Now we will study the Cyanobacteria.... CYANOBACTERIA These are blue-green bacterias photosynthetic , mostly photolysis mediated oxygen evolveing prokaryotes Come among the oldest organisms Thallus ranges from unicellular , colonial to filamentous, multiseriate branched filamentous condition Their distinguishing characters are- Grow on diverse habitats for they have dual-capacity of oxygenic as well as facultatively anoxygenic photosynthesis. possess various morphologically distinctive structures like akinetes and heterocyst. cell wall is made up of peptidoglycan cyanobacterial cytoplasm is covered extensively by flattened vesicular structures called thylakoids or lamellae which are the photosynthetic sites Pigments present are-Chlorophyll-a , Beta-carotene , phycobiliproteins (which include phycocyanin , allophycocyanin , phycoerythrin and allophycocyanin B) . Some are motile and some show gliding movement when not having flagella. Ultrastructure of cyanob...
Comments
Post a Comment