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Scientia Silvae Sinicae ›› 2023, Vol. 59 ›› Issue (3): 84-93.doi: 10.11707/j.1001-7488.LYKX20210457

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Effects of Dehydration Modes and Storage Time on Germination of Castanopsis sclerophyllaSeeds

Suping Zeng1(),Yueqiao Li1,Ru Liu1,*,Jia Wang1,Meifang Zhao2,Huacong Zhang1   

  1. 1. Experimental Center of Subtropic Forestry, Chinese Academy of Foresty Xinyu 336600
    2. Faculty of Life Science and Technology, Central South University of Forestry and Technology Changsha 410004
  • Received:2021-06-21 Online:2023-03-25 Published:2023-05-27
  • Contact: Ru Liu E-mail:948266173@qq.com

Abstract:

Objective: The optimal dehydration and low temperature storage conditions are still the difficulties in the research of recalcitrant seeds. In this study, the seed vigor under different dehydration methods and low temperature storage conditions was investigated, in order to provide theoretical basis and technical support for the collection and preservation of recalcitrant seeds in subtropical areas. Method: In this study, Castanopsis sclerophylla seeds were used as the experimental materials, and the germination ability of seeds before and after dehydration and cold storage was compared. The seeds were subjected to the different storage temperature (room temperature 20 ℃ and low temperature 4 ℃), and the treatment time (7, 14, 30, 60, 90 d), as well as different dehydration rate (fast and slow) and dehydration time (1, 2, 4, 8, 12, 24, 48, 96 h). The germination rate and germination index of the seeds under the interaction between low temperature and dehydration were analyze , to explore the effect of the interaction between dehydration methods and cold storage on seed germination. Result: 1) The results showed that low temperature storage, dehydration time and their interaction had significant effects on seed germination rate and germination index. 2) When stored at room temperature, the germination rate and germination index of seeds subjected to rapid dehydration were significantly increased compared with the non-dehydrated seeds. 3) Compared with unrefrigerated seeds, the cold storage treatment inhibited the germination of rapidly dehydrated seeds, but had no significant effect on the germination rate of undehydrated and slowly dehydrated seeds for 1-48 h, however the seeds almost lost vigor after slow dehydration for 96 h. The germination rate of unrefrigerated seeds was the highest (68.80%) after rapid dehydration, but it decreased significantly after refrigeration. The germination rate and germination index of seeds were significantly decreased after 30 days of cold storage. 4) Under the same cold storage (except for 30 d), the germination rate and germination index of seeds treated with short-term rapid dehydration were significantly higher or had no significant difference compared with those without dehydration, while the seeds vigor greatly reduced or lost when prolonged dehydration time. The germination rate and germination index of seeds with slow dehydration were generally significantly lower than those of undehydrated seeds. Conclusion: During storage at room temperature, rapid dehydration significantly promotes seed germination. There is an interaction between low temperature storage and dehydration treatment. Short-term rapid dehydration and cold storage treatment are conducive to the seed germination, while cold storage and slow dehydration treatment inhibit seed germination. C. sclerophylla seeds can be stored under both rapid dehydration at room temperature and short-term rapid dehydration at 4 ℃.

Key words: Castanopsis sclerophylla, recalcitrant seeds, dehydration, cold storage, germination

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