The effect of foliar application of amino acids alanine, proline and glutamine on some morphophysiological and enzymatic properties of coriander (Coriandrum sativum L.)

Amino acids are biological stimulants that has an effective role in improving the metabolism, growth and performance of plants. In this research, the effect of amino acids alanine, proline and glutamine on some growth, physiological and enzymatic characteristics of coriander (Coriandrum sativum L.) was investigated. this experiment was carried out as a completely random statistical design in three replications in a greenhouse located in Garmsar city. The foliar application of alanine, proline and glutamine with concentrations of zero, 50 and 100 mg l-1 were applied in two stages of 2 to 4 leaves and 4 to 6 leaves. The results showed that the treatments significantly increased the evaluated traits compared to the control, so that the highest percentage of cell membrane stability index and protein amount, the activity of superoxide dismutase, catalase and peroxidase enzymes were in 100 mg l-1 proline treatment, the highest amount of fresh and dry weight shoots and roots and the amount of nitrogen were in 100 mg l-1 glutamine treatment, and the highest total chlorophyll content of leaf were in 100 mg l-1 alanine treatment. Therefore, according to the results of this research, foliar application of alanine, proline and glutamine, especially with a concentration of 100 mg l-1, can be recommended to improve the morphophysiological and enzymatic properties of coriander.