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Seed dormancy and germination characteristics in relation to the regeneration of Acer pycnanthum, a vulnerable tree species in Japan

  • Original Article
  • Published:
Journal of Forest Research

Abstract

Seed dormancy and germination characteristics of the vulnerable tree species Acer pycnanthum were investigated to understand its regeneration strategy. Seeds of A. pycnanthum mature 1 month after pollination and are dispersed in late spring. All dispersed seeds were in dormancy upon collection from which they were released by cold (5 °C) stratification over a period of at least 12 weeks. Germination percentages were higher under low temperature conditions (10–20 °C) and when the temperature was alternated in diurnal cycles. Light effects on germination were not observed. Seed viability was not lost even though seeds had experienced room temperature conditions (20–30 °C, 35–70 % humidity) after dispersal for 5–10 months. Seeds of A. pycnanthum can endure summer heat and survive until the following spring, allowing their seedlings to germinate promptly. In the case of light intensity-independent dormancy release, regeneration can occur under canopy conditions where shade-intolerant seedlings are at a disadvantage. To verify this conclusion, the shade tolerance of A. pycnanthum requires further investigation.

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Acknowledgments

We thank Takashi Masaki and Satoshi Kikuchi of the Forestry and Forest Products Research Institute for their valuable suggestions and manuscript critiques. We also thank Asako Kitazawa, Japanese Red Maple Conservation Group, for supporting seed collection in Iida City, and Mamoru Okamoto and Atsushi Suzuki, formerly with the Forestry and Forest Products Research Institute, for assistance with seed collection. This study was supported by grants from the Ministry of Environment of Japan.

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Authors and Affiliations

  1. Hokkaido Research Center, Forestry and Forest Products Research Institute, Matsunosato 1, Tsukuba, Ibaraki, 305-8687, Japan

    Ayako Kanazashi

  2. Forestry and Forest Products Research Institute, Matsunosato 1, Tsukuba, Ibaraki, 305-8687, Japan

    Teruyoshi Nagamitsu

  3. Tadami Beech Center, 2590 Machishita, Tadami, Tadami-machi, Fukushima, 968-0421, Japan

    Wajiro Suzuki

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  1. Ayako Kanazashi
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  2. Teruyoshi Nagamitsu
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  3. Wajiro Suzuki
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Correspondence to Ayako Kanazashi.

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Kanazashi, A., Nagamitsu, T. & Suzuki, W. Seed dormancy and germination characteristics in relation to the regeneration of Acer pycnanthum, a vulnerable tree species in Japan. J For Res 20, 160–166 (2015). https://doi.org/10.1007/s10310-014-0451-4

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  • DOI: https://doi.org/10.1007/s10310-014-0451-4

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