The Green Bacteria

The green bacteria are Gram-negative organisms that are typically green or brownish in color. Unlike the purple bacteria, their accessory pigments are located in structures called chloro-somes and their cytoplasmic membranes do not have extensive invaginations. ■ accessory pigments, p. 156

Green Sulfur Bacteria

The green sulfur bacteria are found in habitats similar to those preferred by the purple sulfur bacteria. Like the purple sulfur bacteria, they use hydrogen sulfide as a source of electrons for reducing power and they form sulfur granules. Those granules, however, form outside of the cell (figure 11.6). The green sulfur bacteria lack flagella, but many have gas vesicles. All are strict anaerobes, and none can use a chemotrophic metabolism. Representative genera include Chlorobium and Pelodictyon.

Green Non-Sulfur Bacteria

The green non-sulfur bacteria are characterized by their filamentous growth. Metabolically, they resemble the purple non-sulfur bacteria, preferentially using organic compounds to generate reducing power. As an alternative, they can use hydrogen gas or hydrogen sulfide. In addition, they can grow in the dark aerobically using chemotrophic metabolism. Chloroflexus is the only genus in this group that has been grown in pure culture.

5 mm

Figure 11.6 Green Sulfur Bacteria Note that the sulfur granules are extracellular.

5 mm

Figure 11.6 Green Sulfur Bacteria Note that the sulfur granules are extracellular.

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