Drought is a common abiotic stress factor that seriously affects crop production in some parts of the world, particularly in arid and semi-arid regions. Deficiency of water is one of the main factors that lead to decrease in agriculture productivity. Almond nut trees ( Prunus amygdalus ) have been grown commercially in Iran for many years. Despite almond has been justify; MARGIN: 0in 0in 0pt; unicode-bidi: embed; DIRECTION: ltr" Key Words: Prunus dulcis , paclobutrazol, jasmonic acid, Drought, physiological parameters.