Reproductive Resilience in Plants Under Abiotic Stress: Integrating Metabolic Reprogramming, Hormonal Crosstalk, and Genetic Regulation : Review Article

Abstract

Reproductive success ultimately determines plant fitness and crop productivity. At the same time, reproductive stages are among the most stress-sensitive phases of the plant life cycle. This chapter brings together current knowledge on stress-resilient reproduction by integrating metabolic, hormonal, genetic, and breeding perspectives to explain why reproductive development represents a critical bottleneck under abiotic stress conditions. Key processes, including floral induction, meiosis, gametophyte formation, fertilization, and early seed development, occur within narrow developmental windows. These stages require sustained metabolic investment and, once disrupted, show little capacity for recovery. As a result, environmental stresses such as heat, drought, salinity, and cold often lead to irreversible fertility losses, even when vegetative growth appears relatively unaffected. The chapter systematically examines how different abiotic stresses interfere with reproductive physiology and identifies common points of vulnerability across stress types. These include defective gametogenesis, fertilization failure, and premature seed abortion. Particular attention is given to metabolic reprogramming as a central adaptive response, with carbohydrate, nitrogen, lipid, and redox pathways playing key roles in maintaining reproductive function under stress. In this context, phytohormonal networks emerge as an important integrative layer, translating stress signals into reproductive outcomes through finely regulated hormonal crosstalk. In parallel, the chapter discusses the contribution of genetic and epigenetic regulatory mechanisms to reproductive stability under adverse conditions. Transcription factors, molecular chaperones, chromatin modifications, and non-coding RNAs collectively help buffer reproductive development against environmental perturbations. Building on these mechanistic insights, recent advances in breeding strategies, genomic selection, genome editing, and synthetic biology are evaluated for their potential to enhance reproductive resilience. Emphasis is placed on the need for stage-specific and field-relevant approaches rather than uniform stress tolerance solutions. Finally, the chapter situates reproductive stress tolerance within the broader context of climate change and sustainable agriculture, highlighting the protection of plant reproduction as a central requirement for ensuring future food security