Abstract

The experiment was carried out to study the effect of gibberellic acid (GA₃) on minerals of mungbean (Vigna radiata L. Wilczek) irrigated with different levels of saline water. Salt concentration of water for treated were 0, 50, 100 and 150 mM NaCl and 200 mg/L gibberellic acid (100 mg/L as seed pre-soaking and 100 mg/L as foliar application) were used. Results showed that plants treated with saline water had higher content of sodium and chlorine and lower content of potassium and magnesium. The highest content of Cl^- of roots and shoots (10.82 and 16.40 mg mineral ion/gr dry weight, respectively) and Na⁺ of roots and shoots (16.55 and 46.15 mg mineral ion/gr dry weight, respectively) were gained from treatment number 4 (150 mM NaCl + 0 mg/L application of gibberellic acid) that significantly differed from other's (p ≤ 0.01). Also, results indicated that different levels of saline water (50, 100 and 150 mM NaCl) caused marked decreases in content of positive cations (K⁺, Ca²⁺ and Mg²⁺) and salt stress has also been found responsible for an increase of mineral distribution. At last we found that irrigation with saline water adversely affects growth and productivity of plants and application of gibberellic acid hormone overcome the effects of salt stress and improved the growth parameters.

Key words: Mungbean (Vigna radiata L. Wilczek), saline water, gibberellic acid (GA3), seed pre-soaking, foliar application.