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Plastids in a Pinch: Coordinating Stress and Developmental Responses Through Retrograde Signalling.

Elizabeth van Veen¹, Jesse J Küpers¹, Charlotte M M Gommers¹

¹Laboratory of Plant Physiology, Wageningen University and Research, the Netherlands.

Plant, Cell & Environment

|June 6, 2025

Summary

Plastids, essential for plant growth, send signals to the nucleus about their status under environmental stress. Understanding these retrograde signals is key to improving plant resilience to abiotic stressors.

Keywords:

abiotic stress chloroplasts environmental adaptation gene expression regulation genomes uncoupled photosynthesis plant development retrograde signalling

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Area of Science:

Plant Biology
Molecular Biology
Stress Physiology

Background:

Plastids, including chloroplasts, are vital for plant growth, energy production, and physiological processes.
Plastids rely on nucleus-encoded proteins and communicate their status to the nucleus via retrograde signals.
Environmental factors like drought, salinity, and light/temperature extremes impact plastid function and trigger these signals.

Purpose of the Study:

To review the current understanding of plastid responses to environmental stimuli.
To highlight the role of retrograde signaling in mediating plant adaptation to abiotic stress.
To explore the impact of retrograde signals on nuclear gene expression and plant morphology.

Main Methods:

Literature review focusing on plastid retrograde signaling.
Analysis of studies on chloroplast responses to environmental triggers.
Synthesis of knowledge on signaling pathways influenced by plastid-derived signals.

Main Results:

Retrograde signals originate from plastid metabolism, gene expression, and redox balance.
These signals modulate nuclear gene expression to fine-tune plastid function and plant morphology.
Current knowledge is largely based on artificial stressors, with less understanding of natural environmental relevance.

Conclusions:

Plastid retrograde signaling is a critical mechanism for plant adaptation to environmental stress.
Further research is needed to understand the role of these signals in natural environments and enhance plant stress resilience.
Understanding plastid responses to abiotic stress is crucial for improving crop yields and sustainability.