Journal
EUROPEAN JOURNAL OF PHYCOLOGY
Volume 55, Issue 3, Pages 327-338Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09670262.2020.1734667
Keywords
Aphanizomenon gracile; cyanobacteria; neurotoxins; PC-IGS; sxtA gene
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Funding
- European Cooperation in Science and Technology [ES 1105]
- Education Exchanges Support Foundation (Lithuania) [AM-PL-2016-LT-20]
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This study describes the first report on saxitoxins (STXs) and anatoxin-a (ANTX-a) production by cyanobacteria in Lithuanian lakes. Seasonal fluctuation patterns for neurotoxins were determined in samples collected from eutrophic lakes during July-September. Strains of Aphanizomenon gracile, A. flos-aquae, Cuspidothrix issatschenkoi, Sphaerospermopsis aphanizomenoides and Anabaenopsis cf. elenkinii were also isolated from the lakes and screened for the occurrence of neurotoxic STXs, ANTX-a and for the cytotoxin cylindrospermopsin (CYN). The highest concentration of STX (up to 1.06 mu g l(-1) in Lake Jieznas) was detected during July-August and coincided with a predominance of A. gracile in the phytoplankton. Of the isolated strains, only A. gracile was confirmed to be a producer of STXs by chemical (LC-MS/MS) and genetic (sxtA) methods. Sequencing of the phycocyanin intergenic spacer and flanking regions (cpcBA) revealed that A. gracile formed a genetically homogenous group. Only trace amounts of ANTX-a were detected in field samples (up to 0.31 mu g l(-1) in Lake Sirvys). CYN was detected in neither the bloom samples nor in the isolated strains.
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