Effects of exogenous GA3 and warm water on dormancy breaking germination characteristics of Eucommia ulmoides

Seeds of the plant Eucommia ulmoides Oliver, have prominent dormant characteristics. In present study, seed dormancy and germination E. were investigated by treating them with exogenous GA3 different water temperatures. The results revealed that warm soaking treatments beneficial to breaking seeds. rate seeds treated 50℃ was 84.67%. comparison, 300 mg·L-1 had only a 45%. This low resulted probably due temperature solution. Another important reason is presence eucommia gum in coat which hinders process. During germination, SOD activity (300 mg·L-1) (50 °C) increased significantly. Increased reduced degree oxidative damage plasma membrane continuous decrease TBARS content. Thereby, prompted develop direction conducive germination. addition, (50℃) content endogenous GA3, IAA, ZR seeds, decreased ABA. significantly higher ratios GA3/ABA, IAA/ABA ZR/ABA than those distilled (room temperature) plants. short, 50 °C treatment has more marked promoting effect on