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Recurrent somatic embryogenesis and development of somatic embryos in Akebia trifoliata (Thunb.) Koidz (Lardizabalaceae)

  • Shuaiyu Zou
  • Xiaohong Yao
  • Caihong Zhong
  • Dawei Li
  • Zupeng Wang
  • Hongwen HuangEmail author
Original Article
  • 21 Downloads

Abstract

A simple and effective protocol was established for recurrent somatic embryogenesis and plant regeneration in Akebia trifoliata (Thunb.) Koidz. Somatic embryos directly formed from the root zone of the immature zygotic embryos cultured on MS medium devoid of plant growth regulator (PGR). The induction frequency of immature zygotic embryos was 52.5%, and the mean number of somatic embryos reached up to 19.5. Secondary somatic embryos arose on the primary embryos at a high frequency (95.8%), and this process maintained in a recurrent way on PGR-free MS medium. The highest mean number of somatic embryos also appeared in the primary embryos which can reach up to 44.7. While both of the embryogenic potential and mean number of embryos per explant displayed a gradual diminution with subculturing. The addition of 0.5 mg l−1 6-benzyladenine in the 1/2 MS regeneration medium can significantly improve the frequency of somatic embryos convert to plantlets. The microscopic analysis revealed that the development process of somatic embryos via the globular, heart, torpedo and cotyledonal stages in A. trifoliata, the histological analysis showed that somatic embryos directly initiated from root epidermal cells and there are no vascular connections between the somatic embryos and maternal tissue. Regenerated plantlets acclimated successfully to greenhouse conditions. Approximately 65% plantlets survived and displayed no morphological characteristics differences with seed-derived plants. The simple and effective protocols established in this study will promote large-scale clonal propagation and genetic improvement of A. trifoliata.

Key message

Somatic embryogenesis has never been reported in Akebia trifoliata (Thunb.) Koidz. The study showed the origin and development process of somatic embryos in Akebia trifoliata (Thunb.) Koidz.

Keywords

Akebia trifoliata Somatic embryogenesis Somatic embryos Development Hormone-free medium 

Notes

Acknowledgements

This work was supported by the Plant Germplasm Innovation Program, Science and Technology Service Network Initiative, Chinese Academy of Sciences (ZSZC-007).

Author contributions

HH conceived and designed the experiments, SZ carried out the study and wrote a draft, HH and XY revised the manuscript, CZ, DL, ZW contributed to the writing of the manuscript. All authors read and approved the manuscript final version.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflicts of interest.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  • Shuaiyu Zou
    • 1
    • 2
    • 3
  • Xiaohong Yao
    • 4
  • Caihong Zhong
    • 4
  • Dawei Li
    • 4
  • Zupeng Wang
    • 4
  • Hongwen Huang
    • 1
    • 2
    Email author
  1. 1.Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical GardenThe Chinese Academy of SciencesGuangzhouChina
  2. 2.Guangdong Provincial Key Laboratory of Applied BotanyGuangzhouChina
  3. 3.College of Life SciencesUniversity of Chinese Academy of SciencesBeijingChina
  4. 4.Key Laboratory of Plant Germplasm Enhancement and Speciality Agriculture, Wuhan Botanical GardenThe Chinese Academy of SciencesWuhanChina

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