Abstract
Efficient regeneration via somatic embryogenesis (SE) would be a valuable system for the micropropagation and genetic transformation of sugar beet. This study evaluated the effects of basic culture media (MS and PGo), plant growth regulators, sugars and the starting plant material on somatic embryogenesis in nine sugar beet breeding lines. Somatic embryos were induced from seedlings of several genotypes via an intervening callus phase on PGo medium containing N6-benzylaminopurine (BAP). Calli were mainly induced from cotyledons. Maltose was more effective for the induction of somatic embryogenesis than was sucrose. There were significant differences between genotypes. HB 526 and SDM 3, which produced embryogenic calli at frequencies of 25–50%, performed better than SDM 2, 8, 9 and 11. The embryogenic calli and embryos produced by this method were multiplied by repeated subculture. Histological analysis of embryogenic callus cultures indicated that somatic embryos were derived from single- or a small number of cells. 2,4-dichlorophenoxyacetic acid (2,4-D) was ineffective for the induction of somatic embryogenesis from seedlings but induced direct somatic embryogenesis from immature zygotic embryos (IEs). Somatic embryos were mainly initiated from hypocotyls derived from the cultured IEs in line HB 526. Rapid and efficient regeneration of plants via somatic embryogenesis may provide a system for studying the molecular mechanism of SE and a route for the genetic transformation of sugar beet.
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Abbreviations
- BAP :
-
N6-Benzylaminopurine
- 2,4-D:
-
2,4 Dichlorophenoxyacetic acid
- GA3 :
-
Gibberellic acid
- IEs:
-
Immature zygotic embryos
- IAA:
-
3-Indole acetic acid
- K:
-
Kinetin
- MS:
-
Murashige and Skoog
- NAA:
-
1-Naphthalene acetic acid
- PGR:
-
Plant growth regulator
- SE:
-
Somatic embryogenesis
- TDZ:
-
Thidiazuron or N-phenyl-N′-1,2,3-thiadiazol-5-ylurea
- TIBA:
-
2,3,5-Triiodobenzoic acid
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Acknowledgements
The authors are grateful to MAFF and De Montfort University for supporting the project. We thank Dr. E. S. Mutasa-Göttgens for her comments on the paper.
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Zhang, CL., Chen, DF., Kubalakova, M. et al. Efficient somatic embryogenesis in sugar beet (Beta vulgaris L.) breeding lines. Plant Cell Tiss Organ Cult 93, 209–221 (2008). https://doi.org/10.1007/s11240-008-9364-2
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DOI: https://doi.org/10.1007/s11240-008-9364-2