THE MECHANISMS OF OXYGEN REDUCTION IN CHLOROPLASTS. POSSIBLE INFLUENCE OF H₂O₂ PRODUCTION PLACE ON ITS SIGNALING FUNCTION

Original title

МЕХАНИЗМЫ ВОССТАНОВЛЕНИЯ О2 В ХЛОРОПЛАСТАХ. ВОЗМОЖНОЕ ВЛИЯНИЕ МЕСТА ОБРАЗОВАНИЯ Н₂О₂ НА ЕЕ СИГНАЛЬНУЮ ФУНКЦИЮ

Authors

Ivanov B.N., Borisova-Mubarakshina M.M., Kozuleva M.A., Naydov I.A., Vetoshkina D.V.

Contact information

Institute of Basic Biological Problems, Russian Academy of Sciences, Pushchino, Russia, e-mail: Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.

Pages

44-46

DOI

10.31255/978-5-94797-318-1-44-46

Abstract

Superoxide radicals being formed during the reduction of O₂ by either ferredoxin, or FS1 terminal acceptors on the surface of the membrane, or stromal oxidases are converted in the stroma of chloroplast into hydrogen peroxide, H₂O₂, in a reaction catalyzed by superoxide dismutase, as well as as a result of the reduction by ascorbate. We have shown that H₂O₂ can be formed in the light also within thylakoid membrane, and that with increasing light intensity, the total formation of H₂O₂ during the operation of the photosynthetic electron transport chain increases due to this process. We assume that the location of H₂O₂ formation, namely, within or outside the thylakoid membrane is important for the specificity of its signaling action, and that H₂O₂, which is formed within the thylakoid with the plastoquinone pool participation provides retrograde signaling, providing the adaptation systems of photosynthetic cells with the information about redox-state of the PQ-plastoquinone pool.