1 / 14

Cyanobacteria

Cyanobacteria. Matt, Alex, Megan. Characteristics. Photosynthetic autotrophs Get their name from the blue pigment phycocyanin which they use to capture light for photosynthesis. Use the Calvin Cycle as a photosynthetic pathway, just as eukaryotic, higher plants.

rich
Download Presentation

Cyanobacteria

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. Cyanobacteria Matt, Alex, Megan

  2. Characteristics • Photosynthetic autotrophs • Get their name from the blue pigment phycocyanin which they use to capture light for photosynthesis. • Use the Calvin Cycle as a photosynthetic pathway, just as eukaryotic, higher plants. • Previously referred to as “blue green algae, but are not eukaryotic algae.

  3. Characteristics Continued • Can fix and convert inert nitrogento organic forms in heterocysts.

  4. Characteristics Continued • Cell walls containing peptidoglycan add strength and counteract osmotic pressure from cytoplasm. • Depending on the environment, cyanobacteria colonies form filaments, sheets, or hollow balls. • Prokaryotic with an elaborate system of internal membranes useful in photosynthesis—Chlorophyll A and phycobilins (accessory pigments) are embedded in these membranes. • Larger than most other bacteria and have remained morphologically similar for billions of years.

  5. History • 1st oxygenic phototrophs on earth • Stromatolites: 3.5 billion years • Endosymbiotic Theory

  6. Classification • Phylogeny poorly understood • 35-71% GC; 38-46% in heterocyst formers • Define by: colony morphology, reproduction, cell morphology, genetics, habitat, ecology • Bergey’s 2nd edition gave: • 57 genera within 5 subgroups

  7. Classification Continued

  8. Examples • Oscillatoria: causes Red Sea color • Spirulina: food source high in protein • Anabaena: symbiosis with Azolla fern • Lyngbya: “swimmers itch”

  9. Metabolism • Autotrophic so they produce their own food from simple raw materials. • Heterocysts allow atmospheric nitrogen to be convert in the anaerobic environment • Photosynthesis plays vast role in reproduction and growth. -The wavelength of light absorbed determines what form will grow along with phosphate and iron consumption.

  10. Reproduction • Can reproduce many ways: -Binary fission-DNA is duplicated and divided in half. -Budding-Smaller cells form from larger ones. -Fragmentation-Fragments regenerate into complete organism • Many ways of reproduction explains the various appearances Cyanobacteria can have. Ie.) slimy masses, strings, filaments, branched filaments…

  11. Habitat • Freshwater • Wastewater • Marine • Terrestrial • Adaptations • Gliding Motility • Gas Vesicles

  12. Hot Springs

  13. Current Research • Wirtz, Nora et al. “Lichen fungi have low cyanobiont selectivity in maritime Antartica.” New Phytologist. 2003. 160: 177-183. • Price, G.D. et al. “Identification of an SulP-type bicarbonate transporter in marine cyanobacteria.” PNAS. 2004. 101(52): 18228-18233

  14. The End Hello My Name Is Jeff

More Related