What is Nostoc — Definition, Structure, Importance 2. What is Anabaena — Definition, Structure, Importance 3. Nostoc is a genus of cyanobacteria characterized by the formation of cylindrical, spherical or ovoid colonies. The filaments of these colonies are embedded in a gelatinous substance. Further, Nostoc lives in various environments, including the soil, moist rocks, freshwater, and marine habitats. And, it forms symbiotic relationships within plant tissues of hornworts, Gunnera , etc.
Besides, terminally-differentiated heterocysts are the type of cells in Nostoc , involving in the nitrogen-fixation. Also, Nostoc contains photosynthetic pigments in the cytoplasm to undergo photosynthesis. Due to the containment of proteins and vitamin C, Nostoc is consumed as a foodstuff in Asia. Anabaena is a filamentous , nitrogen-fixing cyanobacterium characterized by the formation of intercalary heterocysts and isolated, amorphous filaments. It produces akinetes , which are enveloped, thick-walled, non-motile, dormant cell s.
Also, Anabaena forms symbiotic relationships with several plants, including mosquito fern. Moreover, in these plants, Anabaena produces neurotoxins harmful to local wildlife. MLA 8 Sison, Jade. Very very thanks. Thanks for the good job. Why there is mucilaginous covering over vegetative cells in anabeana … And What directs them not to make colonies?
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Nostoc and Anabaena — The Comparison Characteristics Nostoc Anabena Image Domain Prokarya Prokarya Kingdom Bacteria Bacteria Phylum Cynobacteria Cynobacteria Order Nostocales Nostocales Family Nostocaceae Nostocaceae Genus Nostoc Anabeana Description Forms a gelatinous colony — cells appear cylindrical, spherical or ovoid Filaments trichomes may be coiled or straights, solitary or clustered Habitat Lakes, ponds, sand or usually just where the ripples lap the shore Within certain plants ex: mosquito fern, rice plants, legumes etc.
Reproduction Simple Fission or fragmentation Trichome fragmentation at heterocytes and by akinetes Nostoc These organisms are found in lakes, ponds, sand or usually just where the ripples lap the shore.
Anabaena Anabaenas are known for their intercalary heterocysts and amorphous filaments. Author Recent Posts. Jade Sison. Latest posts by Jade Sison see all.
Help us improve. Anabaena is a cyanobacterium that is composed of beadlike or barrellike cells formed into colonies. It is a filamentous cyanobacterium that normally exists as plankton. It has uniform trichomes. Anabaena cells are not covered with a mucilaginous sheath. The vegetative cells or trichomes of Anabaena are arranged in chains, and they are not branched. It is found in symbiotic relationships with certain plants. One common water fern is Azolla.
The association of Anabaena with plants provides plants nitrogen while plants supply carbon for Anabaena. Therefore, most of the rice farmers use Azolla fern which has Anabaena as an organic fertilizer to supply nitrogen into rice plants.
Anabaena possesses the ability to fix atmospheric nitrogen. Nitrogen fixation is carried out by the specialized cells called heterocysts of Anabaena. Heterocysts develop from vegetative cells for the above purpose. Anabaena is a photoautotrophic cyanobacterium.
It performs oxygenic photosynthesis and produces its own foods. During the photosynthesis, it releases oxygen into the atmosphere. Anabaena can be found in fresh water, and it is considered as a contaminant of drinking water since it gives fishy odour and taste. Anabaena is popular as a producer of neurotoxins, which is a harmful product for wildlife. Similar to Nostoc, Anabaena is also reproduce by fragmentation. And also it possesses akinetes to withstand harsh environmental conditions.
Anabaena and Nostoc are two cyanobacteria that can photosynthesize and fix nitrogen. Both are able to make symbiotic relationships with certain plants. Both possess heterocysts and akinetes.
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