PJB-2019-593
Exogenous Jasmonic Acid and Humic Acid Increased Responses of Sorghum Seedling to Salinity Stress
Adam Yousif Adam Ali
Abstract
Salt stress is one of the main environmental stresses affecting crop growth and productivity. This experiment was designed to determine the effects of jasmonic acid (JA) (0, 5 and 10 mM) and humic acid (HA) (0, 3 and 6 g HA kg-1 soil) on some growth characteristics of forage sorghum (Sorghum bicolor L. Moench) seedling under different salinity levels (0, 100 and 200 mM NaCl). The results showed that emergence and seedling growth characteristics were significantly affected by the application of exogenous jasmonic acid, humic acid, and their interactions. At 200 mM NaCl salinity stress, JA at high level (10 mM) increased emergence seedling percentage (ESP), emergence seedling rate (ESR), total fresh weight (TFW), seedling vigor index (SVI) and salt tolerance index (STI) by 12.6%, 34.1%, 30.9%, 9.2% and 1.6%, respectively, relative to the control. Moreover, at 200 mM NaCl, the application of 6 g HA kg-1 soil increased root length (RL), total dry weight (TDW), SVI, STI, and shoot length (SL) by 13.2%, 53.3%, 11.3%, and 10.5%, respectively. In the interaction between the JA and HA, the highest ESP was recorded at the 6 g HA kg-1 soil with 10 JA, and the highest value of ESR was recorded at 6 g HA kg-1 soil with 0 mM JA. While the highest value of SL was (42.8cm) recorded at the 6g HA kg-1 soil with 5 mM JA and the highest value of TFW was (2.17g) recorded at the 3 g HA kg-1 soil with 10 mM JA. Our study suggested that the interaction between HA and JA could efficiently protect early seedlings from salt stress damage and alleviate abiotic stress.
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