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

Authors : Yagut M. Allakhverdieva

Pages : 11-17

View : 15 | Download : 8

Publication Date : 9999-12-31

Article Type : Makaleler

Abstract :Heat inactivation of various photosynthetic electron transport reactions were investigated in the presence/absence of glycinebetaine (betaine) in unstacked thylakoid membranes from spinach. The activity of Photosystem II (PS II) is more sensitive to heat than that of Cytochrome bf (cyt.bf) and Photosytem I (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.