Kobra Mahdavian - Assistant Professor, Department of Biology, Faculty of Science, Payame Noor University, Tehran, Iran

Soil salinity is one of the most common abiotic stresses that negatively affects crop growth. Salinity leads to osmotic stress, production of reactive oxygen species, oxidative damage to cells and their metabolic processes, and ultimately reduced crop yield. Phytohormones play an important role in reducing abiotic stresses in plants. Triacontanol is a long-chain primary alcohol first discovered in alfalfa and acts as a plant growth regulator to improve growth in crops. Its external application promotes growth, nutrient uptake, photosynthetic pigments, soluble proteins, sugars and free amino acids in plants. Triacontanol reduces the toxic effects of plants under abiotic stresses by increasing growth, photosynthetic pigments and enzymatic antioxidant activity. Considering the different physiological and biochemical rols of triacontanol in plants under salinity stress, it is very desirable to study its role and mode of action. It has been reported that a concentration of ۱۰ mM triacontanol increases physiological processes under salinity stress in soybean. Concentrations of ۵۰ and ۱۰۰ μM triacontanol also increased shoot and root length, fresh and dry weight under salinity stress in sunflower. Therefore, external application of triacontanol can increase the tolerance of plants under salinity stress

Plant growth regulator, Growth parameters, Phytohormone