Putrescine impact in increasing the tolerance of plants to drought stress on some of Biochemical Parameters in wheat

In order to investigate the resistance of different wheat cultivars under drought stress, a factorial experiment was conducted in a completely randomized design with three replications. The first factor was drought stress at three levels (85%, 65% Field Capacity and control) and second factor includes ten wheat cultivars (Line 27, Kuhdasht, Zagros, Line 24, Gonbad, Line 28, Line 40, Line 39, Line 25 and Line 23) and the third factor was consisted of putrescin spraying with concentrations (0, 0.088 and 0.176 g / L-1). Foliar application of Putrescine was applied to the pots in a three leaf plants. One day after application of Putrescin's spray solution, drought stress was applied based on field capacity and one week after placement of the plant in the desired stress sample was taken. For this purpose, total protein, soluble sugars, lysine and methionine amino acids, anthocyanin pigments and antioxidant enzymes (catalase, peroxidase and polyphenoloxidase) and proline were evaluated. Studies have shown that, under putrescin treatment, increased the concentration of amino acids proline and carbohydrates, which plays a fundamental role in plant defense mechanisms. Catalase and peroxidase activity decreased with increasing putrescine concentration and polyphenoloxidase activity increased in Kohdasht, Line 23, Line 24, Line 25, Line 27, Line 39 and Line 40 and decreased in Gonbad, Zagros and Line 28 cultivars. Also, with increasing drought stress, protein content increased in Gonbad, Kouhdasht, Line 25, Line 27 and Line 28 and decreased in Zagros, Line 23, Line 24, Line 39 and Line 40 respectively.