<p>Plants, as sessile organisms, have evolved highly integrated molecular, biochemical, and physiological networks that enable them to detect, interpret, and adapt to changing environmental stresses, including drought, salinity, heat, heavy metals, and pathogen attack. Increasing evidence indicates that these adaptive plant responses extend beyond immediate stress acclimation, enabling plants to retain a form of biological memory that enhances their capacity to respond more efficiently and rapidly upon re-exposure. Stress memory is established through the coordinated action of action of multiple regulatory layers, including epigenetic modifications, chromatin remodelling, small RNA-mediated regulation, redox signaling, physiological adjustments, metabolic adjustment and hormonal reprogramming. Stable molecular signatures, such as stress-induced DNA methylation patterns (particularly CHH methylation mediated through the RNA-directed DNA methylation (RdDM) pathway), histone modifications, Persistent changes in chromatin accessibility stress-responsive small RNAs, ROS dynamics, and long-lasting alterations in primary and secondary metabolism collectively contribute to memory formation. When these molecular changes mechanistically linked to enhanced re-stress responses, regarded as reliable biomarkers of stress memory. The effect of stress memory extends beyond molecular regulation to influence plant physiology and development. Traits such as enhanced root architecture, stomatal regulation, improved photosynthetic recovery and accelerated post growth recovery represent the functional outcomes of these underlying molecular and biochemical processes. In certain cases, epigenetic marks and small RNA signatures may persist through meiosis, enabling stress adaptive traits to be transmitted to the next generation and contributing to transgenerational stress memory. A comprehensive understanding of these interconnected biomarkers offers valuable opportunities for predicting plant resilience under adverse environmental condition. Such knowledge can facilitate the development of epigenetic-assisted crop breeding, stress priming interventions, improved phytoremediation approaches, and biomarker based early warning systems for climate resilient agriculture. Future research should prioritize on rigorous biomarker validation of candidate biomarkers, multi-omics integration, AI-based predictive modelling, and evaluation of ecological and evolutionary consequences associated with stress memory. Overall, stress-responsive biomarkers provide an essential mechanistic link between environmental perception with and long-term adaptive responses, offering practical tools for enhancing crop productivity and plant performance under variable and challenging environmental conditions.</p> Graphical abstract <p></p>