Allelopathic effects of cyanotoxins on the physiological responses of Chlorella vulgaris

Contributing to the assessment of potential physiological changes in microalgae subjected to different concentrations and types of cyanotoxins, this study investigated the inhibitory effects of cyanotoxins on the growth, density, biomass, and ecotoxicity of Chlorella vulgaris. Chlorella vulgaris was...

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Veröffentlicht in:Toxicon (Oxford) 2024-09, Vol.248, p.107847, Article 107847
Hauptverfasser: Albuquerque, Maria Virgínia da Conceição, Ramos, Railson de Oliveira, de Paula e Silva, Maria Célia Cavalcante, Rodrigues, Roberta Milena Moura, Leite, Valderi Duarte, Lopes, Wilton Silva
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creator Albuquerque, Maria Virgínia da Conceição
Ramos, Railson de Oliveira
de Paula e Silva, Maria Célia Cavalcante
Rodrigues, Roberta Milena Moura
Leite, Valderi Duarte
Lopes, Wilton Silva
description Contributing to the assessment of potential physiological changes in microalgae subjected to different concentrations and types of cyanotoxins, this study investigated the inhibitory effects of cyanotoxins on the growth, density, biomass, and ecotoxicity of Chlorella vulgaris. Chlorella vulgaris was exposed to crude extracts of cyanobacteria producing microcystin-LR (MC-LR), saxitoxin (SXT), anatoxin-a (ATX-A), and cylindrospermopsin (CYN) with initial concentrations of 5.0, 2.05, 0.61, and 1.42 μg.L−1, respectively. The experiments were conducted under controlled conditions, and monitoring of growth and cell inhibition occurred at 24h, 48h, 72h, and 96h. Chlorophyll-a content and ecotoxicity assessment were conducted with samples collected after 96h of exposure to cyanotoxins. The growth assays of Chlorella vulgaris, with results expressed in terms of average growth rates (doublings/day), indicated the following order for cyanotoxins: SXT (2.03) > CYN (1.66) > MC-LR (1.56) > ATX-A (0.18). This assay revealed the prominent inhibitory potential of ATX-A on Chlorella vulgaris growth compared to the other toxins evaluated. Regarding the inhibition of the photosynthetic process, expressed in terms of the percentage inhibition of Chlorophyll-a, the following order for cyanotoxins was obtained: ATX-A (82%) > MC-LR (76%) > STX (46%) > CYN (16%). These results also indicated that among the cyanotoxins, ATX-A was the most detrimental to the photosynthetic process. However, contrary to the observations in the growth study, SXT proved to be more harmful than CYN in terms of Chlorophyll-a inhibition. Finally, the results of the toxicity assay revealed that only ATX-A and MC-LR exerted a chronic influence on Chlorella vulgaris under the investigated conditions. [Display omitted] •Phytotoxicity of cyanotoxins induces different physiological responses to Chlorella vulgaris.•MC-LR and ATX-A promote greater inhibitory effects on the growth, density, biomass and ecotoxicity of Chlorella vulgaris.•The lowest inhibitions of algal growth among the cyanotoxins were for SXT and CYN.•The percentage inhibition of Chlorophyll –a was: ATX-A (82%) > MC-LR (76%) > SAX (46%) > CYN (16%).
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Regarding the inhibition of the photosynthetic process, expressed in terms of the percentage inhibition of Chlorophyll-a, the following order for cyanotoxins was obtained: ATX-A (82%) &gt; MC-LR (76%) &gt; STX (46%) &gt; CYN (16%). These results also indicated that among the cyanotoxins, ATX-A was the most detrimental to the photosynthetic process. However, contrary to the observations in the growth study, SXT proved to be more harmful than CYN in terms of Chlorophyll-a inhibition. Finally, the results of the toxicity assay revealed that only ATX-A and MC-LR exerted a chronic influence on Chlorella vulgaris under the investigated conditions. 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Chlorella vulgaris was exposed to crude extracts of cyanobacteria producing microcystin-LR (MC-LR), saxitoxin (SXT), anatoxin-a (ATX-A), and cylindrospermopsin (CYN) with initial concentrations of 5.0, 2.05, 0.61, and 1.42 μg.L−1, respectively. The experiments were conducted under controlled conditions, and monitoring of growth and cell inhibition occurred at 24h, 48h, 72h, and 96h. Chlorophyll-a content and ecotoxicity assessment were conducted with samples collected after 96h of exposure to cyanotoxins. The growth assays of Chlorella vulgaris, with results expressed in terms of average growth rates (doublings/day), indicated the following order for cyanotoxins: SXT (2.03) &gt; CYN (1.66) &gt; MC-LR (1.56) &gt; ATX-A (0.18). This assay revealed the prominent inhibitory potential of ATX-A on Chlorella vulgaris growth compared to the other toxins evaluated. Regarding the inhibition of the photosynthetic process, expressed in terms of the percentage inhibition of Chlorophyll-a, the following order for cyanotoxins was obtained: ATX-A (82%) &gt; MC-LR (76%) &gt; STX (46%) &gt; CYN (16%). These results also indicated that among the cyanotoxins, ATX-A was the most detrimental to the photosynthetic process. However, contrary to the observations in the growth study, SXT proved to be more harmful than CYN in terms of Chlorophyll-a inhibition. Finally, the results of the toxicity assay revealed that only ATX-A and MC-LR exerted a chronic influence on Chlorella vulgaris under the investigated conditions. [Display omitted] •Phytotoxicity of cyanotoxins induces different physiological responses to Chlorella vulgaris.•MC-LR and ATX-A promote greater inhibitory effects on the growth, density, biomass and ecotoxicity of Chlorella vulgaris.•The lowest inhibitions of algal growth among the cyanotoxins were for SXT and CYN.•The percentage inhibition of Chlorophyll –a was: ATX-A (82%) &gt; MC-LR (76%) &gt; SAX (46%) &gt; CYN (16%).</description><subject>Allelopathy</subject><subject>biomass</subject><subject>Chlorella vulgaris</subject><subject>chlorophyll</subject><subject>Cyanobacteria</subject><subject>cylindrospermopsin</subject><subject>Ecotoxicity</subject><subject>ecotoxicology</subject><subject>Microalgae</subject><subject>microcystin-LR</subject><subject>photosynthesis</subject><subject>saxitoxins</subject><subject>toxicity</subject><issn>0041-0101</issn><issn>1879-3150</issn><issn>1879-3150</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2024</creationdate><recordtype>article</recordtype><recordid>eNqFkMtO6zAURS10EZTHJ4AyvJOU40fiZIRQxUtCYgISM8t1jqkrN861U0T_Hpf2MmV05KO1ve1FyAWFKQVaXy2nY_h0JvRTBkzknWyEPCAT2si25LSCP2QCIGgJGT8mJyktAYA3bX1EjnkLrBKinZC3G-_Rh0GPC2cKtBbNmIpgC7PRfdhW9PnYF-MCi2GxSS748O6M9kXENIQ-4Tc9W_gQ0XtdfKz9u44unZFDq33C8_08Ja93ty-zh_Lp-f5xdvNUGibrsbQcDZ0LYEyySnfSctYZQKhbNELouTUC85fqtqsqKyugGrgGpLxDyYEiPyV_d_cOMfxbYxrVyiWzfUqPYZ1UVsHrhtac_o5Cw2omW9FktNqhJoaUIlo1RLfScaMoqK1_tVR7_2rrX-3859zlvmI9X2H3k_ovPAPXOwCzkw-HUSXjsDfYuZjVqy64Xyq-AIY6mkM</recordid><startdate>20240901</startdate><enddate>20240901</enddate><creator>Albuquerque, Maria Virgínia da Conceição</creator><creator>Ramos, Railson de Oliveira</creator><creator>de Paula e Silva, Maria Célia Cavalcante</creator><creator>Rodrigues, Roberta Milena Moura</creator><creator>Leite, Valderi Duarte</creator><creator>Lopes, Wilton Silva</creator><general>Elsevier Ltd</general><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope><scope>7S9</scope><scope>L.6</scope><orcidid>https://orcid.org/0000-0001-5060-584X</orcidid><orcidid>https://orcid.org/0000-0002-0151-7664</orcidid><orcidid>https://orcid.org/0000-0001-5861-7407</orcidid></search><sort><creationdate>20240901</creationdate><title>Allelopathic effects of cyanotoxins on the physiological responses of Chlorella vulgaris</title><author>Albuquerque, Maria Virgínia da Conceição ; Ramos, Railson de Oliveira ; de Paula e Silva, Maria Célia Cavalcante ; Rodrigues, Roberta Milena Moura ; Leite, Valderi Duarte ; Lopes, Wilton Silva</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c276t-f3ec1b4022725ad7f32dc0e069ec44abfc4e18769d55f7501a03a0e13de7301e3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2024</creationdate><topic>Allelopathy</topic><topic>biomass</topic><topic>Chlorella vulgaris</topic><topic>chlorophyll</topic><topic>Cyanobacteria</topic><topic>cylindrospermopsin</topic><topic>Ecotoxicity</topic><topic>ecotoxicology</topic><topic>Microalgae</topic><topic>microcystin-LR</topic><topic>photosynthesis</topic><topic>saxitoxins</topic><topic>toxicity</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Albuquerque, Maria Virgínia da Conceição</creatorcontrib><creatorcontrib>Ramos, Railson de Oliveira</creatorcontrib><creatorcontrib>de Paula e Silva, Maria Célia Cavalcante</creatorcontrib><creatorcontrib>Rodrigues, Roberta Milena Moura</creatorcontrib><creatorcontrib>Leite, Valderi Duarte</creatorcontrib><creatorcontrib>Lopes, Wilton Silva</creatorcontrib><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><collection>AGRICOLA</collection><collection>AGRICOLA - Academic</collection><jtitle>Toxicon (Oxford)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Albuquerque, Maria Virgínia da Conceição</au><au>Ramos, Railson de Oliveira</au><au>de Paula e Silva, Maria Célia Cavalcante</au><au>Rodrigues, Roberta Milena Moura</au><au>Leite, Valderi Duarte</au><au>Lopes, Wilton Silva</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Allelopathic effects of cyanotoxins on the physiological responses of Chlorella vulgaris</atitle><jtitle>Toxicon (Oxford)</jtitle><addtitle>Toxicon</addtitle><date>2024-09-01</date><risdate>2024</risdate><volume>248</volume><spage>107847</spage><pages>107847-</pages><artnum>107847</artnum><issn>0041-0101</issn><issn>1879-3150</issn><eissn>1879-3150</eissn><abstract>Contributing to the assessment of potential physiological changes in microalgae subjected to different concentrations and types of cyanotoxins, this study investigated the inhibitory effects of cyanotoxins on the growth, density, biomass, and ecotoxicity of Chlorella vulgaris. Chlorella vulgaris was exposed to crude extracts of cyanobacteria producing microcystin-LR (MC-LR), saxitoxin (SXT), anatoxin-a (ATX-A), and cylindrospermopsin (CYN) with initial concentrations of 5.0, 2.05, 0.61, and 1.42 μg.L−1, respectively. The experiments were conducted under controlled conditions, and monitoring of growth and cell inhibition occurred at 24h, 48h, 72h, and 96h. Chlorophyll-a content and ecotoxicity assessment were conducted with samples collected after 96h of exposure to cyanotoxins. The growth assays of Chlorella vulgaris, with results expressed in terms of average growth rates (doublings/day), indicated the following order for cyanotoxins: SXT (2.03) &gt; CYN (1.66) &gt; MC-LR (1.56) &gt; ATX-A (0.18). This assay revealed the prominent inhibitory potential of ATX-A on Chlorella vulgaris growth compared to the other toxins evaluated. Regarding the inhibition of the photosynthetic process, expressed in terms of the percentage inhibition of Chlorophyll-a, the following order for cyanotoxins was obtained: ATX-A (82%) &gt; MC-LR (76%) &gt; STX (46%) &gt; CYN (16%). These results also indicated that among the cyanotoxins, ATX-A was the most detrimental to the photosynthetic process. However, contrary to the observations in the growth study, SXT proved to be more harmful than CYN in terms of Chlorophyll-a inhibition. Finally, the results of the toxicity assay revealed that only ATX-A and MC-LR exerted a chronic influence on Chlorella vulgaris under the investigated conditions. [Display omitted] •Phytotoxicity of cyanotoxins induces different physiological responses to Chlorella vulgaris.•MC-LR and ATX-A promote greater inhibitory effects on the growth, density, biomass and ecotoxicity of Chlorella vulgaris.•The lowest inhibitions of algal growth among the cyanotoxins were for SXT and CYN.•The percentage inhibition of Chlorophyll –a was: ATX-A (82%) &gt; MC-LR (76%) &gt; SAX (46%) &gt; CYN (16%).</abstract><cop>England</cop><pub>Elsevier Ltd</pub><pmid>39025449</pmid><doi>10.1016/j.toxicon.2024.107847</doi><orcidid>https://orcid.org/0000-0001-5060-584X</orcidid><orcidid>https://orcid.org/0000-0002-0151-7664</orcidid><orcidid>https://orcid.org/0000-0001-5861-7407</orcidid></addata></record>
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subjects Allelopathy
biomass
Chlorella vulgaris
chlorophyll
Cyanobacteria
cylindrospermopsin
Ecotoxicity
ecotoxicology
Microalgae
microcystin-LR
photosynthesis
saxitoxins
toxicity
title Allelopathic effects of cyanotoxins on the physiological responses of Chlorella vulgaris
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