Effects of Primary Dormancy-released Status and Drying Treatment on Germination of Fraxinus mandshurica Seeds

doi:10.7525/j.issn.1673-5102.2020.04.002

Abstract

Abstract: In order to explore the effects of different primary dormancy-released status and drying treatment on the germination of Fraxinus mandshurica seeds, we used mature F.mandshurica seeds with primary dormancy to study different naked stratification(warm stratification for 10 weeks and cold stratification for 8 weeks, warm stratification for 12 weeks and cold stratification for 8 weeks, warm stratification for 10 weeks and cold stratification for 10 weeks, warm stratification for 12 weeks and cold stratification for 10 weeks) and drying treatment(drying or not drying) of F.mandshurica seed germination performance under suitable temperature and higher temperature conditions. The results showed that the germination of F.mandshurica seeds with different primary dormancy-released status was similar at different temperatures, and the germination of the seeds was affected by drying treatment. The more fully the seeds without drying breaking the primary dormancy were, the stronger their germination ability was. However, if the dormancy-released seeds were subjected to the drying treatment, the more dormancy was released(especially the longer low temperature time), the more the seed germination ability decreased. The induction of secondary dormancy(hot dormancy) of F.mandshurica seeds was less affected by the state of seed primary dormancy breaking, but was more affected by the drying treatment. Drying treatment can reduce the germination ability of F.mandshurica seeds, especially under higher temperature conditions, and the more fully breaking the primary dormancy, the greater the impact of drying treatment on seed germination. In the production, if the dormancy-released seeds need to be re-dried, the best method of stratification is warm stratification for 10 weeks and cold stratification for 8 weeks.

Key words: Fraxinus mandshurica, naked stratification, seed germination, drying, secondary dormancy

CLC Number:

S722.1

LU Yan, YAN Yue, CUI Cheng-Cheng, ZHANG Peng. Effects of Primary Dormancy-released Status and Drying Treatment on Germination of Fraxinus mandshurica Seeds[J]. Bulletin of Botanical Research, 2020, 40(4): 490-495.

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