Mechanism of Photosynthesis.
Light Reaction (takes place in the thylakoids membrane).
(Energy conversion phase: formation of ATP and NADPH2)
The sunlight energy, which is absorbed by photosynthesis pigments, drives the process of photosynthesis. Photosynthesis pigments are organized into clusters, called photo systems for efficient absorption and utilization of solar energy in the thylakoids membranes.
Each photosyntem consist of a light gathering antenna complex and a reaction center. The antenna complex has many molecules of chlorophyll a chlorophyll b and carotenoids. Reaction center has one or more molecules of chlorophyll along with a primary electron acceptor, and associated electron carries of electron transport system.
Photosystem I (PS I)
Photosystem II (PS II)
These are named so in order of their discovery. Photosystem I ha chlorophyll and molecule, which absorbs maximum light of 700 nm and is called P700the reaction center of Photosystem II is P680, the form of chlorophyll a, which absorbs best the best the light of 680 nm.
In predominant types of electron transport called non-cyclic electron flow, the electrons pass through the two Photosystem (non-cyclic phosphorylation). In less common type of path called cyclic electron flow only Photosystem I is involved (cycle phosphorylation).
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