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Hormogonia are motile filaments of cells formed by some cyanobacteria in the family Nostoceae.
Additional recommended knowledge
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. In response to a hormogonium-inducing factor (HIF) secreted by plant hosts, cyanobacterial symbionts differentiate into hormogonia and then dedifferentiate back into vegetative cells after about 96 hours. Hopefully, they have managed to reach the plant host by this time. The bacteria then differentiate specialized nitrogen-fixing cells called heterocysts and enter into a working symbiosis with the plant.
Depending on species, Hormogonia can be many hundreds of micrometers in length and can travel as fast as 11 μm/s. They move via gliding motility, requiring a wet-able surface or a viscous substrate, such as agar for motion.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Hormogonium". A list of authors is available in Wikipedia.|