Evolution of photosynthesis | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-23

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Evolution_of_photosynthesis


00:01:14 1 Origin
00:04:11 2 Symbiosis and the origin of chloroplasts
00:06:02 3 Evolution of photosynthetic pathways
00:06:59 3.1 Concentrating carbon
00:09:36 3.2 Evolutionary record
00:12:34 3.3 When is Csub4/sub an advantage?
00:14:56 4 See also



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SUMMARY
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The evolution of photosynthesis refers to the origin and subsequent evolution of photosynthesis, the process by which light energy synthesizes sugars from carbon dioxide, releasing oxygen as a waste product. The process of photosynthesis was discovered by Jan Ingenhousz, a Dutch-born British physician and scientist, first publishing about it in 1779.The first photosynthetic organisms probably evolved early in the evolutionary history of life and most likely used reducing agents such as hydrogen or  electrons, rather than water. There are three major metabolic pathways by which photosynthesis is carried out: C3 photosynthesis, C4 photosynthesis, and CAM photosynthesis. C3 photosynthesis is the oldest and most common form. C3 is a plant that uses the calvin cycle for the initial steps that incorporate CO2 into organic material. C4 is a plant that prefaces the calvin cycle with reactions that incorporate CO2 into four-carbon compounds. CAM is a plant that uses crassulacean acid metabolism, an adaptation for photosynthesis in arid conditions. C4 and CAM Plants have special adaptations that save water.