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.
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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
© SISEF - The Italian Society of Silviculture and Forest Ecology 2022
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