Abstract
Understanding the fate and dynamics of cells during callus formation is essential to understanding totipotency and the somatic embryogenesis (SE) mechanisms. In the present study, the histodifferentiation events involved during the acquisition and development of somatic embryogenesis in oil palm (Elaeis guineensis Jacq.) was investigated. Zygotic embryos were inoculated on SE induction medium, and at 14 days the first divisions of the procambial and perivascular cells were observed. This region progressed to the formation of meristematic masses at 21 days, indicating their procambial and perivascular origin. Primary calli emerged at 45 days of culture, followed by progression to embryogenic calli at 90 days. The formation of proembryos (PE) from the meristematic cells occurred at 135 days of cultivation. The PE were isolated from the tissue of origin by the slight thickening of the cell wall, indicating their unicellular origin. When transferred to the maturation phase, differentiation of the somatic embryos at different developmental stages (globular and torpedo) was observed. The differentiated somatic embryos presented protoderm, procambial strands and plumules. Afterwards, they were transferred to culture medium without growth regulators in which conversion of the somatic embryos from torpedo stage into plants was observed. These results enable a greater understanding of the SE process and plantlet formation in E. guineensis.
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This work was supported by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), and Financiadora de Estudos e Projetos (FINEP), Brazil.
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de Carvalho Silva, R., Luis, Z.G. & Scherwinski-Pereira, J.E. The histodifferentiation events involved during the acquisition and development of somatic embryogenesis in oil palm (Elaeis guineensis Jacq.). Plant Growth Regul 72, 67–80 (2014). https://doi.org/10.1007/s10725-013-9837-0
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DOI: https://doi.org/10.1007/s10725-013-9837-0