Photoinhibition
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Photoinhibition is the process by which the capacity for photosynthesis in plants is reduced in strong light (above the light saturation point). It occurs due to damage to one of the photosystems (photosystem II (P680)) by excess irradiance.
Excess absorbed light energy, that cannot exit the photosystem via electron transfer, causes highly reactive free oxygen radicals to form, damaging the photosystem. Particularly vulnerable is one of the main core proteins of photosystem II, protein D1, encoded by the gene psbA.
