Climate change is threatening the world's agricultural systems. High temperatures, drought, salinity, greenhouse gas emissions, and more are abiotic stresses that hinder plants' ability to survive. Thus, it is vitally important that science designs and develops strategies to help plants not only survive stress but also thrive under stressful conditions. Plant Abiotic Stress Responses and Tolerance Mechanisms provides a comprehensive overview of plant morpho-physiological, biochemical, and molecular responses to different abiotic stresses. It includes seven chapters that address such topics as current challenges and future threats of plant abiotic stresses, regulatory networks in plants under abiotic stresses, plant adaptation to temperature extremes and salinity, plant secondary metabolites and stress tolerance, and the role of phytohormones in plant stress tolerance.