The Effect of Glycinebetaine on the Heat Stability of Photosynthetic Reactions in Thylakoid Membranes

Authors : Yagut M ALLAKHVERDIEVA

Pages : 11-17

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Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Heat inactivation of various photosynthetic electron transport reactions were investigated in the presence/absence of glycinebetaine insert ignore into journalissuearticles values(betaine); in unstacked thylakoid membranes from spinach. The activity of Photosystem II insert ignore into journalissuearticles values(PS II); is more sensitive to heat than that of Cytochrome bf insert ignore into journalissuearticles values(cyt.bf); and Photosytem I insert ignore into journalissuearticles values(PS I); complexes. The data obtained clearly demonstrated the protection of PS II and PS I electron transfer by betaine under high temperatures. The phenomena observed are probably related to the stabilization of the higher-order structures of PS II and PS I by betaine.
Keywords : Electron transport, heat stress, glycinebetaine