Abstract
Cylindrospermopsis raciborskii is an invasive freshwater cyanobacteria of tropical origin, also found in temperate regions. Due to its known ability to produce potent toxins, such as cylindrospermopsin and the paralytic shellfish poisoning, this species is of major concern from a water quality perspective. This study presents a genetic characterization of four C. raciborskii strains isolated from the Bir M’cherga Tunisian reservoir. The toxicity assessment was investigated via molecular biology tools, which suggested that all the isolated strains were not producing cylindrospermopsin, saxitoxin, or microcystin. This result was further confirmed by HPLC and MALDI-TOF analyses. However, we report for the first time in C. raciborskii the presence of mcyA and mcyE, two segments of the microcystin synthetase mcy cluster. All the strains were identified taxonomically based on the 16S rRNA sequences, and their phylogenetic relationships were assessed using the rpoC1 region. Tunisian strains formed a distinct clade separated from the other African strains.
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Acknowledgments
This study was supported by U.R Ecosystèmes et Ressources Aquatiques, Institut National Agronomique de Tunisie and L.E.G.E, Centro de Investigação Marinha e Ambiental- CIIMAR/CIMAR, Portugal. A fellowship was also accorded to Afef FATHALLI from the Embassy of Portugal in Tunisia, Service of Co-operation and Cultural Action. This study was partially funded by FCT through projects PTDC/AMB/67075/2006 and PTDC/AAC-AMB/104983/2008.
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Communicated by Erko Stackebrandt.
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Fathalli, A., Jenhani, A.B.R., Moreira, C. et al. Genetic variability of the invasive cyanobacteria Cylindrospermopsis raciborskii from Bir M’cherga reservoir (Tunisia). Arch Microbiol 193, 595–604 (2011). https://doi.org/10.1007/s00203-011-0704-y
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DOI: https://doi.org/10.1007/s00203-011-0704-y