Univrsity of Tehran Press Iranian Journal of Field Crop Science 2008-4811 52 3 2021 09 23 Effects foliar spraying of abscisic acid and melatonin on Salicornia europaea L. morphological characteristics and yield components under salinity stress Effects foliar spraying of abscisic acid and melatonin on Salicornia europaea L. morphological characteristics and yield components under salinity stress 175 188 84621 10.22059/ijfcs.2020.299512.654703 FA Mehrnesa Qarehkhani Plant Breeding and Biotechnology Dept, Gorgan University of Agriculture Sciences and Natural Resources, Iran Hassan Soltanlooh Plant Breeding and Biotechnology Dept, Gorgan University of Agriculture Sciences and Natural Resources, Iran Hassan Mokhtarpour Plant Physiologic Dept, Agriculture and Natural Resources Research Center Golestan. Gorgan. Sanaz Ramezanpour Plant Breeding and Biotechnology Dept, Gorgan University of Agriculture Sciences and Natural Resources, Iran Sarah Khorasaninejad Horticultural Sciences, Plant Production Faculty, Gorgan University of Agriculture Sciences and Natural Resources, Iran Masoud Mashhadi Akbar Boojar Department of Cell and Molecular Biology, Faculty of Biological sciences, Kharazmi University, Tehran, Iran Elaheh Tavakol Plant Breeding and Biotechnology Dept, Shiraze University of Agriculture, Shiraze, Iran Journal Article 2020 04 04 Importance of Salicornia as a halophyte plant is the ability to grow in saline and irrigated areas with unusual and highly saline water. In order to investigate the effect of phytohormones for salinity adjustment on vegetative and physiological traits of <em>Salicornia europaea</em> L., an experiment was conducted in a greenhouse located in Gorgan, Iran. The experiment was conducted as a factorial experiment in a completely randomized design with three replications. The first factor was different salinity levels (0, 400 and 600 mM) and the second factor was hormone treatment (without hormone, 50 mM abscisic acid, 50 mM melatonin, and the combination of both hormones) that applied asaerial spraying. Interaction of salinity and hormones on shoot height, branch number, shoot and root wet weight, seed weight, spike and total shoot dry weights of Salicornia at 1% (P <0.01) and shoot height and ion leakage (LE) at the 5% (P <0.05) 400 mM salinity and combination of abscisic acid and melatonin increased the maximum yield, grain weight and spike and total shoot dry weights 110% (1.1 fold), 195% (19.5 fold) and 245% (24.5 fold), respectively,. The highest of the most of the studied traits were obtained at 400 mM salinity and combination of abscisic acid and melatonin. Correlation coefficient  between shoot fresh weight and root fresh and total shoot dry weights at 1% and between numbers of branches, spike dry weight and grain weight at 5% were significant.Foliar application of abscisic acid and melatonin can help the plant to tolerate salinity and increase its functional properties (especially melatonin in yield components). Importance of Salicornia as a halophyte plant is the ability to grow in saline and irrigated areas with unusual and highly saline water. In order to investigate the effect of phytohormones for salinity adjustment on vegetative and physiological traits of <em>Salicornia europaea</em> L., an experiment was conducted in a greenhouse located in Gorgan, Iran. The experiment was conducted as a factorial experiment in a completely randomized design with three replications. The first factor was different salinity levels (0, 400 and 600 mM) and the second factor was hormone treatment (without hormone, 50 mM abscisic acid, 50 mM melatonin, and the combination of both hormones) that applied asaerial spraying. Interaction of salinity and hormones on shoot height, branch number, shoot and root wet weight, seed weight, spike and total shoot dry weights of Salicornia at 1% (P <0.01) and shoot height and ion leakage (LE) at the 5% (P <0.05) 400 mM salinity and combination of abscisic acid and melatonin increased the maximum yield, grain weight and spike and total shoot dry weights 110% (1.1 fold), 195% (19.5 fold) and 245% (24.5 fold), respectively,. The highest of the most of the studied traits were obtained at 400 mM salinity and combination of abscisic acid and melatonin. Correlation coefficient  between shoot fresh weight and root fresh and total shoot dry weights at 1% and between numbers of branches, spike dry weight and grain weight at 5% were significant.Foliar application of abscisic acid and melatonin can help the plant to tolerate salinity and increase its functional properties (especially melatonin in yield components). https://ijfcs.ut.ac.ir/article_84621_725486cc2477697ef96038333cb6da32.pdf