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Unformatted text preview: Notes 4/9/10 The Phylogeny of Bacteria > 80 phyla discovered; Fig 15.1 shows overview of major phyla for which laboratory cultures have been obtained. The proteobacteria largest and most metabolically diverse of all phyla of Bacteria group includes all known forms of microbial physiology physiology and phylogeny not necessarily linked subdivided by 16S homology into , , , and subdivisions each containing many genera and species. Members of different subdivisions often have physiologic traits in common o Phototrophy in three different subdivisions o Nitifying bacteria span 4 subdivisions plus separate phylum PHOTOTROPHIC, CHEMOLIT HOTROPH IC AND METHANOTROPH IC PROTEOBACTERIA Anoxygenic photosynthesis o Anoxigenic photosynthesis also found in the green sulfur bacteria, the green nonsulfur bacteria and gram-positive heliobacteria Sulfur-, iron-, hydrogen- or nitrogen-dependent chemolithotrophy Methane oxidation Purple phototrophic bacteria Key genera: Chromatium, Ectothiorhodospira, Rhodobacter, Rhodospirillum Anoxygenic photosynthesis Morphologically diverse...
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