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Somatic embryogenesis from mature zygotic embryos of Distylium chinense (Fr.) Diels and assessment of genetic fidelity of regenerated plants by SRAP markers

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Abstract

The objective was to establish an efficient regeneration protocol for Distylium chinense based on somatic embryogenesis and evaluate the genetic stability of plants regenerated in vitro. To induce callus mature zygotic embryos were cultured on Murashige and Skoog’s (MS) medium that was supplemented with different concentrations of 2,4-dichlorophenoxyacetic acid (2,4-D) and N6-benzyladenine (BA). After 20 days, the highest rate of callus formation (88.9 %) occurred on MS medium supplemented with 0.5 mg l−1 2,4-D and 0.1 mg l−1 BA. It was observed that light-yellow, compact, dry, nodular embryogenic calli had formed. These calli were then subcultured on fresh MS medium supplemented with 0.1 mg l−1 BA and 0.5 mg l−1 α-naphthaleneacetic acid (NAA) for proliferation for an additional 30 days. To induce somatic embryos and plant regeneration, the embryogenic callus was transferred to fresh MS medium that was supplemented with different concentrations of BA and NAA. After 30 days, 0.5 mg l−1 BA in combination with 0.5 mg l−1 NAA produced the best result in terms of somatic embryogenesis (%), shoot differentiation (%), number of shoots per callus and shoot length. Next, the plantlets were transferred to the field for 5 weeks and a 95 % survival rate was observed. The sequence-related amplified polymorphism markers confirmed genetic stability of plants regenerated in vitro. To our knowledge, this is the first report that describes a plant regeneration protocol for D. chinense via somatic embryogenesis to be used for germplasm conservation and commercial cultivation.

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Abbreviations

MS:

Murashige and Skoog’s (1962) medium

2,4-D:

2,4-Dichlorophenoxyacetic acid

BA:

N6-benzyladenine

NAA:

α-Naphthaleneacetic acid

SE:

Somatic embryo

ZE:

Zygotic embryo

CTAB:

Cetyltrimethylammonium bromide

SRAP:

Sequence-related amplified polymorphism

OD:

Outside diameter

PFD:

Photon flux density

EtBr:

Ethidium bromide

DMRT:

Duncan’s Multiple Range Test

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Acknowledgments

This work was financed by the National Natural Science Foundation of China (Grant Number 51209122), partially funded by the outstanding young talents project of Educational Commission of Hubei Province of China (Project Number Q20121302) and by Graduate Student Innovation Grant (Grant Number 2012CX081). The authors thank Mr. Scott D. Bruni for the critical review of the manuscript.

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Authors and Affiliations

  1. Engineering Research Center of Eco-Environment in Three Gorges Reservoir Region, Ministry of Education, China Three Gorges University, Yichang, 443002, China

    Xiaoling Li, Xuesong Wang, Chunyan Luan, Jin Yang, Suihan Cheng, Zelong Dai & Pengsen Mei

  2. Three Gorges Botanical Garden, Yichang, 443111, Hubei, China

    Chengming Huang

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  1. Xiaoling Li
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  2. Xuesong Wang
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  3. Chunyan Luan
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  4. Jin Yang
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  5. Suihan Cheng
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  6. Zelong Dai
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  7. Pengsen Mei
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  8. Chengming Huang
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Correspondence to Xiaoling Li.

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Li, X., Wang, X., Luan, C. et al. Somatic embryogenesis from mature zygotic embryos of Distylium chinense (Fr.) Diels and assessment of genetic fidelity of regenerated plants by SRAP markers. Plant Growth Regul 74, 11–21 (2014). https://doi.org/10.1007/s10725-014-9892-1

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