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Nostocaceae : ウィキペディア英語版
Nostocaceae

The Nostocaceae is a family of cyanobacteria that forms filament-shaped colonies enclosed in mucus or a gelatinous sheath. Some genera in this family are found primarily in fresh water (such as ''Nostoc''), while others are found primarily in salt water (such as ''Nodularia''). Other genera (e.g. ''Anabaena'') may be found in both fresh and salt water.
Like other cyanobacteria, these bacteria sometimes contain photosynthetic pigments in their cytoplasm to perform photosynthesis. The particular pigments they contain gives the cells a bluish-green color.
Species of the Nostocaceae are particularly known for their nitrogen fixing abilities, and they form symbiotic relationships with certain plants, such as the mosquito fern, cycads, and hornworts. The cyanobacteria provides nitrogen to its host. Certain species of ''Anabaena'' have been used on rice paddy fields. Mosquito ferns carrying the cyanobacteria grow on the water in the fields during the growing season. They and the nitrogen they contain are then plowed into the soil following the harvest, which has proved to be an effective natural fertilizer.
The family Nostocaceae belongs to the order Nostocales. Members of the family can be distinguished from those in other families by their (1) unbranched filaments of cells arranged end-to-end, and (2) development of heterocysts among the cells of the filaments.
== References ==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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