The Role of Electrical Potential in Light-Induced Swelling and Shrinkage of Thylakoid Membranes
Light-induced conformational change of thylakoids was widely studied in the 60’,-70’s[l]. Recently, the curiosity to understand the regulatory process of photosynthesis in vivo has led people to work on this topic again. It has been demonstrated that the shrinkage of thylakoids is induced by ΔpK and osmotic movement of weak organic acids across thylakoid membrane. However, it has not been reported hitherto that the electrical potential involves in the light-induced conformational change of thylakoids. Electrical potential formation of thylakoid membranes under light has been studied for many years. But the regulation of photosynthetic electron transport by electrical potential was not identified until 80’s. In this paper, we studied the effects of electrical potential on light-induced conformational change of thylakoids, and found that a decline of electrical potential will induce or increase the light-induced shrinkage of thylakoid in medium without or with weak organic acids.
KeywordsElectrical Potential Thylakoid Membrane Photosynthetic Electron Transport Absorbance Change Intact Chloroplast
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