Anabaena

Kingdom: Bacteria

Division: Cyanophyta

Class: Cyanophyceae

Order: Nostocales

Family: Nostocaceae

Genus: Anabaena

Anabaena is the filamentous form found occurring either in the single filament or as free-floating colonies or in a delicate means the stratum in permanent or semi- permanent form. Some spices of anabaena are endophytic and have within roots of circus and aquatic pteriodophyte azolla. The Trico are the same thickness through out, sometimes slightly alternated at the typical ends. They are straight cercinated or irregularly contorted concurringly with a hyaline watery sheet.

The cells are usually spherical or barrel shaped .they are typically cyanophyceae with a cell wall made up of peptidoglycogen enclosing the protoplasm. The protoplasm differentiated in outer and central colorless

The centroplasm has an incipient nuclei and the chromoplasm has phycocyrin , phcoerithrin, along with the chlorophyll on photosynthetic lamellae . The protoplasm of vegetative cells are usually filled with numerous psedovacuoles. The heterocyst’s in the filament are inter-colonial and are in a same shape as vegetative cells.

Thick walled resting cells called akinetes are found adjacent to the heterocysts.

Reproduction takes place by means of homogonium and akinetes.

Posted in: Microbiology