文献类型：期刊文献

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

作者：Chen, Hongzhi[1] Jiang, Jingmin[1] Liu, Jun[1] Tan, Zifeng[1] Li, Yanjie[1]

第一作者：Chen, Hongzhi

通信作者：Liu, J[1]

机构：[1]Chinese Acad Forestry, Res Inst Subtrop Forestry, Fuyang 311400, Peoples R China

年份：2022

卷号：15

起止页码：349-355

外文期刊名：IFOREST-BIOGEOSCIENCES AND FORESTRY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000856539800001)】；

基金：Acknowledgments HC designed the study, conducted the ex- periment, and wrote the manuscript; JL, JJ and YL supervised the experiments at all stages and reviewed the manuscript; ZT supported the experimental material col- lection. All authors read and approved the final manuscript. This research was supported by the For- estry science and technology innovation project of Jiangxi Forestry Department (201804) and the Zhejiang Science and Technology Major Program on Agricultural New Variety Breeding (2021C02070-7) .

语种：英文

外文关键词：Sassafras tzumu; Seed Dormancy; Wet Sand Storage; Phytohor-mones; Nutrients

摘要：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 percent-age 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 degrees 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. Further-more, changes in endogenous hormones and metabolism of nutrients at 4 degrees C can significantly promote the release from dormancy of S. tzumu seeds.