Revealing Missing Links in the Downsizing of the Photosystem II Antenna in Higher Plants Under Stress Conditions.

ABSTRACT: Chloroplast-to-nucleus ROS retrograde signaling is essential for acclimation of the photosynthetic apparatus to environmental stresses. One of the key mechanisms is the regulation of the photosystem II antenna size depending on light conditions and other environmental factors. However, the molecular components linking chloroplast redox status to nuclear gene regulation remain poorly defined. Here, we demonstrate that H₂O₂, generated in chloroplasts, in particular with involvement of the plastoquinone pool components, enhances the protease activity in the chloroplast envelope. As it is known, protease activity leads to the processing of the chloroplast envelope-bound transcription factor PTM, enabling its relocation to the nucleus, where it induces ABI4 expression. ABI

SUBMITTER: Nikolaev AA 

PROVIDER: S-EPMC12729535 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature