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iForest - Biogeosciences and Forestry

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Physiological dormancy and dormancy release of Sassafras tzumu, a colored-leaf tree species with high landscape and economic value

Hongzhi Chen, Jingmin Jiang, Jun Liu   , Zifeng Tan, Yanjie Li

iForest - Biogeosciences and Forestry, Volume 15, Issue 5, Pages 349-355 (2022)
doi: https://doi.org/10.3832/ifor4031-015
Published: Sep 01, 2022 - Copyright © 2022 SISEF

Research Articles


Sassafras tzumu is one of the most valuable tree species in southern China. However, the dormancy of the seed limits its seedling quality. In order to improve the germination percentage of seeds, characteristics, causes of dormancy, changes in endogenous hormones and nutrients during storage were investigated. The results showed that seed viability was 78.11%, and the highest water absorption rate was 26.09%. The germination percentage of the embryo without cotyledon was 21.13%, but intact seed and embryo could not germinate on hormone-free medium. Seed embryo and coat extracts were found to have a significant inhibitory effect on seed germination. Germination percentage were significantly positively correlated to free amino content (p < 0.01) and negatively correlated to soluble sugar content (p < 0.05) during storage. The levels of GA3 and GA3/ABA had significant effects on the germination percentage of S. tzumu seed storage at 4°C. The results suggest that S. tzumu seeds are in intermediate physiological dormancy at maturity and are mainly caused by the presence of inhibitory substances in the seed tissues. Furthermore, changes in endogenous hormones and metabolism of nutrients at 4°C can significantly promote the release from dormancy of S. tzumu seeds.

  Keywords


Sassafras tzumu, Seed Dormancy, Wet Sand Storage, Phytohormones, Nutrients

Authors’ address

(1)
Hongzhi Chen
Jingmin Jiang
Jun Liu 0000-0003-2365-9214
Zifeng Tan
Yanjie Li 0000-0001-7750-757X
Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Fuyang 311400 (China)

Corresponding author

 

Citation

Chen H, Jiang J, Liu J, Tan Z, Li Y (2022). Physiological dormancy and dormancy release of Sassafras tzumu, a colored-leaf tree species with high landscape and economic value. iForest 15: 349-355. - doi: 10.3832/ifor4031-015

Academic Editor

Federica Brunoni

Paper history

Received: Dec 02, 2021
Accepted: Jul 05, 2022

First online: Sep 01, 2022
Publication Date: Oct 31, 2022
Publication Time: 1.93 months

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