Abstract
Toxin-producing cyanobacteria are a worldwide threat to both human and animal health. Microcystins (MCs) are the most commonly occurring toxins produced by bloom-forming cyanobacteria, especially Microcystis sp. This study describes the occurrence of bloom-forming toxigenic Microcystis aeruginosa MBDU 626 from Manjalar Dam, Theni District, Tamil Nadu, South India. Two microcystin (MC) variants, MC-LR and [D-Asp3] MC-LR were identified from the isolated strain using high-performance liquid chromatography and gas chromatography coupled mass spectrometry (GC/MS). Four peptides such as aeruginosin, microginin, kasumigamide and anabaenopeptin were also co-produced along with these MC variants. Our results show that the presence of cyanobacterial toxins in essential water resources requires rapid remedial action and needs to develop a national program for regular monitoring of toxigenic blooms in freshwater bodies of South India, in general, Tamil Nadu, in particular.
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