Epigenetic Regulation of Plant Stress Responses

Plants deploy epigenetic mechanisms to sense, respond and adapt to environmental challenges without altering their DNA sequence. These mechanisms include DNA methylation, histone post-translational modifications and nucleosome remodelling, which collectively control chromatin accessibility. Acetylation of histone tails by histone acetyltransferases (HATs) usually promotes an open chromatin state and gene activation, whereas removal of acetyl groups by histone deacetylases (HDACs) and addition of repressive marks such as H3K27 trimethylation lead to chromatin compaction and transcriptional silencing. Dynamic interplay among these modifications underpins stress memory and transient responses, enabling plants to balance growth and defence under drought, salinity, temperature extremes and pathogen attack. Integration of metabolic signals with chromatin-modifying complexes further fine-tunes gene expression in response to fluctuating conditions. Recent technical advances in genome-wide profiling and proteomics have revealed multi-layered epigenetic networks that govern transcriptome plasticity, offering promising avenues for the development of stress-resilient crops.

Research from Nature Portfolio

Recent studies have uncovered a nuclear module in rice whereby an ATP-citrate lyase subunit interacts with a histone acetyltransferase to generate localised acetyl-CoA pools. This targeted acetyl-CoA production drives site-specific histone lysine acetylation, coupling energy metabolism to chromatin remodelling. The mechanism ensures precise activation of proliferation and stress-responsive genes in developing tissues, illustrating how metabolic status directs epigenetic modifications to support growth and adaptation.

Epigenetic Regulation of Plant Stress Responses publication trend

The graph below shows the total number of articles in epigenetic regulation of plant stress responses across all publications each year (not limited to Nature Index journals).

Technical terms

DNA methylation: Addition of methyl groups to cytosine bases, often leading to transcriptional silencing.

Histone acetylation: Attachment of acetyl groups to lysine residues on histone tails, associated with chromatin decompaction and gene activation.

Histone deacetylase (HDAC): Enzymes that remove acetyl groups from histones, promoting chromatin compaction and gene repression.

H3K27me3: Trimethylation of lysine 27 on histone H3, a repressive epigenetic mark involved in long-term gene silencing.

Chromatin remodelling: Dynamic rearrangement of nucleosome positioning to regulate DNA accessibility for transcription.

Acetyl-CoA: A central metabolite that serves as the donor of acetyl groups for histone acetylation, linking metabolism to epigenetic regulation.

References

1. ACL and HAT1 form a nuclear module to acetylate histone H4K5 and promote cell proliferation. Nature Communications (2023).
2. Histone Deacetylase Complex 1 and histone 1 epigenetically moderate stress responsiveness of Arabidopsis thaliana seedlings. New Phytologist (2023).
3. Essential angiosperm-specific subunits of HDA19 histone deacetylase complexes in Arabidopsis. The EMBO Journal (2025).
4. Epigenetic switch from repressive to permissive chromatin in response to cold stress. Proceedings of the National Academy of Sciences of the United States of America (2018).