Journal of Photoscience

한국광과학회 (Korean Society of Photoscience)
권호 표지

Photodynamic Action by Endogenous Non-Chlorophyll Sensitizer As a Cause of Photoinhibition

  • Suh, Hwa-Jin (School of Agricultural Biotechnology, Seoul National University) ;
  • Kim, Chang-Sook (Harmful Algal Biology Division, National Fisheries Research and Development Institute) ;
  • Jin Jung (School of Agricultural Biotechnology, Seoul National University)
  • 발행 : 2000.09.01
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초록

As sunlight not always optimized for every terrestrial plant in terms of light quality, quantity and duration, some plants suffer detrimental effects of sunlight exposure under certain conditions. Photoinhibition of photosynthesis is a typical phenomenon representing harmful light effects, commonly observed in many photosynthetic organisms. It is generally accepted that functional, structural loss of photosystem II complex(PSII) is the primary event of photoinhibition. Accumulating data also suggest that singlet oxygen($^1$O$_2$) is the main toxic species directly involved in it. There are two different views on the specific site and mechanism of $^1$O$_2$ production in the photosynthetic membrane. One of them favors the PSII reaction center, where the primary charge pairs recombination occurs as a prerequisite for the generation of $^1$O$_2$, and the other inclines to photosensitized $^1$O$_2$ formation by a substance located outside PSII. This article describes how we, as the advocators of the latter concept, have arrived at the conclusion that $^1$O$_2$ immediately involved in PSII photodamage is largely generated from the Rieske center of the cytochrome b$_{6}$/f complex and diffuses into PSII, attacking the reaction center subunits.s.

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