Abstract
In clinical treatment, Pleione bulbocodioides (Franch.) Rolfe (PB) has been widely used as an anti-tumor drug. However, low productivity impeded its extensive application. The lack of endosperm in the seeds of PB led to a low natural germination rate, causing inefficient production and long reproductive cycle. Improving production and retaining clonal fidelity are the challenges in its efficient micropropagation. This study is to optimize medium and evaluate clonal fidelity on induction and differentiation of Protocorm-like Body (PLB) from PB. The effects of plant growth regulators (PGR) and natural additives on the formation and proliferation of protocorms from seeds and the induction and proliferation of PLBs were investigated. The ultra-structural were performed via a scanning electron microscope (SEM) and transmission electron microscope (TEM) and clonal fidelity assessment was conducted using histochemical assays, DNA electrophoresis analysis and Inter-simple sequence repeat (ISSR) molecular marker analysis. The optimum medium for inducing protocorm was that the Murashige and Skoog (MS) medium supplemented with 2.0 mg/L 2,4-D, 2.0 mg/L KT (Kinetin), 2.0 mg/L AgNO3, and 50 mL/L coconut water in the orthogonal experiments and validation experiments, and for inducing PLBs was that MS medium with 0.3 mg/L indole-3-butyric acid (IBA), 0.3 mg/L KT, 100 mg/L potato extract, and 1 g/L activated charcoal. The SEM and TEM showed the ultra-structural of PB had no change from protocorm to PLBs, and the DNA electrophoresis showed the total DNA did not change in different stages of PB by induction and differentiation and ISSR analysis revealed no DNA polymorphisms included bulb, PLBS, and the differentiated tissue of PLBs. In conclusion, the DNA hereditary character and ultra-structural of PB was retained using our optimum medium induction and differentiation of PLBs from PB, which will be useful for the efficient micropropagation popularization for PB.
Key message
The present work reports the DNA hereditary stability character and optimum medium for induction and differentiation of PLBs from Pleione bulbocodioides (Franch.) Rolfe (PB), which will be useful for the efficient micropropagation popularization for PB.
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Abbreviations
- PB :
-
Pleione bulbocodioides (Franch.) Rolfe
- MS:
-
Murashige and Skoog (1962) media
- PLB:
-
Protocorm-like body
- KT:
-
Kinetin
- 2,4-D:
-
2,4-Dichlorophenoxyacetic acid
- NAA:
-
1-Naphthaleneacetic acid
- IBA:
-
Indole-3-butyric acid
- 6-BA:
-
Amino purine
- TDZ:
-
Thidiazuron
- PE:
-
Potato extract
- BE:
-
Banana extract
- CW:
-
Coconut water
- SEM:
-
Scanning electron microscope
- TEM:
-
Transmission electron microscope
- ISSR:
-
Inter-simple sequence repeat
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Acknowledgements
We appreciate the great help/technical support/experimental support from the Public Platform of Medical Research Center, Academy of Chinese Medical Science, Zhejiang Chinese Medical University.
Funding
This research was supported by Zhejiang Traditional Chinese Medicine Administration (CN) (Project No. 2019ZQ009).
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FZ contributed the conception, design, drafting part of the manuscript, and final revision. WH contributed to design and drafting the manuscript. WC and JL analyzed and interpreted the data. JY and BZ designed and critical revision of the manuscript. ZD and QJ contributed to supervise and revise the manuscript. All authors read and approved the final manuscript.
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Communicated by Ming-Tsair Chan.
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11240_2021_2033_MOESM1_ESM.tif
Electronic supplementary material 1 (TIF 1003 kb) Fig S1. The reproductive process of seed to plantlets. The seeds are directly scattered on the medium 50 days (a) and then become seedlings for 70 days (b), plantlets for 88 days (c), and plantlets for 112 days (d).
11240_2021_2033_MOESM2_ESM.tif
Electronic supplementary material 2 (TIF 1086 kb) Fig S2. Proliferation of PLBs on MS with the addition of 1.0mg/L 6-BA+0.5mg/L KT+0.2mg/L NAA+0.5g/L AC culture for (a) 1 day. (b) 10 days (c) 30 days.
11240_2021_2033_MOESM3_ESM.tif
Electronic supplementary material 3 (TIF 614 kb) Fig S3. (a) Differentiation of PLBs on MS with the addition of 0.2 mg/L NAA, 2.0–2.5 mg/L 6-BA, and 1.0 g/L activated charcoal after 3 weeks of culture. (b) PLB-derived plantlets ready for potting after 4 weeks of culture. (c) Clusters of PLBs after 5 weeks of culture. (d) PLBs developed into shoot buds after 7 weeks of culture.
11240_2021_2033_MOESM4_ESM.tif
Electronic supplementary material 4 (TIF 758 kb) Fig S4. The transplanting process of the seedlings put into rooting medium, with long leaves and long seedlings, culturing for (A) 7 days, (B) 14 days (C) 28 days, (D) longer seedling were taken out and transplanted to ex-bottle culturing (E) 30 days
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Zhou, F., Huang, W., Cheng, W. et al. In vitro regeneration and clonal fidelity assessment on induction and differentiation of protocorm-like body from Pleione bulbocodioides (Franch.). Plant Cell Tiss Organ Cult 145, 625–639 (2021). https://doi.org/10.1007/s11240-021-02033-2
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DOI: https://doi.org/10.1007/s11240-021-02033-2