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Functional Plant Biology Functional Plant Biology Society
Plant function and evolutionary biology
REVIEW

Past trauma, better future: how stress memory shapes plant adaptation to drought

Md. Mezanur Rahman https://orcid.org/0000-0001-8822-9683 A B * , Sanjida Sultana Keya A , Mallesham Bulle C , S.M. Ahsan D E , Md. Abiar Rahman B F , Md. Shyduzzaman Roni G , Md. Mahmud Al Noor H and Mehedi Hasan E
+ Author Affiliations
- Author Affiliations

A Institute of Genomics for Crop Abiotic Stress Tolerance, Department of Plant and Soil Science, Texas Tech University, Lubbock, TX 79409, USA.

B Department of Agroforestry and Environment, Gazipur Agricultural University, Gazipur 1706, Bangladesh.

C School of Plant, Environmental, and Soil Sciences, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, USA.

D Department of Plant Medicals, Andong National University, Andong 36729, Republic of Korea.

E Department of Agriculture, Gopalganj Science and Technology University, Gopalganj 8100, Bangladesh.

F CIFOR-ICRAF Bangladesh, GAU Campus, Gazipur 1706, Bangladesh.

G Department of Horticulture, Gazipur Agricultural University, Gazipur 1706, Bangladesh.

H Plant Breeding Division, Bangladesh Institute of Nuclear Agriculture, Mymensingh, 2202, Bangladesh.

* Correspondence to: mrahman@gau.edu.bd

Handling Editor: Sajid Fiaz

Functional Plant Biology 52, FP24355 https://doi.org/10.1071/FP24355
Submitted: 25 December 2024  Accepted: 23 April 2025  Published: 15 May 2025

© 2025 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Can plants remember drought? Emerging evidence suggests that prior stress exposure leaves an epigenetic imprint, reprogramming plants for enhanced resilience. However, the stability and functional relevance of drought memory remain unresolved. This review synthesizes recent advances in epigenetic modifications, transcriptional reprogramming, and metabolic priming, critically assessing their roles in plant stress adaptation. DNA methylation dynamically reshapes chromatin landscapes, yet its transient nature questions its long-term inheritance. Histone modifications, particularly H3K9ac and H2Bub1, may encode stress signatures, enabling rapid transcriptional responses, whereas small RNAs fine-tune chromatin states to reinforce memory. Beyond epigenetics, physiological priming, including osmotic adjustments, antioxidant defenses, and hormonal crosstalk, introduces further complexity, yet its evolutionary advantage remains unclear. Root system plasticity may enhance drought resilience, but its metabolic trade-offs and epigenetic underpinnings are largely unexplored. A critical challenge is disentangling stable adaptive mechanisms from transient acclimatory shifts. We propose a framework for evaluating drought memory across temporal and generational scales and highlight the potential of precision genome editing to establish causality. By integrating multi-omics, gene editing, and field-based validation, this review aims to unlock the molecular blueprint of drought memory. Understanding these mechanisms is key to engineering climate-resilient crops, ensuring global food security in an era of increasing environmental uncertainty.

Keywords: crop improvement, DNA methylation, drought resilience, epigenetics, histone modifications, root adaptations, small RNAs, stress memory.

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