA
- NIEHS Center for Oceans and Human Health on Climate Change Interactions, Department of Environmental Health Sciences, University of South Carolina, Columbia, USA
| | - Diana Kimono
- Environmental Health and Disease Laboratory, Department of Environmental Health Sciences, University of South Carolina, Columbia, USA
- NIEHS Center for Oceans and Human Health on Climate Change Interactions, Department of Environmental Health Sciences, University of South Carolina, Columbia, USA
| | - Muayad Albadrani
- Environmental Health and Disease Laboratory, Department of Environmental Health Sciences, University of South Carolina, Columbia, USA
- NIEHS Center for Oceans and Human Health on Climate Change Interactions, Department of Environmental Health Sciences, University of South Carolina, Columbia, USA
| | - Ratanesh K Seth
- Environmental Health and Disease Laboratory, Department of Environmental Health Sciences, University of South Carolina, Columbia, USA
- NIEHS Center for Oceans and Human Health on Climate Change Interactions, Department of Environmental Health Sciences, University of South Carolina, Columbia, USA
| | - Philip Busbee
- Pathology, Microbiology and Immunology, University of South Carolina School of Medicine, Columbia, USA
| | - Hasan Alghetaa
- Pathology, Microbiology and Immunology, University of South Carolina School of Medicine, Columbia, USA
| | - Dwayne E Porter
- NIEHS Center for Oceans and Human Health on Climate Change Interactions, Department of Environmental Health Sciences, University of South Carolina, Columbia, USA
| | - Geoff I Scott
- NIEHS Center for Oceans and Human Health on Climate Change Interactions, Department of Environmental Health Sciences, University of South Carolina, Columbia, USA
| | - Bryan Brooks
- Department of Environmental Science, Baylor University, Waco, USA
| | - Mitzi Nagarkatti
- Pathology, Microbiology and Immunology, University of South Carolina School of Medicine, Columbia, USA
| | - Prakash Nagarkatti
- Pathology, Microbiology and Immunology, University of South Carolina School of Medicine, Columbia, USA
| | - Saurabh Chatterjee
- Environmental Health and Disease Laboratory, Department of Environmental Health Sciences, University of South Carolina, Columbia, USA.
- NIEHS Center for Oceans and Human Health on Climate Change Interactions, Department of Environmental Health Sciences, University of South Carolina, Columbia, USA.
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14
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Clark GC, Casewell NR, Elliott CT, Harvey AL, Jamieson AG, Strong PN, Turner AD. Friends or Foes? Emerging Impacts of Biological Toxins. Trends Biochem Sci 2019; 44:365-379. [PMID: 30651181 DOI: 10.1016/j.tibs.2018.12.004] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Revised: 11/21/2018] [Accepted: 12/07/2018] [Indexed: 12/19/2022]
Abstract
Toxins are substances produced from biological sources (e.g., animal, plants, microorganisms) that have deleterious effects on a living organism. Despite the obvious health concerns of being exposed to toxins, they are having substantial positive impacts in a number of industrial sectors. Several toxin-derived products are approved for clinical, veterinary, or agrochemical uses. This review sets out the case for toxins as 'friends' that are providing the basis of novel medicines, insecticides, and even nucleic acid sequencing technologies. We also discuss emerging toxins ('foes') that are becoming increasingly prevalent in a range of contexts through climate change and the globalisation of food supply chains and that ultimately pose a risk to health.
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Affiliation(s)
- Graeme C Clark
- CBR Division, Defence Science & Technology Laboratory, DSTL - Porton Down, Salisbury, Wiltshire, SP4 0JQ, UK.
| | - Nicholas R Casewell
- Centre for Snakebite Research & Interventions, Liverpool School of Tropical Medicine, Pembroke Place, Liverpool L3 5QA, UK
| | - Christopher T Elliott
- Institute for Global Food Security, School of Biological Sciences, Queen's University, Belfast, 97 Lisburn Road, Belfast, BT9 7BL, UK
| | - Alan L Harvey
- Strathclyde Institute of Pharmacy & Biomedical Sciences, University of Strathclyde, 161 Cathedral Street, Glasgow, G4 0RE, UK
| | - Andrew G Jamieson
- School of Chemistry, Joseph Black Building, University of Glasgow, Glasgow, G12 8QQ, UK
| | - Peter N Strong
- Biomolecular Research Centre, Department of Biosciences and Chemistry, Sheffield Hallam University, Sheffield, S1 1WB, UK
| | - Andrew D Turner
- Food Safety Group, Cefas, Barrack Road, The Nothe, Weymouth, Dorset DT4 8UB, UK
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15
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Nitrogen limitation, toxin synthesis potential, and toxicity of cyanobacterial populations in Lake Okeechobee and the St. Lucie River Estuary, Florida, during the 2016 state of emergency event. PLoS One 2018; 13:e0196278. [PMID: 29791446 PMCID: PMC5965861 DOI: 10.1371/journal.pone.0196278] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Accepted: 04/10/2018] [Indexed: 11/19/2022] Open
Abstract
Lake Okeechobee, FL, USA, has been subjected to intensifying cyanobacterial blooms that can spread to the adjacent St. Lucie River and Estuary via natural and anthropogenically-induced flooding events. In July 2016, a large, toxic cyanobacterial bloom occurred in Lake Okeechobee and throughout the St. Lucie River and Estuary, leading Florida to declare a state of emergency. This study reports on measurements and nutrient amendment experiments performed in this freshwater-estuarine ecosystem (salinity 0–25 PSU) during and after the bloom. In July, all sites along the bloom exhibited dissolved inorganic nitrogen-to-phosphorus ratios < 6, while Microcystis dominated (> 95%) phytoplankton inventories from the lake to the central part of the estuary. Chlorophyll a and microcystin concentrations peaked (100 and 34 μg L-1, respectively) within Lake Okeechobee and decreased eastwards. Metagenomic analyses indicated that genes associated with the production of microcystin (mcyE) and the algal neurotoxin saxitoxin (sxtA) originated from Microcystis and multiple diazotrophic genera, respectively. There were highly significant correlations between levels of total nitrogen, microcystin, and microcystin synthesis gene abundance across all surveyed sites (p < 0.001), suggesting high levels of nitrogen supported the production of microcystin during this event. Consistent with this, experiments performed with low salinity water from the St. Lucie River during the event indicated that algal biomass was nitrogen-limited. In the fall, densities of Microcystis and concentrations of microcystin were significantly lower, green algae co-dominated with cyanobacteria, and multiple algal groups displayed nitrogen-limitation. These results indicate that monitoring and regulatory strategies in Lake Okeechobee and the St. Lucie River and Estuary should consider managing loads of nitrogen to control future algal and microcystin-producing cyanobacterial blooms.
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16
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Proteomic evidences for microcystin-RR-induced toxicological alterations in mice liver. Sci Rep 2018; 8:1310. [PMID: 29358693 PMCID: PMC5778043 DOI: 10.1038/s41598-018-19299-w] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Accepted: 12/29/2017] [Indexed: 02/07/2023] Open
Abstract
This study deals with the isolation and purification of an important variant of microcystins namely microcystin-RR (MCYST-RR) from Microcystis aeruginosa and reports its effects on mice liver protein profile and cellular functions. Protein profiling by 2-dimensional gel electrophoresis revealed changes in the number and accumulation of protein spots in liver of mice treated with different concentrations of MCYST-RR. Untreated (control) mice liver showed 368 protein spots while the number was 355, 348 and 332 in liver of mice treated with 200, 300 and 400 µg kg body wt−1 of MCYST-RR respectively. Altogether 102, 97, and 92 spots were differentially up-accumulated and 93, 91, and 87 spots were down- accumulated respectively with the treatment of 200, 300, 400 µg kg body wt−1. Eighteen differentially accumulated proteins present in all the four conditions were identified by MALDI-TOF MS. Of these eighteen proteins, 12 appeared to be involved in apoptosis/toxicological manifestations. Pathway analysis by Reactome and PANTHER database also mapped the identified proteins to programmed cell death/apoptosis clade. That MCYST-RR induces apoptosis in liver tissues was also confirmed by DNA fragmentation assay. Results of this study elucidate the proteomic basis for the hepatotoxicity of MCYST-RR which is otherwise poorly understood till date.
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17
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Yan X, Xu X, Wang M, Wang G, Wu S, Li Z, Sun H, Shi A, Yang Y. Climate warming and cyanobacteria blooms: Looks at their relationships from a new perspective. WATER RESEARCH 2017; 125:449-457. [PMID: 28898702 DOI: 10.1016/j.watres.2017.09.008] [Citation(s) in RCA: 101] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Revised: 08/05/2017] [Accepted: 09/03/2017] [Indexed: 06/07/2023]
Abstract
Climate warming and eutrophication are regarded as two important contributors to the occurrence of cyanobacteria blooms in aquatic ecosystems. However, the feedback of cyanobacteria blooms to climate warming and eutrophication is not fully clear. In this study, a microcosm system was established to simulate the decomposition processes of cyanobacteria blooms. It was observed that a large amount of nitrogen and phosphorus was released into the overlying water, and the concentrations of nitrogen and phosphorus were increased with the amount of added cyanobacteria bloom biomass addition. Subsequently, these released nutrients became available for primary production and intensified the eutrophic state of freshwater lakes. During the decomposition of cyanobacteria blooms, the microenvironment acquired low DO, low pH, and reductive conditions. Together with abundant organic matter in the water column and sediment, a large amount of CH4 and CO2 produced through organic matter mineralization, in which CH4 was the dominant fraction, occupied 50%-92% in mass of emitted carbon. Furthermore, a certain amount of N2O, probably underestimated, was produced with a strong greenhouse effect, even though its magnitude was small. These observations clarify that the feedbacks among cyanobacteria blooms formation and climate warming as well as the eutrophication of freshwater lakes are not unidirectional, but bidirectional. Given that climate warming enhanced the occurrence of cyanobacteria blooms, it was proposed that there are two vicious loops between cyanobacteria blooms, lake eutrophication and climate warming, which should be considered in the future management of aquatic ecosystems.
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Affiliation(s)
- Xingcheng Yan
- School of Environment, Nanjing Normal University, 210023 Nanjing, China
| | - Xiaoguang Xu
- School of Environment, Nanjing Normal University, 210023 Nanjing, China.
| | - Mingyue Wang
- School of Environment, Nanjing Normal University, 210023 Nanjing, China
| | - Guoxiang Wang
- School of Environment, Nanjing Normal University, 210023 Nanjing, China.
| | - Songjun Wu
- School of Environment, Nanjing Normal University, 210023 Nanjing, China
| | - Zhichun Li
- School of Environment, Nanjing Normal University, 210023 Nanjing, China
| | - Hao Sun
- School of Environment, Nanjing Normal University, 210023 Nanjing, China
| | - Ao Shi
- School of Environment, Nanjing Normal University, 210023 Nanjing, China
| | - Yunhao Yang
- School of Environment, Nanjing Normal University, 210023 Nanjing, China
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18
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Melina Celeste CM, Lorena R, Jorge Oswaldo A, Sandro G, Daniela S, Dario A, Leda G. Mathematical modeling of Microcystis aeruginosa growth and [D-Leu 1] microcystin-LR production in culture media at different temperatures. HARMFUL ALGAE 2017; 67:13-25. [PMID: 28755715 DOI: 10.1016/j.hal.2017.05.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2016] [Revised: 05/11/2017] [Accepted: 05/13/2017] [Indexed: 05/16/2023]
Abstract
The effect of temperature (26°C, 28°C, 30°C and 35°C) on the growth of native CAAT-3-2005 Microcystis aeruginosa and the production of Chlorophyll-a (Chl-a) and Microcystin-LR (MC-LR) were examined through laboratory studies. Kinetic parameters such as specific growth rate (μ), lag phase duration (LPD) and maximum population density (MPD) were determined by fitting the modified Gompertz equation to the M. aeruginosa strain cell count (cellsmL-1). A 4.8-fold increase in μ values and a 10.8-fold decrease in the LPD values were found for M. aeruginosa growth when the temperature changed from 15°C to 35°C. The activation energy of the specific growth rate (Eμ) and of the adaptation rate (E1/LPD) were significantly correlated (R2=0.86). The cardinal temperatures estimated by the modified Ratkowsky model were minimum temperature=8.58±2.34°C, maximum temperature=45.04±1.35°C and optimum temperature=33.39±0.55°C. Maximum MC-LR production decreased 9.5-fold when the temperature was increased from 26°C to 35°C. The maximum production values were obtained at 26°C and the maximum depletion rate of intracellular MC-LR was observed at 30-35°C. The MC-LR cell quota was higher at 26 and 28°C (83 and 80fgcell-1, respectively) and the MC-LR Chl-a quota was similar at all the different temperatures (0.5-1.5fgng-1). The Gompertz equation and dynamic model were found to be the most appropriate approaches to calculate M. aeruginosa growth and production of MC-LR, respectively. Given that toxin production decreased with increasing temperatures but growth increased, this study demonstrates that growth and toxin production processes are uncoupled in M. aeruginosa. These data and models may be useful to predict M. aeruginosa bloom formation in the environment.
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Affiliation(s)
- Crettaz Minaglia Melina Celeste
- Area de Toxicología, Facultad de Ciencias Exactas, Universidad Nacional de La Plata (UNLP-CONICET), La Plata, 48 y 115, 1900, Argentina
| | - Rosso Lorena
- Area de Toxicología, Facultad de Ciencias Exactas, Universidad Nacional de La Plata (UNLP-CONICET), La Plata, 48 y 115, 1900, Argentina
| | - Aranda Jorge Oswaldo
- Area de Toxicología, Facultad de Ciencias Exactas, Universidad Nacional de La Plata (UNLP-CONICET), La Plata, 48 y 115, 1900, Argentina
| | - Goñi Sandro
- Centro de Investigación y Desarrollo en Criotecnología de Alimentos (CIDCA-CONICET), La Plata, 47 y 116, 1900, Argentina
| | - Sedan Daniela
- Area de Toxicología, Facultad de Ciencias Exactas, Universidad Nacional de La Plata (UNLP-CONICET), La Plata, 48 y 115, 1900, Argentina
| | - Andrinolo Dario
- Area de Toxicología, Facultad de Ciencias Exactas, Universidad Nacional de La Plata (UNLP-CONICET), La Plata, 48 y 115, 1900, Argentina
| | - Giannuzzi Leda
- Area de Toxicología, Facultad de Ciencias Exactas, Universidad Nacional de La Plata (UNLP-CONICET), La Plata, 48 y 115, 1900, Argentina; Centro de Investigación y Desarrollo en Criotecnología de Alimentos (CIDCA-CONICET), La Plata, 47 y 116, 1900, Argentina.
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19
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Dunker S, Althammer J, Pohnert G, Wilhelm C. A Fateful Meeting of Two Phytoplankton Species-Chemical vs. Cell-Cell-Interactions in Co-Cultures of the Green Algae Oocystis marsonii and the Cyanobacterium Microcystis aeruginosa. MICROBIAL ECOLOGY 2017; 74:22-32. [PMID: 28064361 DOI: 10.1007/s00248-016-0927-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Accepted: 12/28/2016] [Indexed: 06/06/2023]
Abstract
Massive growth of single species of cyanobacteria is a common phenomenon in many eutrophicated waters worldwide. Allelopathic growth control of phytoplankton species is one suggested mechanism, but still controversially discussed. The fact that the synthesis of biological active compounds requires high energy costs and carbon investment for a single cell in contrast to high dilution rates in natural systems questions the universal validity of allelopathic mechanisms, even more as high concentrations of allelopathic substances are often needed in several experiments to cause biological effects. In this study, it was tested, if growth inhibition is induced by chemical signaling alone or via direct cell-cell interaction. As a test system, we used a co-culture of the green algae Oocystis marsonii (Trebouxiophyceae) with the cyanobacterium Microcystis aeruginosa which is known to strongly reduce the growth of the green algal competitor. In this study, direct co-culturing as well as membrane-separated growth chambers were used to test for chemical and contact-mediated interactions. In the membrane-separated chambers, both species can be co-cultivated and a membrane allows the exchange of metabolites. Growth of O. marsonii was only affected in the direct co-cultivation situation, where direct cell-to-cell contact was possible. During direct co-cultivation, deviating cellular traits, namely cell cycle pattern and large cell-aggregate formation of both species, could be detected. These data strongly support the hypothesis of a direct cell-cell-contact necessary for allelopathic growth control in this model system. Such direct contact would allow targeting allelopathic metabolites directly towards the competitor and thereby minimizing dilution effects.
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Affiliation(s)
- Susanne Dunker
- Centre for Environmental Research - UFZ, Permoserstraße 15, 04318, Leipzig, Germany.
- German Centre for Integrative Biodiversity Research - iDiv, Deutscher Platz 5a, 04103, Leipzig, Germany.
| | - Julia Althammer
- Institute of Inorganic and Analytical Chemistry/Bioorganic Analytics, Friedrich Schiller University Jena, 07743, Jena, Germany
| | - Georg Pohnert
- German Centre for Integrative Biodiversity Research - iDiv, Deutscher Platz 5a, 04103, Leipzig, Germany
- Institute of Inorganic and Analytical Chemistry/Bioorganic Analytics, Friedrich Schiller University Jena, 07743, Jena, Germany
| | - Christian Wilhelm
- German Centre for Integrative Biodiversity Research - iDiv, Deutscher Platz 5a, 04103, Leipzig, Germany
- Department of Plant Physiology, University of Leipzig, Johannisallee 23, 04103, Leipzig, Germany
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20
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McGregor GB, Sendall BC. Iningainema pulvinus gen nov., sp nov. (Cyanobacteria, Scytonemataceae) a new nodularin producer from Edgbaston Reserve, north-eastern Australia. HARMFUL ALGAE 2017; 62:10-19. [PMID: 28118884 DOI: 10.1016/j.hal.2016.11.021] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Revised: 11/26/2016] [Accepted: 11/30/2016] [Indexed: 05/12/2023]
Abstract
A new nodularin producing benthic cyanobacterium Iningainema pulvinus gen nov., sp nov. was isolated from a freshwater ambient spring wetland in tropical, north-eastern Australia and characterised using combined morphological and phylogenetic attributes. It formed conspicuous irregularly spherical to discoid, blue-green to olive-green cyanobacterial colonies across the substratum of shallow pools. Morphologically Iningainema is most similar to Scytonematopsis Kiseleva and Scytonema Agardh ex Bornet & Flahault. All three genera have isopolar filaments enveloped by a firm, often layered and coloured sheath; false branching is typically geminate, less commonly singly. Phylogenetic analyses using partial 16S rRNA sequences of three clones of Iningainema pulvinus strain ES0614 showed that it formed a well-supported monophyletic clade. All three clones were 99.7-99.9% similar, however they shared less than 93.9% nucleotide similarity with other cyanobacterial sequences including putatively related taxa within the Scytonemataceae. Amplification of a fragment of the ndaF gene involved in nodularin biosynthesis from Iningainema pulvinus confirmed that it has this genetic determinant. Consistent with these results, analysis of two extracts from strain ES0614 by HPLC-MS/MS confirmed the presence of nodularin at concentrations of 796 and 1096μgg-1 dry weight. This is the third genus of cyanobacteria shown to produce the cyanotoxin nodularin and the first report of nodularin synthesis from the cyanobacterial family Scytonemataceae. These new findings may have implications for the aquatic biota at Edgbaston Reserve, a spring complex which has been identified as a priority conservation area in the central Australian arid and semiarid zones, based on patterns of endemicity.
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Affiliation(s)
- Glenn B McGregor
- Queensland Department of Science, Information Technology and Innovation, GPO Box 5078 Brisbane 4001, Australia.
| | - Barbara C Sendall
- Queensland Department of Health, Forensic and Scientific Services, 39 Kessels Road, Coopers Plains, Qld 4108, Australia
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21
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Visser PM, Verspagen JMH, Sandrini G, Stal LJ, Matthijs HCP, Davis TW, Paerl HW, Huisman J. How rising CO 2 and global warming may stimulate harmful cyanobacterial blooms. HARMFUL ALGAE 2016; 54:145-159. [PMID: 28073473 DOI: 10.1016/j.hal.2015.12.006] [Citation(s) in RCA: 249] [Impact Index Per Article: 31.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Accepted: 12/16/2015] [Indexed: 05/21/2023]
Abstract
Climate change is likely to stimulate the development of harmful cyanobacterial blooms in eutrophic waters, with negative consequences for water quality of many lakes, reservoirs and brackish ecosystems across the globe. In addition to effects of temperature and eutrophication, recent research has shed new light on the possible implications of rising atmospheric CO2 concentrations. Depletion of dissolved CO2 by dense cyanobacterial blooms creates a concentration gradient across the air-water interface. A steeper gradient at elevated atmospheric CO2 concentrations will lead to a greater influx of CO2, which can be intercepted by surface-dwelling blooms, thus intensifying cyanobacterial blooms in eutrophic waters. Bloom-forming cyanobacteria display an unexpected diversity in CO2 responses, because different strains combine their uptake systems for CO2 and bicarbonate in different ways. The genetic composition of cyanobacterial blooms may therefore shift. In particular, strains with high-flux carbon uptake systems may benefit from the anticipated rise in inorganic carbon availability. Increasing temperatures also stimulate cyanobacterial growth. Many bloom-forming cyanobacteria and also green algae have temperature optima above 25°C, often exceeding the temperature optima of diatoms and dinoflagellates. Analysis of published data suggests that the temperature dependence of the growth rate of cyanobacteria exceeds that of green algae. Indirect effects of elevated temperature, like an earlier onset and longer duration of thermal stratification, may also shift the competitive balance in favor of buoyant cyanobacteria while eukaryotic algae are impaired by higher sedimentation losses. Furthermore, cyanobacteria differ from eukaryotic algae in that they can fix dinitrogen, and new insights show that the nitrogen-fixation activity of heterocystous cyanobacteria can be strongly stimulated at elevated temperatures. Models and lake studies indicate that the response of cyanobacterial growth to rising CO2 concentrations and elevated temperatures can be suppressed by nutrient limitation. The greatest response of cyanobacterial blooms to climate change is therefore expected to occur in eutrophic and hypertrophic lakes.
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Affiliation(s)
- Petra M Visser
- Department of Aquatic Microbiology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, P.O. Box 94248, 1090 GE Amsterdam, The Netherlands.
| | - Jolanda M H Verspagen
- Department of Aquatic Microbiology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, P.O. Box 94248, 1090 GE Amsterdam, The Netherlands
| | - Giovanni Sandrini
- Department of Aquatic Microbiology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, P.O. Box 94248, 1090 GE Amsterdam, The Netherlands
| | - Lucas J Stal
- Department of Aquatic Microbiology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, P.O. Box 94248, 1090 GE Amsterdam, The Netherlands; Department of Marine Microbiology, Royal Netherlands Institute for Sea Research (NIOZ), P.O. Box 140, 4400 AC Yerseke, The Netherlands
| | - Hans C P Matthijs
- Department of Aquatic Microbiology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, P.O. Box 94248, 1090 GE Amsterdam, The Netherlands
| | - Timothy W Davis
- NOAA Great Lakes Environmental Research Laboratory, Ann Arbor, MI 48108, USA
| | - Hans W Paerl
- Institute of Marine Sciences, University of North Carolina at Chapel Hill, 3431 Arendell Street, Morehead City, NC 28557, USA
| | - Jef Huisman
- Department of Aquatic Microbiology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, P.O. Box 94248, 1090 GE Amsterdam, The Netherlands
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22
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Gandola E, Antonioli M, Traficante A, Franceschini S, Scardi M, Congestri R. ACQUA: Automated Cyanobacterial Quantification Algorithm for toxic filamentous genera using spline curves, pattern recognition and machine learning. J Microbiol Methods 2016; 124:48-56. [PMID: 27012737 DOI: 10.1016/j.mimet.2016.03.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Revised: 03/10/2016] [Accepted: 03/16/2016] [Indexed: 11/26/2022]
Abstract
Toxigenic cyanobacteria are one of the main health risks associated with water resources worldwide, as their toxins can affect humans and fauna exposed via drinking water, aquaculture and recreation. Microscopy monitoring of cyanobacteria in water bodies and massive growth systems is a routine operation for cell abundance and growth estimation. Here we present ACQUA (Automated Cyanobacterial Quantification Algorithm), a new fully automated image analysis method designed for filamentous genera in Bright field microscopy. A pre-processing algorithm has been developed to highlight filaments of interest from background signals due to other phytoplankton and dust. A spline-fitting algorithm has been designed to recombine interrupted and crossing filaments in order to perform accurate morphometric analysis and to extract the surface pattern information of highlighted objects. In addition, 17 specific pattern indicators have been developed and used as input data for a machine-learning algorithm dedicated to the recognition between five widespread toxic or potentially toxic filamentous genera in freshwater: Aphanizomenon, Cylindrospermopsis, Dolichospermum, Limnothrix and Planktothrix. The method was validated using freshwater samples from three Italian volcanic lakes comparing automated vs. manual results. ACQUA proved to be a fast and accurate tool to rapidly assess freshwater quality and to characterize cyanobacterial assemblages in aquatic environments.
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Affiliation(s)
- Emanuele Gandola
- University of Rome Tor Vergata, Department of Biology, via della Ricerca Scientifica 1, 00133 Rome, Italy; Department of Mathematics, University of Rome Tor Vergata, via della Ricerca Scientifica 1, 00133 Rome, Italy.
| | - Manuela Antonioli
- University of Rome Tor Vergata, Department of Biology, via della Ricerca Scientifica 1, 00133 Rome, Italy; National Institute for Infectious Diseases 'L. Spallanzani' IRCCS, Via Portuense, 292 00149 Rome, Italy; Freiburg Institute for Advanced Studies (FRIAS), University of Freiburg, Freiburg 79104, Germany
| | - Alessio Traficante
- The University of Manchester, Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, Manchester M13 9PL, UK
| | - Simone Franceschini
- University of Rome Tor Vergata, Department of Biology, via della Ricerca Scientifica 1, 00133 Rome, Italy
| | - Michele Scardi
- University of Rome Tor Vergata, Department of Biology, via della Ricerca Scientifica 1, 00133 Rome, Italy
| | - Roberta Congestri
- University of Rome Tor Vergata, Department of Biology, via della Ricerca Scientifica 1, 00133 Rome, Italy; AlgaRes, Spin off of University of Rome Tor Vergata, via della Ricerca Scientifica 1, 00133 Rome, Italy
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Cyanobacterial Metabolite Calothrixins: Recent Advances in Synthesis and Biological Evaluation. Mar Drugs 2016; 14:17. [PMID: 26771620 PMCID: PMC4728514 DOI: 10.3390/md14010017] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Revised: 12/22/2015] [Accepted: 01/04/2016] [Indexed: 12/30/2022] Open
Abstract
The marine environment is host to unparalleled biological and chemical diversity, making it an attractive resource for the discovery of new therapeutics for a plethora of diseases. Compounds that are extracted from cyanobacteria are of special interest due to their unique structural scaffolds and capacity to produce potent pharmaceutical and biotechnological traits. Calothrixins A and B are two cyanobacterial metabolites with a structural assembly of quinoline, quinone, and indole pharmacophores. This review surveys recent advances in the synthesis and evaluation of the biological activities of calothrixins. Due to the low isolation yields from the marine source and the promise this scaffold holds for anticancer and antimicrobial drugs, organic and medicinal chemists around the world have embarked on developing efficient synthetic routes to produce calothrixins. Since the first review appeared in 2009, 11 novel syntheses of calothrixins have been published in the efforts to develop methods that contain fewer steps and higher-yielding reactions. Calothrixins have shown their potential as topoisomerase I poisons for their cytotoxicity in cancer. They have also been observed to target various aspects of RNA synthesis in bacteria. Further investigation into the exact mechanism for their bioactivity is still required for many of its analogs.
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Rastogi RP, Madamwar D, Incharoensakdi A. Bloom Dynamics of Cyanobacteria and Their Toxins: Environmental Health Impacts and Mitigation Strategies. Front Microbiol 2015; 6:1254. [PMID: 26635737 PMCID: PMC4646972 DOI: 10.3389/fmicb.2015.01254] [Citation(s) in RCA: 116] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Accepted: 10/28/2015] [Indexed: 11/13/2022] Open
Abstract
Cyanobacteria are ecologically one of the most prolific groups of phototrophic prokaryotes in both marine and freshwater habitats. Both the beneficial and detrimental aspects of cyanobacteria are of considerable significance. They are important primary producers as well as an immense source of several secondary products, including an array of toxic compounds known as cyanotoxins. Abundant growth of cyanobacteria in freshwater, estuarine, and coastal ecosystems due to increased anthropogenic eutrophication and global climate change has created serious concern toward harmful bloom formation and surface water contamination all over the world. Cyanobacterial blooms and the accumulation of several cyanotoxins in water bodies pose severe ecological consequences with high risk to aquatic organisms and global public health. The proper management for mitigating the worldwide incidence of toxic cyanobacterial blooms is crucial for maintenance and sustainable development of functional ecosystems. Here, we emphasize the emerging information on the cyanobacterial bloom dynamics, toxicology of major groups of cyanotoxins, as well as a perspective and integrative approach to their management.
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Affiliation(s)
- Rajesh P. Rastogi
- BRD School of Biosciences, Sardar Patel UniversityAnand, India
- Laboratory of Cyanobacterial Biotechnology, Department of Biochemistry, Faculty of Science, Chulalongkorn UniversityBangkok, Thailand
| | - Datta Madamwar
- BRD School of Biosciences, Sardar Patel UniversityAnand, India
| | - Aran Incharoensakdi
- Laboratory of Cyanobacterial Biotechnology, Department of Biochemistry, Faculty of Science, Chulalongkorn UniversityBangkok, Thailand
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Noyma NP, Silva TP, Chiarini-Garcia H, Amado AM, Roland F, Melo RCN. Potential effects of UV radiation on photosynthetic structures of the bloom-forming cyanobacterium Cylindrospermopsis raciborskii CYRF-01. Front Microbiol 2015; 6:1202. [PMID: 26579108 PMCID: PMC4627488 DOI: 10.3389/fmicb.2015.01202] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2015] [Accepted: 10/15/2015] [Indexed: 11/13/2022] Open
Abstract
Cyanobacteria are aquatic photosynthetic microorganisms. While of enormous ecological importance, they have also been linked to human and animal illnesses around the world as a consequence of toxin production by some species. Cylindrospermopsis raciborskii, a filamentous nitrogen-fixing cyanobacterium, has attracted considerable attention due to its potential toxicity and ecophysiological adaptability. We investigated whether C. raciborskii could be affected by ultraviolet (UV) radiation. Non-axenic cultures of C. raciborskii were exposed to three UV treatments (UVA, UVB, or UVA + UVB) over a 6 h period, during which cell concentration, viability and ultrastructure were analyzed. UVA and UVA + UVB treatments showed significant negative effects on cell concentration (decreases of 56.4 and 64.3%, respectively). This decrease was directly associated with cell death as revealed by a cell viability fluorescent probe. Over 90% of UVA + UVB- and UVA-treated cells died. UVB did not alter cell concentration, but reduced cell viability in almost 50% of organisms. Transmission electron microscopy (TEM) revealed a drastic loss of thylakoids, membranes in which cyanobacteria photosystems are localized, after all treatments. Moreover, other photosynthetic- and metabolic-related structures, such as accessory pigments and polyphosphate granules, were damaged. Quantitative TEM analyses revealed a 95.8% reduction in cell area occupied by thylakoids after UVA treatment, and reduction of 77.6 and 81.3% after UVB and UVA + UVB treatments, respectively. Results demonstrated clear alterations in viability and photosynthetic structures of C. raciborskii induced by various UV radiation fractions. This study facilitates our understanding of the subcellular organization of this cyanobacterium species, identifies specific intracellular targets of UVA and UVB radiation and reinforces the importance of UV radiation as an environmental stressor.
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Affiliation(s)
- Natália P Noyma
- Laboratory of Aquatic Ecology, Department of Biology, Federal University of Juiz de Fora Juiz de Fora, Brazil
| | - Thiago P Silva
- Laboratory of Cellular Biology, Department of Biology, Federal University of Juiz de Fora Juiz de Fora, Brazil
| | - Hélio Chiarini-Garcia
- Laboratory of Structural Biology and Reproduction, Department of Morphology, Federal University of Minas Gerais Belo Horizonte, Brazil
| | - André M Amado
- Laboratory of Limnology, Department of Oceanography and Limnology, Federal University of Rio Grande do Norte Natal, Brazil
| | - Fábio Roland
- Laboratory of Aquatic Ecology, Department of Biology, Federal University of Juiz de Fora Juiz de Fora, Brazil
| | - Rossana C N Melo
- Laboratory of Cellular Biology, Department of Biology, Federal University of Juiz de Fora Juiz de Fora, Brazil
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26
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He X, de la Cruz AA, Hiskia A, Kaloudis T, O'Shea K, Dionysiou DD. Destruction of microcystins (cyanotoxins) by UV-254 nm-based direct photolysis and advanced oxidation processes (AOPs): influence of variable amino acids on the degradation kinetics and reaction mechanisms. WATER RESEARCH 2015; 74:227-238. [PMID: 25744186 DOI: 10.1016/j.watres.2015.02.011] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Revised: 02/04/2015] [Accepted: 02/06/2015] [Indexed: 06/04/2023]
Abstract
Hepatotoxic microcystins (MCs) are the most frequently detected group of cyanobacterial toxins. This study investigated the degradation of common MC variants in water, MC-LR, MC-RR, MC-YR and MC-LA, by UV-254 nm-based processes, UV only, UV/H2O2, UV/S2O8(2-) and UV/HSO5(-). Limited direct photolysis of MCs was observed, while the addition of an oxidant significantly improved the degradation efficiency with an order of UV/S2O8(2-) > UV/HSO5(-) > UV/H2O2 at the same initial molar concentration of the oxidant. The removal of MC-LR by UV/H2O2 appeared to be faster than another cyanotoxin, cylindrospermopsin, at either the same initial molar concentration or the same initial organic carbon concentration of the toxin. It suggested a faster reaction of MC-LR with hydroxyl radical, which was further supported by the determined second-order rate constant of MCs with hydroxyl radical. Both isomerization and photohydration byproducts were observed in UV only process for all four MCs; while in UV/H2O2, hydroxylation and diene-Adda double bond cleavage byproducts were detected. The presence of a tyrosine in the structure of MC-YR significantly promoted the formation of monohydroxylation byproduct m/z 1061; while the presence of a second arginine in MC-RR led to the elimination of a guanidine group and the absence of double bond cleavage byproducts. It was therefore demonstrated in this study that the variable amino acids in the structure of MCs influenced not only the degradation kinetics but also the preferable reaction mechanisms.
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Affiliation(s)
- Xuexiang He
- Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, OH 45221-0012, United States; Nireas-International Water Research Centre, University of Cyprus, P.O. Box 20537, 1678 Nicosia, Cyprus
| | - Armah A de la Cruz
- Office of Research and Development, U.S. Environmental Protection Agency, Cincinnati, OH 45268, United States
| | - Anastasia Hiskia
- Institute of Advanced Materials, Physicochemical Processes, Nanotechnology and Microsystems, National Center for Scientific Research "Demokritos", Patriarchou Grigoriou & Neapoleos, 15310 Agia Paraskevi, Athens, Greece
| | - Triantafyllos Kaloudis
- Water Quality Department, Athens Water Supply and Sewerage Company (EYDAP SA), Oropou 156, 11146 Galatsi, Athens, Greece
| | - Kevin O'Shea
- Department of Chemistry and Biochemistry, Florida International University, Miami, FL 33199, United States
| | - Dionysios D Dionysiou
- Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, OH 45221-0012, United States; Nireas-International Water Research Centre, University of Cyprus, P.O. Box 20537, 1678 Nicosia, Cyprus.
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Kopf M, Möke F, Bauwe H, Hess WR, Hagemann M. Expression profiling of the bloom-forming cyanobacterium Nodularia CCY9414 under light and oxidative stress conditions. ISME JOURNAL 2015; 9:2139-52. [PMID: 25689027 DOI: 10.1038/ismej.2015.16] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2014] [Accepted: 01/08/2015] [Indexed: 11/10/2022]
Abstract
Massive blooms of toxic cyanobacteria frequently occur in the central Baltic Sea during the summer. In the surface scum, cyanobacterial cells are exposed to high light (HL) intensity, high oxygen partial pressure and other stresses. To mimic these conditions, cultures of Nodularia spumigena CCY9414, which is a strain isolated from a cyanobacterial summer bloom in the Baltic Sea, were incubated at a HL intensity of 1200 μmol photons m(-2) s(-1) or a combination of HL and increased oxygen partial pressure. Using differential RNA sequencing, we compared the global primary transcriptomes of control and stressed cells. The combination of oxidative and light stresses induced the expression of twofold more genes compared with HL stress alone. In addition to the induction of known stress-responsive genes, such as psbA, ocp and sodB, Nodularia cells activated the expression of genes coding for many previously unknown light- and oxidative stress-related proteins. In addition, the expression of non-protein-coding RNAs was found to be stimulated by these stresses. Among them was an antisense RNA to the phycocyanin-encoding mRNA cpcBAC and the trans-encoded regulator of photosystem I, PsrR1. The large genome capacity allowed Nodularia to harbor more copies of stress-relevant genes such as psbA and small chlorophyll-binding protein genes, combined with the coordinated induction of these and many additional genes for stress acclimation. Our data provide a first insight on how N. spumigena became adapted to conditions relevant for a cyanobacterial bloom in the Baltic Sea.
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Affiliation(s)
- Matthias Kopf
- Albert-Ludwigs-Universität Freiburg, Fakultät für Biologie, Genetik und Experimentelle Bioinformatik, Freiburg, Germany
| | - Fred Möke
- Universität Rostock, Institut für Biowissenschaften, Pflanzenphysiologie, Rostock, Germany
| | - Hermann Bauwe
- Universität Rostock, Institut für Biowissenschaften, Pflanzenphysiologie, Rostock, Germany
| | - Wolfgang R Hess
- Albert-Ludwigs-Universität Freiburg, Fakultät für Biologie, Genetik und Experimentelle Bioinformatik, Freiburg, Germany
| | - Martin Hagemann
- Universität Rostock, Institut für Biowissenschaften, Pflanzenphysiologie, Rostock, Germany
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Boopathi T, Ki JS. Impact of environmental factors on the regulation of cyanotoxin production. Toxins (Basel) 2014; 6:1951-78. [PMID: 24967641 PMCID: PMC4113735 DOI: 10.3390/toxins6071951] [Citation(s) in RCA: 87] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2014] [Revised: 06/06/2014] [Accepted: 06/17/2014] [Indexed: 11/25/2022] Open
Abstract
Cyanobacteria are capable of thriving in almost all environments. Recent changes in climatic conditions due to increased human activities favor the occurrence and severity of harmful cyanobacterial bloom all over the world. Knowledge of the regulation of cyanotoxins by the various environmental factors is essential for effective management of toxic cyanobacterial bloom. In recent years, progress in the field of molecular mechanisms involved in cyanotoxin production has paved the way for assessing the role of various factors on the cyanotoxin production. In this review, we present an overview of the influence of various environmental factors on the production of major group of cyanotoxins, including microcystins, nodularin, cylindrospermopsin, anatoxins and saxitoxins.
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Affiliation(s)
| | - Jang-Seu Ki
- Department of Life Science, Sangmyung University, Seoul 110-743, Korea.
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