Inactivation of Photosystem II and Turnover of the D1-Protein by Light and Heat Stresses
The photosynthetic electron flow activity is sensitive to physiological stress conditions such as light, heat, cold or water stress1,2. Interestingly, photosystem I (PS I) is not as sensitive as photosystem II (PS II), and in most cases, PS I continues to operate normally under conditions in which PS II activity is completely inhibited. As plants are exposed to stress conditions in their natural habitats, the questions arise as to what are the molecular mechanisms of the stress induced inactivation of PS II and whether there are physiological processes in the chloroplasts which may protect the photosynthetic electron flow activity of PS II from the specific damage induced by environmental stresses. Among these, the inactivation of PS II by light and heat stress have been extensively studied using the green alga Chlamydomonas reinhardtii.
KeywordsHeat Stress Specific Damage Heat Shock Condition Chlamydomonas Cell Photosynthetic Electron Flow
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