Ozturk, MunirUnal, Bengu Turkyilmaz2024-11-072024-11-072023978-032391883-1978-032391420-8https://doi.org/10.1016/B978-0-323-91883-1.00001-2https://hdl.handle.net/11480/11657As sessile organisms, plants have to cope with various stress factors in their environment. Drought is the most widespread abiotic stress factor and plants may undergo some morphological, cellular, physiological, biochemical, and transcriptomics changes in alleviating it. When exposed to drought, many primary and secondary metabolites with osmoprotectant or antioxidant properties as well as phytohormones are synthesized. Phytohormones and phytometabolites are thought to play a key role in development and yield in plants under drought stress. With the exogenous application of these, the amounts of endogenous phytohormones and phytometabolites increase, and the protection rate of plants from the effects of drought improved. This chapter highlights recent developments in drought tolerance caused by exogenous applications. © 2023 Elsevier Inc. All rights reserved.eninfo:eu-repo/semantics/closedAccessAbiotic stressesExogenous treatmentPlant growth regulatorsSecondary metabolitesStress toleranceBook Chapter11210.1016/B978-0-323-91883-1.00001-22-s2.0-85160123724N/A