''Synechocystis'' is a genus of
unicellular, freshwater
cyanobacteria
Cyanobacteria ( ) are a group of autotrophic gram-negative bacteria that can obtain biological energy via oxygenic photosynthesis. The name "cyanobacteria" () refers to their bluish green (cyan) color, which forms the basis of cyanobacteri ...
in the family
Merismopediaceae. It includes a strain,
''Synechocystis'' sp. PCC 6803, which is a well studied
model organism
A model organism is a non-human species that is extensively studied to understand particular biological phenomena, with the expectation that discoveries made in the model organism will provide insight into the workings of other organisms. Mo ...
.

Like all cyanobacteria, ''Synechocystis'' branches on the evolutionary tree from its ancestral root, ''
Gloeobacter violaceus''. ''Synechocystis'' is not
diazotrophic, and is closely related to another model organism, ''
Cyanothece'' ATCC 51442. It has been suggested that originally ''Synechocystis'' possessed the ability to fix atmospheric nitrogen, but lost the genes required for the process. ''Synechocystis'' can detect light and move in the direction of light.
See also
*
''Synechocystis'' run-and-tumble
References
{{Taxonbar, from=Q7662346
Cyanobacteria genera
Synechococcales
Bacteria genera