Effect of jasmonic acid on total amino acids,proline and enzymes activity of Karela (Momordica charantia) under salinity stress

Stress is defined as changes in natural factors relative to optimal conditions, which cause a decrease in growth and yield in plants. Stress is naturally divided into biotic and abiotic. One of the most important abiotic stress is salinity that causes large changes in plants. Jasmonic acid as a phytohormone plays an important role in regulating the processes of plant growth and response to different biotic and abiotic stresses. Momordica charantia is an herbal medicinal plant of the Cucurbitaceae family. In this study, the effect of various concentrations of jasmonic acid (0, 0.05, 0.15, 0.5 and 1 mM) and salinity (0, 50, 100, 150 and 300 mM) on total amino acids, proline and activities of ascorbate peroxidase, catalase, and pyrogallol peroxidase and polyphenol oxidase enzymes in Momordica charantia were investigated. The results showed that salinity stress decrease growth and increased total amino acids, proline and ascorbate peroxidase, catalase, pyrogallol peroxidase and polyphenol oxidase activities. Jasmonic acid prevents the growth reduction and increases the total amino acids, proline and the activities of the pyrogallol peroxidase and polyphenol oxidase enzymes. Therefore, this hormone can play a very important role in decrease the effects of salinity stress in this plant

Keywords:

Salt stress , Momordica charantia , Jasmonic acid