Worldwide warming is anticipated to have a typically terrible impact on plant development because of the harmful impact of excessive temperatures on plant improvement. Plants' diversity and productivity are adversely suffering from abiotic environmental factors. Thermal /heat stress is now becoming the main concern for plants everywhere, Major reason behind this is sudden changes in weather and climate which affects medicinal plants around the world and will eventually cause the destruction of some key species. The growing risk of climatological extremes such as very excessive temperatures might result in a catastrophic lack of crop productiveness and bring about extensive famine. Within the boom situation of plant life, several secondary metabolites are produced with the aid of them to serve a ramification of cell capabilities vital for physiological approaches, and the latest growing proof has implicated stress reaction. The medicinal plants comprise bioactive PSNPs, which perform a key role in plant life with the altering environment and stress condition. Within past decades, various studies advertised the healing properties and biological activities of medicinal plants. Excessive levels of pressure in medicinal vegetation exploitation caused by abiotic stress outcomes with the production of ROS inside the cell chambers of a plant cell which ultimately have a tremendous effect on secondary metabolite production. In this article, we have focused on what is the role of secondary metabolite and ROS generation in protecting the plant under the high stressful condition of heat.
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