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Evolution of endogenous hormone concentration in embryogenic cultures of carrot during early expression of somatic embryogenesis

  • Physiology and Biochemistry
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Abstract

Embryogenic callus and suspension cultures of carrot (Daucus carota L., cv. Nantaise), growing on/in medium including 1 mg/l 2,4-dichlorophenoxy acetic acid (2,4-D), were transferred to medium with or without this plant growth regulator, to impair or induce, respectively, further development of somatic embryos. The endogenous hormone levels of the cultures were determined over 7 days by means of radio-immunoassay, to characterize their evolution in the initial stages of embryo development. In general, levels of indoleacetic acid (IAA) and abscisic acid (ABA) showed only short-lived differences among treatments during this time in both types of tissue analyzed (i.e., a peak of IAA in callus cultures in the absence of 2,4-D, 48 h after medium change, and higher ABA contents 144 h after subculture of suspension cultures in the presence of 2,4-D). Gibberellins (1, 3 and 20) were detected only in suspension cultures devoid of 2,4-D, starting 24 h after subculture. Concerning the evaluated cytokinins—zeatin/zeatin riboside and N6(Δ2-isopentenyl) adenine/N6(Δ2-isopentenyl) adenosine—the most remarkable observation is that high levels of the former generally coincided with low concentrations of the latter, indicating a shift from precursor to the active form, and vice versa.

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Acknowledgements

The authors thank the German Academic Exchange Service (DAAD) for financial support in the form of short-term scholarships. The skilled work of A. Azofeifa, E. Tavares and S. Masís, conducting part of the in vitro culture, is gratefully acknowledged.

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Authors and Affiliations

  1. CIGRAS, Universidad de Costa Rica, 2060, San Pedro, Costa Rica

    V. M. Jiménez, E. Guevara & J. Herrera

  2. Institute for Special Crop Cultivation and Crop Physiology (370), University of Hohenheim, 70593, Stuttgart, Germany

    F. Bangerth

Authors
  1. V. M. Jiménez
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  2. E. Guevara
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  3. J. Herrera
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  4. F. Bangerth
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Correspondence to V. M. Jiménez.

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Communicated by D. Dudits

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Jiménez, V.M., Guevara, E., Herrera, J. et al. Evolution of endogenous hormone concentration in embryogenic cultures of carrot during early expression of somatic embryogenesis. Plant Cell Rep 23, 567–572 (2005). https://doi.org/10.1007/s00299-004-0869-9

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  • DOI: https://doi.org/10.1007/s00299-004-0869-9

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