Light is the main source of energy for photosynthesis, it underlies the production process in plants. At the same time, excessive lighting can lead to photodamage of the photosynthetic apparatus and, indirectly, of other structures of the plant cell. In order to avoid such damage, plants have developed a number of protective mechanisms, including so-called ‘non-photochemical fluorescence quenching.”
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Source: Phys.org