In the context of climate change and anthropogenic activities, escalating abiotic stresses, such as extreme temperatures, drought, salinity, exposure to genotoxic substances, and heavy metals, pose significant challenges to plant health, impacting growth and productivity. The survival of plants under these fluctuating conditions relies upon their ability to perceive and respond to various abiotic stresses, which collectively constitute significant constraints on plant growth and agricultural productivity worldwide. Focusing on roots in the context of abiotic stress is crucial, given their pivotal role in water and nutrient uptake. Roots exhibit remarkable plasticity, allowing them to adapt their development in response to environmental cues. Understanding the molecular mechanisms underlying root responses to stress is essential for improving crop resilience. Arabidopsis, a widely used model organism, serves as an ideal system to investigate the molecular pathways that regulate root responses to abiotic stresses. This chapter examines how different types of abiotic stresses influence root development by activating signaling pathways in Arabidopsis. These pathways control the expression of stress-responsive genes and shape root architecture, enabling plants to cope with environmental challenges. Comprehending these molecular mechanisms provides potential strategies for enhancing crop resilience in the face of climate change and a foundation for engineering stress-tolerant crops.