Photoheterotroph

Photoheterotrophs (pronunciation: /ˌfoʊtoʊˈhɛtəroʊˌtroʊf/, from the Greek φῶς phōs "light", ἕτερος heteros "another, different", and τροφή trophē "nourishment") are microorganisms that use light for energy, but cannot use carbon dioxide as their sole carbon source. Consequently, they use organic compounds from the environment to satisfy their carbon requirements; these may include fatty acids, carbohydrates, and alcohols.

Characteristics

Photoheterotrophs can be either bacterial or archaeal. They are unique in that they use light energy to produce ATP but they cannot use carbon dioxide as their sole carbon source. This differentiates them from photoautotrophs, which can use carbon dioxide as their sole carbon source.

Types of Photoheterotrophs

There are two main types of photoheterotrophs: purple non-sulfur bacteria and green non-sulfur bacteria. Both types are capable of using light energy to produce ATP but they require organic compounds for their carbon source.

Role in the Environment

Photoheterotrophs play a crucial role in the carbon cycle, particularly in the recycling of organic compounds. They are also important in the nitrogen cycle, as some photoheterotrophs are capable of nitrogen fixation.

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Photoheterotroph