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Article: Amplified degradation of photosystem II D1 and D2 proteins under a mixture of photosynthetically active radiation and UVB radiation: Dependence on redox status of photosystem II
- Article from:
- Photochemistry and Photobiology
- Article date:
- May 1, 1999
- Author:
CopyrightCopyright American Society of Photobiology May 1999. Provided by ProQuest LLC. (Hide copyright information)
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ABSTRACT
Plants exposed to a mixture of photosynthetically active radiation (PAR) and UVB radiation exhibit a marked boost in degradation of the D1 and D2 photosystem II (PS II) reaction center proteins beyond that predicted by the sum of rates in PAR and UVB alone (amplified degradation). Becausee degradation driven by visible or UVB radiation alone is uncoupled from PS II redox status, it was therefore assumed that the mixed-light-amplified component of degradation would behave similarly. Surprisingly, amplified degradation proved to be coupled tightly to the redox status of PS II. We show that inactivation of the PS II water oxidation by heat shock or oxidation of the plastosemiquinone ...
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