Light increases resistance of thylakoid membranes to thermal inactivation

Авторы: Lovyagina Elena, Luneva Oksana, Loktyushkin Aleksey, Semin Boris
Журнал: Journal of Plant Research
Том: 137
Год издания: 2024
Издательство: Springer Verlag
Местоположение издательства: Germany
Первая страница: 1189
Последняя страница: 1200
DOI: 10.1007/s10265-024-01584-7
Аннотация: AbstractIn the region of slightly acidic pH (рН 5.7), the manganese cluster in oxygen-evolving complex of photosystem II (PSII)is more resistant to exogenous reductants. The effect of such pH on the heat inactivation efficiency of the electron trans-port chain (O2 evolution and 2,6-dichlorophenolindophenol reduction) in PSII membranes and thylakoid membranes wasinvestigated. Under thylakoid membranes illumination accompanied by lumen acidification, their resistance to heat inac-tivation increases. In the presence of protonophores, the rate of heat inactivation increases, which seems to be associatednot with the protonophore mechanism, but with structural and/or functional changes in membranes. In PSII membranepreparations, the efficiency of the oxygen evolution inhibition at pH 5.7 is also lower than at pH 6.5. The role of reactiveoxygen species in thermal inactivation of photosynthetic membranes was investigated using a lipophilic cyclic hydroxyl-amine ESR spin probe.
Добавил в систему: Ловягина Елена Рудольфовна

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