The fixation of atmospheric N(2) by cyanobacteria is a major source of nitrogen in the biosphere. In Nostocales, such as Anabaena, this process is spatially separated from oxygenic photosynthesis and occurs in heterocysts. Upon nitrogen step-down, these specialized cells differentiate from vegetative cells in a process controlled by two major regulators: NtcA and HetR. However, the regulon cont...

Akinetes are spore-like non-motile cells that differentiate from vegetative cells of filamentous cyanobacteria from the order Nostocales. They play a key role in the survival and distribution of these species and contribute to their perennial blooms. Here, we demonstrate variations in cellular ultrastructure during akinete formation concomitant with accumulation of cyanophycin; a copolymer of a...

Cyanobacteria are distributed worldwide, and many new cyanobacterial species discovered in tropical region. TheNostoc-like genus Amazonocrinis has been separated from the Nostoc based on polyphasic methods. However,species diversity within this remains poorly understood systematically because only one (Amazonocrinisnigriterrae) described. In study, two novel strains (NUACC02 NUACC03) were isola...

Abstract. Mass development of the cyanobacteria Dolichospermum (D. lemmermannii as dominant species) was reported in coastal zone Bol shye Koty Bay (western coast southern basin), towards end July to beginning August 2019. Blooms were observed 1 1.5-m wide bands adjoining shoreline and stretched uninterrupted over 2 km. Abundance blooms varied within 7.2 71.9 thousand cell mL-1, with 0.73 7.20 ...