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Improving the germination of somatic embryos of Picea morrisonicola Hayata: effects of cold storage and partial drying

  • Original Article
  • Published:
Journal of Forest Research

Abstract

Mature somatic embryos (SEs) of Taiwan spruce (Picea morrisonicola Hay.) were harvested from embryogenic tissues incubated on a filter paper laid on an abscisic acid (ABA)-containing medium. The effects of cold storage and partial drying on embryo germination and on reduction of embryo ABA content were determined. Percentage germination was low (<10 %) and hyperhydricity was high (>86.8 %) for mature SEs (control). Both cold storage and partial drying significantly reduced this physiological abnormality. Germination increased to 49.1 % for SEs that received cold-storage treatment, and their ABA content was reduced to a trace amount (2.4 ± 1.1 µg/g dw). Germination increased to 58.1 % for SEs partially dried for 7 days, and the ABA content was relatively high (62.8 ± 21.7 µg/g dw). Hyperhydricity-induced failure to germinate among SEs containing low levels of ABA is discussed. Histological study revealed vigorous differentiation in the root apical meristem of SE during partial drying. This advanced development also accounted for the enhanced germination performance compared with other treatments. A combination treatment (partial drying and cold storage) increased percentage germination even further (69.9 %) and more effectively reduced hyperhydricity (18.7 %) during SE germination.

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Acknowledgments

We are grateful to Drs Ching-Te Chien and Jeng-Der Chung for kindly providing us with ABA analysis equipment and technical assistance. We also thank Dr Cherng Kang Liao for his critical comments on the organization of this paper and Ms Chiung Hsiu Hsiao and Hsiao Wen Huang for their assistance with preparation of samples for microscopy and figure files.

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  1. Department of Forestry and Natural Resources, National Chiayi University, No. 300 SyueFu Rd., Chiayi, 60004, Taiwan

    Yue Ken Liao & I-Ping Juan

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  1. Yue Ken Liao
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  2. I-Ping Juan
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Correspondence to Yue Ken Liao.

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Liao, Y.K., Juan, IP. Improving the germination of somatic embryos of Picea morrisonicola Hayata: effects of cold storage and partial drying. J For Res 20, 114–124 (2015). https://doi.org/10.1007/s10310-014-0445-2

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  • DOI: https://doi.org/10.1007/s10310-014-0445-2

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