What is the Difference Between Oxygenic and Anoxygenic Photosynthesis?

What is the Difference Between Oxygenic and Anoxygenic Photosynthesis?

Photosynthesis is a process of converting solar energy into chemical energy that can be stored in chemical bonds as adenosine triphosphate (ATP).

This free-energy storage allows organisms to gather and store the energy that they need. One way plants do this is by using oxygenic photosynthesis, which uses water and carbon dioxide to make glucose and oxygen.

This process releases oxygen into the atmosphere. Anoxygenic photosynthesis, on the other hand, uses light without water to create hydrogen and carbon dioxide.

This process does not release oxygen into the atmosphere but rather removes carbon dioxide from it.

Photosynthesis occurs as a result of light striking a chloroplast and enabling photosynthesis to convert light into chemical energy that can be used by plants to create glucose from carbon dioxide and water. There are two types of photosynthesis, oxygenic and anoxygenic.

Oxygenic photosynthesis, which is used by plants on land, requires light and oxygen to occur. Anoxygenic photosynthesis, which is used by bacteria and other organisms in the absence of light, does not require oxygen.

Which bacteria perform anoxygenic photosynthesis?

A wide spectrum of microorganisms do anoxygenic photosynthesis. Green sulfur bacteria such as Chlorobium (which do not employ rubisco), green nonsulfur bacteria such as Chloroflexus, purple sulfur bacteria such as Thiospirillum, and purple nonsulfur bacteria are the main categories (e.g., Rhodobacter).

Why do bacteria show anoxygenic photosynthesis?

Because none of the anoxygenic phototrophic bacteria can use water as an electron donor (or oxidize water), they must undergo photosynthesis on sulfide, hydrogen, or organic substrates.

As a result, these bacteria’s photosynthesis is deprived of oxygen.

Can eukaryotes do anoxygenic photosynthesis?

Eukaryotes and cyanobacteria carry out oxygenic photosynthesis, producing oxygen, whereas other bacteria carry out anoxygenic photosynthesis, which does not produce oxygen.

Is anoxygenic photosynthesis cyclic?

Anoxygenic photosynthesis can occur as a cyclic process. The electron transport chain of anoxygenic phototrophs is cyclic, meaning the electrons used during photosynthesis are fed back into the system, therefore no electrons are left over to oxidize water into oxygen.

Examples of  anoxygenic photosynthesis bacteria

Anoxygenic photosynthesis is performed by various types of bacteria, including green sulfur bacteria, green and red filamentous anoxygenic phototrophs (FAPs), phototrophic purple bacteria, phototrophic acidobacteria, and phototrophic heliobacteria.

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