Proteobacteria Nitrogen-Fixing Bacteria

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Presentation transcript:

Proteobacteria Nitrogen-Fixing Bacteria Earth's atmosphere is 80% nitrogen but plants and animals cannot use nitrogen in gaseous state We require nitrogen to make nitrogen-containing compounds like proteins and nucleic acids Rhizobium are essential to the nitrogen cycle Legumes have lots of root nodules, filled with these bacteria

Cyanobacteria Gram-Negative bacteria that perform plant-like photosynthesis & release oxygen as by-product (waste) Once classified as blue-green algae Now considered eubacteria, because they lack a membrane-bound nucleus & chloroplasts

Cyanobacteria “Eutrophication”: Population Bloom of bacteria = sudden increase in # of cyanobacteria due to high availability of nutrients. After many cyanobacteria die; decomposed by heterotrophic bacteria. Consume available oxygen

Eutrophication