Abstract
Using mature cotyledonary explants of Fraxinus mandshurica, an efficient plant regeneration system was developed via somatic embryogenesis. More than 67 % of mature cotyledons of zygotic embryos yielded 23–159 somatic embryos (SEs) per explant when incubated on medium consisting of half-strength Murashige and Skoog (MS) salts and vitamins (MS1/2) supplemented with 8.88 μM 6-benzyladenine (BA), 26.84 μM naphthaleneacetic acid (NAA), 75 g L−1 sucrose, and 400 mg L−1 casein hydrolysate (CH). Approximately, 82 % of induced SEs were observed on browning cotyledonary explants. Histological studies of cotyledon explants at various stages of somatic embryogenesis revealed that the SEs originated from single epidermal cells and developed to the globular, heart, torpedo, and cotyledonary stage embryos. Secondary somatic embryos (SSEs) formed on the surface of radicle tips of the SEs. Addition of low concentrations of NAA and 200–400 mg L−1 CH to MS1/2 medium increased SSE induction. Cotyledonary SSEs were cultured on MS1/2 medium with 10 mM abscisic acid in the presence of light to promote maturation, and >92 % of mature SSEs were able to germinate with normal shoots. After 8 weeks in culture in the presence of light on medium with one-third of the MS macroelements as well as 0.06 μM NAA, >94 % of the germinated SSEs converted into plantlets. Plantlets acclimatized successfully to ex vitro conditions and developed normal phenotypes under field conditions.
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Abbreviations
- 1/3MS:
-
Medium with one-third strength of the macroelements of MS
- 2,4-D:
-
2,4-Dichlorophenoxyacetic acid
- ANOVA:
-
Analysis of variance
- BA:
-
6-Benzyladenine
- CH:
-
Casein hydrolysate
- IBA:
-
Indole-3-butyric acid
- MANOVA:
-
Multivariate analysis of variance
- MS:
-
Medium of Murashige and Skoog (1962)
- MS1/2:
-
Medium with one-half-strength of all elements of MS
- NAA:
-
Naphthaleneacetic acid
- PGR:
-
Plant growth regulator
- SAM:
-
Shoot apical meristem
- SE:
-
Somatic embryo
- SSE:
-
Secondary somatic embryo
- ZE:
-
Zygotic embryo
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Acknowledgments
This research was supported by China Postdoctoral Science Foundation (2012T50320; 20110491015), Fundamental Research Funds for the Central Universities of China (DL10BA04), and Postdoctoral Science Foundation of Heilongjiang Province of China (LBH–10284). We thank Dr. Robert L. Geneve from Department of Horticulture, University of Kentucky, for his proofreading of our revised manuscript. We thank all the colleagues in our lab for constructive discussion and technical support.
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Yang, L., Bian, L., Shen, Hl. et al. Somatic embryogenesis and plantlet regeneration from mature zygotic embryos of Manchurian ash (Fraxinus mandshurica Rupr.). Plant Cell Tiss Organ Cult 115, 115–125 (2013). https://doi.org/10.1007/s11240-013-0345-8
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DOI: https://doi.org/10.1007/s11240-013-0345-8