Plant's developmental decision to either abort a flower or set seed

A significant proportion of flowers in crop plants fail to produce seeds, particularly under heat and drought stress. This outcome reflects a regulated developmental process of reproductive abortion, shaped by a complex interplay of genetic, hormonal, and environmental factors that limit crop yield. Unlike abscission, reproductive abortion can occur at multiple developmental stages. In this review, we examine how internal and external cues disrupt the development of florets, ovules, embryos, and seeds in major food crops, including cereals, legumes, and brassicas, under both optimal and stress conditions. Drawing from research in arabidopsis and extending to crop systems, we identify conserved and crop-specific mechanisms, highlight critical knowledge gaps, and propose strategies to enhance reproductive resilience and seed set under abiotic stresses.