Work

Effects of exogenous melatonin on morphology, photosynthetic physiology, and yield of spring soybean variety Suinong 26 under drought stress

Year: 2021

Type: article

Abstract: It is of great significance to study the mechanism of improving the drought resistance ability of soybean seedlings for the growth of soybean seedlings in Northeast China. This experiment was conducted using ‘Suinong 26’ as the experimental material with four treatments to investigate the physiological indexes and yield of soybean under drought stress, including the normal nutrient solution (CK), the drought stress treatment (D), the drought stress + foliar spraying melatonin treatment (LM), and the drought stress + irrigation melatonin treatment (RM). The results indicated that the gas exchange parameters, the dry matter accumulation of organ at seedling stage, the activities of antioxidant enzyme, and the content of soluble protein were increased under LM and RM compared with D. The net photosynthetic rate and stomatal conductance were significantly increased at V2 and V4 stages, and the transpiration rate and intercellular carbon dioxide concentration were significantly increased at V4 stage with P < 0.05; POD and CAT of RM were significantly increased at P < 0.05; the content of soluble protein was significantly increased after drought stress at V2 and V4 stages at P < 0.05. Compared with D, the yield of soybean with LM at V2 and V4 stages was increased by 24.2% and 19.1% at P < 0.05, RM increased by 38.6% and 56.3% at P < 0.05. Compared with LM, the yield of soybean with RM at V2 and V4 stages was increased by 11.6% and 31.3% at P < 0.05. These results revealed that the application of melatonin increased the yield of soybean under drought stress and the yield of soybean with irrigation melatonin treatment was higher than that of foliar spraying melatonin treatment.

Source: ACTA AGRONOMICA SINICA

DOI: 10.3724/sp.j.1006.2021.04154