Cylindrospermopsin induced changes in growth, toxi... - BV FAPESP
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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Cylindrospermopsin induced changes in growth, toxin production and antioxidant response of Acutodesmus acuminatus and Microcystis aeruginosa under differing light and nitrogen conditions

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Author(s):
Chia, Mathias Ahii ; Cordeiro-Araujo, Micheline Kezia ; Lorenzi, Adriana Sturion ; Bittencourt-Oliveira, Maria do Carmo
Total Authors: 4
Document type: Journal article
Source: ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY; v. 142, p. 189-199, AUG 2017.
Web of Science Citations: 5
Abstract

Growing evidence suggests that some bioactive metabolites (e.g. cyanotoxins) produced by cyanobacteria have allelopathic potential, due to their inhibitory or stimulatory effects on competing species. Although a number of studies have shown that the cyanotoxin cylindrospermopsin (CYN) has variable effects on phytoplankton species, the impact of changing physicochemical conditions on its allelopathic potential is yet to be investigated. We investigated the physiological response of Microcystis aeruginosa (Cyanobacteria) and Acutodesmus acuminates (Chlorophyta) to CYN under varying nitrogen and light conditions. At 24 h, higher microcystins content of M. aeruginosa was recorded under limited light in the presence of CYN, while at 120 h the lower levels of the toxins were observed in the presence of CYN under optimum light. Total MCs concentration was significantly (p < 0.05) lowered by CYN after 120 h of exposure under limited and optimum nitrogen conditions. On the other hand, there were no significant (p > 0.05) changes in total MCs concentrations after exposure to CYN under high nitrogen conditions. As expected, limited light and limited nitrogen conditions resulted in lower cell density of both species, while CYN only significantly (p < 0.05) inhibited the growth of M. aeruginosa. Regardless of the light or nitrogen condition, the presence of CYN increased internal H2O2 content of both species, which resulted in significant (p < 0.05) changes in antioxidant enzyme (catalase, peroxidase, superoxide dismutase and glutathione S-transferase) activities. The oxidative stress caused by CYN was higher under limited light and limited nitrogen. These results showed that M. aeruginosa and A. acuminates have variable response to CYN under changing light and nitrogen conditions, and demonstrate that need to consider changes in physicochemical conditions during ecotoxicological and ecophysiological investigations. (AU)

FAPESP's process: 13/11306-3 - The Effects of anatoxin-a and cylindrospermopsin at different nitrogen concentrations and photon irradiances on the physiology of Microcystis aeruginosa (Cyanobacteria) and Scenedesmus acuminatus (Chlolrophyta)
Grantee:Mathias Ahii Chia
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 13/15296-2 - Comparative metagenomics of cyanobacterial blooms in freshwater reservoirs from Pernambuco State
Grantee:Adriana Sturion Lorenzi
Support Opportunities: Research Grants - Young Investigators Grants
FAPESP's process: 15/17397-6 - CIRCADIAN RHYTHM IN THE PRODUCTION AND RELEASE OF MICROCYSTINS, EXPRESSION OF mcyE GENE AND PHYSIOLOGICAL STRESS IN CYANOBACTERIA: IMPLICATIONS OF GLOBAL CLIMATE CHANGES
Grantee:Micheline Kézia Cordeiro de Araújo
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 14/26898-6 - Unravelling some physiological and molecular processes involved in the allelopathic interactions between toxic and non-toxic phytoplankton
Grantee:Mathias Ahii Chia
Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
FAPESP's process: 14/01934-0 - Bioaccumulation and detoxification study of cyanobacteria toxins (microcystins and cilindrospermopsin) in lettuce and arugula
Grantee:Maria Do Carmo Bittencourt de Oliveira
Support Opportunities: Regular Research Grants