biologia plantarum

International journal on Plant Life established by Bohumil Nìmec in 1959

Biologia plantarum 39:53-66, 1997 | DOI: 10.1023/A:1000304922507

Regeneration of roots, shoots and embryos: physiological, biochemical and molecular aspects

G.-J. De Klerk1, B. Arnholdt-Schmitt2, R. Lieberei3, K.-H. Neumann2
1 Centre for Plant Tissue Culture Research, Lisse, the Netherlands
2 Institute of Plant Nutrition, Justus-Liebig University, Giessen, Germany
3 Institute of Applied Botany, University of Hamburg, Hamburg, Germany

When the proper stimuli are given, somatic plant cells may form adventitious embryos, roots or shoots. The three pathways of regeneration show apparent similarities. They consist of three analogous phases: 1) dedifferentiation (during which the tissue becomes competent to respond to the organogenic/embryogenic stimulus), 2) induction (during which cells become determined to form either a root, a shoot or an embryo), and 3) realization (outgrowth to an organ or an embryo). The first phase may involve a period of callus growth (indirect regeneration), but often cells present in the explant become competent without cell division or without cell division at a large scale (direct regeneration). In an explant, only very few cells show the organogenic/embryogenic response. In direct regeneration, the three regenerative pathways start from cells in different tissues. This is most obvious when the different types of regeneration occur in the same explant. The hormonal trigger for the dedifferentiation phase is a general one, probably auxin. During the induction phase, each pathway requires specific hormonal triggers. During the realization phase, hormones should be absent or at low concentration. The successive steps in the regeneration process coincide with events on the molecular and biochemical levels, but so far no coherent picture has emerged. In particular during the early stages of regeneration, research on these levels is hampered by a technical problem, viz., the very low proportion of cells that participate in the process of regeneration. New methods may overcome this problem.

Keywords: biotechnology; callus; micropropagation; plant hormones; tissue culture

Prepublished online: January 1, 1997; Published: July 1, 1997  Show citation

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De Klerk, G.-J., Arnholdt-Schmitt, B., Lieberei, R., & Neumann, K.-H. (1997). Regeneration of roots, shoots and embryos: physiological, biochemical and molecular aspects. Biologia plantarum39(1), 53-66. doi: 10.1023/A:1000304922507
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