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

Ning WANG; Shanshan XU

doi:10.15835/nbha51213198

Authors

Ning WANG WangHenan University of Science and Technology, College of Horticulture and Plant Protection, 263 Kaiyuan Avenue of Luoyang, 471023, Luoyang (CN)
Shanshan XU Henan University of Science and Technology, College of Horticulture and Plant Protection, 263 Kaiyuan Avenue of Luoyang, 471023, Luoyang (CN)

DOI:

https://doi.org/10.15835/nbha51213198

Keywords:

dormancy, endogenous hormones, enzyme activity, Eucommia ulmoides, germination, seed

Abstract

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

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