Archives of Current Research International

The climate is becoming more stressful and is causing extreme heat stress events, which are challenging the productivity of agricultural activities and the survival of plants across the world. Osmolytes, which are organic and inorganic compatible solutes, are important biochemical adaptations by which plants can endure high temperatures. The study aims to review osmolyte-mediated heat stress tolerance for the understanding of climate-resistant agricultural systems. The mechanism of action of these molecules is a combination of interlinked processes such as osmotic adjustment, protein stabilisation, membrane protection, and reactive oxygen species scavenging. Large volume osmolytes (proline, glycine betaine, trehalose, mannitol and polyamines) are concentrated significantly during heat stress, ensuring cellular homeostasis and metabolic life support. There is highly developed research on the topic that has shown that osmolyte biosynthesis is controlled by multifaceted signalling pathways that comprise transcriptional factors, kinases, and epigenetic alterations. Osmolytes, when exogenously applied, have proven to have impressive potential in improving thermotolerance in various crop species. This is a full-scale review of the current knowledge regarding osmolyte-mediated heat stress alleviation, considering the molecular pathways, metabolism, genetic control, as well as biotechnological use.  The new developments in osmolyte accumulation engineering were examined by use of transgenic methods and molecular breeding. Knowledge of such complex protective functions helps in generating climate-resistant cultivars that can be sustained to produce under rising temperatures of thermal stress. It is recommended that implementation should focus on regulatory systems, economic feasibility, and adoption mechanisms for farmers—particularly vulnerable smallholder groups in climate-stressed regions.