Definition of photosystem in English:

photosystem

Line breaks: photo|system
Pronunciation: /ˈfəʊtəʊˌsɪstəm
 
/

noun

  • A biochemical mechanism in plants by which chlorophyll absorbs light energy for photosynthesis. There are two such mechanisms ( photosystems I and II) involving different chlorophyll-protein complexes.
    More example sentences
    • In photosystem II, a different chlorophyll-protein complex absorbs light at the wavelength of 680 nm.
    • Both types of photosystems differ in size, pigment and protein composition, and charge.
    • In higher plant chloroplasts, many pigment-binding proteins are inserted into the thylakoid membrane and organized into multisubunit complexes called photosystems.

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