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.
ALLAKHVERDIEVA, YAGUT M.; MAMEDOV, MAHIR D.; and GASANOV, RALPHREED A. (2001) "The Effect of Glycinebetaine on the Heat Stability of Photosynthetic Reactions in Thylakoid Membranes," Turkish Journal of Botany: Vol. 25: No. 1, Article 2. Available at: https://journals.tubitak.gov.tr/botany/vol25/iss1/2