In the light reactions, pigment molecules in photosystems capture photons of light, and energy from light becomes stored as potential energy in ATP and NADPH.
What is light reaction?
- The photosynthetic mechanism known as the "light reaction" transforms solar energy into chemical energy in the form of NADPH and ATP.
- The production of NADPH and high-energy ATP molecules occurs during the light-dependent stage, in which chlorophyll absorbs light energy.
- This excitation of some pigment-molecule electrons to higher energy levels causes them to leave the chlorophyll and move through a succession of molecules.
- The photolysis reactions, also referred to as light reactions, transform solar energy into chemical energy in the form of ATP and NADPH.
- The thylakoid membranes of organelles called chloroplasts are where the light reactions occur.
- The light reactions are largely controlled by photosystems, sizable complexes of proteins and pigments (light-absorbing molecules) that are designed to capture light.
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