The Plant Mind: Unraveling Abiotic Stress Priming, Memory, and Adaptation.

Abstract

Plants exhibit a remarkable capacity to adapt to recurrent abiotic stresses, prompting a re-evaluation of traditional views on plant responses to environmental challenges. This review explores the intricate mechanisms of stress priming, memory, and adaptation in plants. Specifically, it details the molecular and physiological processes underlying abiotic stress priming, which serve as a gateway to understanding plant memory. Stress priming fosters resilience against diverse stressors through interconnected pathways involving hormone signaling, transcriptional regulation, DNA methylation, histone modifications, and small RNAs. These epigenetic changes orchestrate stress-responsive gene expression and can, in some cases, be passed on to future generations. This review distinguishes between somatic memory, intergenerational effects, and transgenerational inheritance to avoid conceptual overlap. By connecting short-term priming to long-term adaptation and potential heritability, this article proposes a paradigm shift in how plant resilience is understood, with significant implications for crop improvement under climate stress.