1 / 8

Understanding Cyanobacteria: Blue-Green Algae Characteristics and Habitat

Cyanobacteria, commonly called blue-green algae, are autotrophic microorganisms found in various aquatic environments such as oceans, lakes, and moist soil. They contain chlorophyll a, phycocyanin, and phycoerythrin, giving them their characteristic colors. These prokaryotic organisms can exist as single cells, colonies, or filaments, with some forms capable of movement. Their primitive cell structure includes a dual-layered cell wall and a chromoplast containing pigments for photosynthesis. Reproduction occurs exclusively through fission, and they store photosynthetic products as starch.

rirby
Télécharger la présentation

Understanding Cyanobacteria: Blue-Green Algae Characteristics and Habitat

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. II. Cyanobacteria Commonly known as blue-green algae. Autotrophic (Photosynthetic). Contain chlorophyll a, phycocyanin (blue) and phycoerythrin (red). They live in aquatic environments including oceans, ponds, lakes, tidal flats, and moist soil. They exist mostly as colonies and filaments and sometimes as single cells. Some filamentous forms can move. For example, filamentous forms such asOscillatoria sp. rotate in a screw like manner. Produce gelatinous capsules which are often lighter than water and therefore help keep the algae up near the surface of the water . Reproduction in by fission only. Prokaryotic cell. Lack chlorophyllb. The photosynthetic product is stored in their own form of starch, which is similar to animal glycogen.

  2. Forms of Cyanobacteria 1. Unicellular or aggregate e.g. Gloeocapsa sp

  3. Forms of Cyanobacteria 2. Colony e.g. Microcystis sp

  4. Forms of Cyanobacteria 3. Filamentous forms a). Unbranched e.g. Anabaena sp

  5. Forms of Cyanobacteria 3. Filamentous forms b) Branched e.g. Stigonemasp

  6. Cell structure • The cell structure is very primitive. • Each cell is composed of two parts: • cell wall • protoplast. The cell wall is composed of 2 layers the inner of which is thin and firm composed of cellulose. The outer layer of the wall is thicker and gelatinous known as the sheath and mainly constituted of pectic compounds. Cell wall Chromoplast Central body

  7. Cell structure • The protoplast consists of 2 parts: • peripheral pigmented (coloured) region surrounding a colourless central region. It contains the blue pigment phycocyanin together with chlorophyll and known as chromoplasm. • The colourless inner region (central body) contains several chromatin granules (DNA) which represent a primitive type of nucleus that lacks nuclear membrane and nucleoli Cell wall Chromoplast Central body

  8. Cyanobacterial cell

More Related