Abstract
This study demonstrated that somatic embryogenesis and de novo shoot organogenesis-based systems of root-derived Lisianthus (Eustoma grandiflorum) explants can be alternatively induced by exogenous supply of auxin or cytokinin. Somatic embryogenesis was observed when root explants were cultured in the dark on Murashige and Skoog-based medium supplemented with 10 μM 2,4-dichlorophenoxyacetic acid (2,4-D). Somatic embryos were differentiated by transferring embryonic calluses to an embryo conversion phase medium containing 2 μM 6-benzyladenine (BA) to promote full plantlet development. Regarding de novo shoot organogenesis, the addition of 4 μM of either BA or zeatin was the most effective treatment for inducing adventitious shoot buds. A detailed histological characterization of somatic embryogenesis and de novo shoot organogenesis showed that both morphogenetic processes shared the same cellular origin. The formation of somatic embryos and adventitious shoot buds occurred through the reactivation of pericycle and vascular parenchyma cells into proembryos and meristemoids, respectively, which consisted of meristematic cells with similar characteristics. These results provide further evidence of optimization of in vitro propagation as a useful approach to improve this important ornamental species.
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Acknowledgements
The authors would like to thank the Microscopy and Microanalysis Center of the Federal University of Viçosa (Viçosa, MG, Brazil) and the Brazilian funding agencies Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG), and Coordenação de Aperfeiçoamento de Pessoal de Ensino Superior (CAPES) for providing financial support.
Authors’ contributions
MY-O, ACFC, MVMP, DIR, DSB, JGB, ADK, and WCO conceived, designed, and performed the experiments; MYO raised the in vitro plants used in the experiments; MY-O, ACFC, and MVMP carried out histological analysis; MY-O, DIR, DSB, JGB, and WCO interpreted the acquired data and drafted the paper.
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Editor: Jayasankar Subramanian
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Yumbla-Orbes, M., da Cruz, A.C.F., Pinheiro, M.V.M. et al. Somatic embryogenesis and de novo shoot organogenesis can be alternatively induced by reactivating pericycle cells in Lisianthus (Eustoma grandiflorum (Raf.) Shinners) root explants. In Vitro Cell.Dev.Biol.-Plant 53, 209–218 (2017). https://doi.org/10.1007/s11627-017-9800-2
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DOI: https://doi.org/10.1007/s11627-017-9800-2