Photoprotection in plants: a new light on photosystem II damage

Trends Plant Sci. 2011 Jan;16(1):53-60. doi: 10.1016/j.tplants.2010.10.001. Epub 2010 Nov 1.


Sunlight damages photosynthetic machinery, primarily photosystem II (PSII), and causes photoinhibition that can limit plant photosynthetic activity, growth and productivity. The extent of photoinhibition is associated with a balance between the rate of photodamage and its repair. Recent studies have shown that light absorption by the manganese cluster in the oxygen-evolving complex of PSII causes primary photodamage, whereas excess light absorbed by light-harvesting complexes acts to cause inhibition of the PSII repair process chiefly through the generation of reactive oxygen species. As we review here, PSII photodamage and the inhibition of repair are therefore alleviated by photoprotection mechanisms associated with avoiding light absorption by the manganese cluster and successfully consuming or dissipating the light energy absorbed by photosynthetic pigments, respectively.

Publication types

  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Manganese / metabolism
  • Photosynthesis
  • Photosystem II Protein Complex / radiation effects*
  • Plant Leaves / radiation effects
  • Plants / metabolism
  • Plants / radiation effects*
  • Sunlight*


  • Photosystem II Protein Complex
  • Manganese