Comparison between Heterocyst and Hormogonia

By: Prof. Dr. Fazal Rehman | Last updated: February 3, 2024

Let me share with you a comparison between Heterocyst and Hormogonia.

Aspect Heterocyst Hormogonia
Function Heterocysts are specialized cells that fix atmospheric nitrogen into a form usable by the cyanobacterium and neighboring cells. Hormogonia are specialized filaments that function in the dispersal and colonization of new environments.
Structure Larger in size as compared to vegetative cells. Short, specialized filaments.
Cell Wall Thicker cell wall to protect against oxygen. Similar to the cell wall of vegetative cells.
Role in nitrogen fixation Specialized for nitrogen fixation. No role
Formation Regulation Induced under nitrogen-limiting conditions. Formed in response to environmental cues or stress conditions
Location Distributed among vegetative cells in the filament. Often found at the ends of filaments.
Role in filaments Integral part of the filament structure. May break away from the main filament to form new colonies or to colonize new areas.
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