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Cyanobacteria differentiate into hormogonia when exposed to an environmental stress or when placed in new media. Hormogonium differentiation is crucial for the development of nitrogen-fixing plant cyanobacteria symbioses, in particular that between cyanobacteria of the genus Nostoc and their hosts .
Many cyanobacteria form motile filaments of cells, called hormogonia, that travel away from the main biomass to bud and form new colonies elsewhere. [ 45 ] [ 46 ] The cells in a hormogonium are often thinner than in the vegetative state, and the cells on either end of the motile chain may be tapered.
These fragments are called hormogonia (singular hormogonium) and undergo asexual reproduction. The cyanobacteria that form heterocysts are divided into the orders Nostocales and Stigonematales , which form simple and branching filaments respectively.
Many cyanobacteria form motile filaments of cells, called hormogonia, that travel away from the main biomass to bud and form new colonies elsewhere. [ 52 ] [ 53 ] The cells in a hormogonium are often thinner than in the vegetative state, and the cells on either end of the motile chain may be tapered.
Oscillatoria is a genus of filamentous cyanobacteria. It is often found in freshwater environments. [1] Its name refers to the oscillating motion of its filaments as they slide against each other to position the colony to face a light source. [2] Oscillatoria uses photosynthesis to survive and reproduce.
Members of the cyanobacterial genus Nostoc can become motile through the use of hormogonia, while the host plant excretes chemicals to guide the cyanobacteria via chemotaxis. [33] For instance, liverworts in the genus Blasia can secrete HIF, a strong chemo-attractant for nitrogen-starved and symbiotic cyanobacteria.
Rivularia is a genus of cyanobacteria of the family Rivulariaceae. [1] Description ... The species multiply with the aid of hormogonia and heterocyst. Species
Nostoc punctiforme is a species of filamentous cyanobacterium.Under non-limiting nutritional environmental conditions, its filaments are composed of photosynthetic vegetative cells; upon nutrient limitation, some of these cells undergo differentiation into heterocysts, akinetes or hormogonia.