Abstract
In this study, soybean seeds (Glycine max. L., cv., “A3935) were grown under controlled conditions (25±2 C) composed of different boron compounds. In the experiment, 5 groups were determined respectively as potassium tetraborate tetrahydrate (1 mg/1), ammonium tetraborate tetrahydrate (1 mg/1), sodium boron hydride (1 mg/1), lithium tetraborate tetrahydrate (100 mg/1), and sodium tetraborate decahydrate (100 mg/1). The doses used in this study were determined according to the results of a preliminary study. Soybean seeds were exposed to different amounts of drought stress based on time (control, 3, 6, 9, 12, 15, and 18 days). Activities of antioxidant enzymes superoxide dismutase (SOD: EC 1.15.1.1), glutathione reductase (GR: EC 1.6.4.2), ascorbate peroxidase (APX: EC 1.11.1.11) and catalase (CAT: EC 1.11.1.6) measured. According to the results stress+potassium tetraborate tetrahydrate environment has increased the amount of CAT, decreased the amount GR, APX and SOD. Potassium tetraborate 0.1 mg / l dose administration is the most appropriate critical value, and the most important indicator of drought CAT enzyme found to give the best results.
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