<p>Plants, as sessile organisms, must adapt to a range of abiotic stresses, including drought, salinity, heat, and cold, which are increasingly exacerbated by climate change. These stresses significantly impact crop productivity, posing challenges for sustainable agriculture and food security. Recent advances in omics studies and genetics have shed light on molecular mechanisms underlying plant stress responses, including the role of calcium (Ca²⁺) signaling, liquid–liquid phase separation (LLPS), and cell wall-associated sensors in detecting and responding to environmental changes. However, gaps remain in understanding how rapid stress signaling is integrated with slower, adaptive processes. Emerging evidence also highlights crosstalk between abiotic stress responses, plant immunity, and growth regulation, mediated by key components such as RAF-SnRK2 kinase cascades, DELLA proteins, etc. Strategies to enhance crop stress resistance without compromising yield include introducing beneficial alleles, spatiotemporal optimization of stress responses, and decoupling stress signaling from growth inhibition. This review emphasizes the importance of interdisciplinary approaches and innovative technologies to bridge fundamental research and practical agricultural applications, aiming to develop resilient crops for sustainable food production in an era of escalating environmental challenges.</p>