Plants are constantly challenged by changing environmental conditions. The efficient regulation of fundamental physiological processes like photosynthesis is therefore crucial for survival, fitness, and productivity. In recent decades, research has focused on explaining how chloroplasts regulate their functioning in response to light, the most important environmental cue for photosynthetic organisms. The chloroplast redox state has been identified as a key player in adjusting the performance of these organelles.

Redox homeostasis constitutes a complex network of molecular processes in which reactive molecular species, redox modifications, and redox proteins operate together to enable both physiological responses and adaptation to stressful conditions. In this regard, the chloroplast redox state regulates many processes, including electron flow in the thylakoid membrane, enzyme activity in carbon fixation and starch biosynthesis, plastid transcription, and the oxidative stress response. The redox state ensures metabolic coordination and efficient energy utilization, which is important not only under fluctuating light conditions but under salinity, drought, high temperatures, and other stresses. We are therefore interested in new studies that improve our understanding of how the chloroplast redox state affects the stress response and acclimation processes of plants and algae.

This Research Topic focuses on recent advances in understanding the role of chloroplast redox regulatory mechanisms in the stress response and environmental acclimation. Original Research Articles, Reviews, and Mini-reviews which cover the genetics, structure, and function of chloroplast redox regulatory systems under stress are welcomed. Topic subjects may include:

• Regulation of the PQ redox state
• Regulation of thiol-reducing systems
• Redox-dependent regulation of nuclear and chloroplast genes
• Redox-dependent regulation of enzyme activity
• Redox-dependent regulation of chloroplast lipid metabolism
• The interplay between redox regulatory networks and the antioxidant system
• New sensor probes for determination the chloroplast redox state

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Frontiers in Plant Science

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