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Planta

, Volume 223, Issue 4, pp 637–645 | Cite as

Abscisic acid and stress treatment are essential for the acquisition of embryogenic competence by carrot somatic cells

  • Akira Kikuchi
  • Nobuya Sanuki
  • Katsumi Higashi
  • Tomokazu Koshiba
  • Hiroshi Kamada
Original Article

Abstract

Studies of carrot embryogenesis have suggested that abscisic acid (ABA) is involved in somatic embryogenesis. A relationship between endogenous ABA and the induction of somatic embryogenesis was demonstrated using stress-induced system of somatic embryos. The embryonic-specific genes C-ABI3 and embryogenic cell proteins (ECPs) were expressed during stress treatment prior to the formation of somatic embryos. The stress-induction system for embryogenesis was clearly distinguished by two phases: the acquisition of embryogenic competence and the formation of a somatic embryo. Somatic embryo formation was inhibited by the application of fluridone (especially at 10−4 M), a potent inhibitor of ABA biosynthesis, during stress treatment. The inhibitory effect of fluridone was nullified by the simultaneous application of fluridone and ABA. The level of endogenous ABA increased transiently during stress. However, somatic embryogenesis was not significantly induced by the application of only ABA to the endogenous level, in the absence of stress. These results suggest that the induction of somatic embryogenesis, in particular the acquisition of embryogenic competence, is caused not only by the presence of ABA but also by physiological responses that are directly controlled by stresses.

Keywords

Somatic embryogenesis Carrot (Daucus carotaStress Abscisic acid 

Abbreviations

ABA

Abscisic acid

2,4-D

2,4-dichlorophenoxyacetic acid

EC

Embryogenic cells

ECP

Embryogenic cell protein

GC-SIM-MS

Gas chromatography-selected ion monitoring-mass spectrometry

IAA

Indole acetic acid

NC

Non-embryogenic cells

Notes

Acknowledgements

This work was supported, in part, by grant-in-aids from the Research for the Future Program of the Japan Society for the Promotion of Science (JSPS-RFTF00L01601) and the Ministry of Education, Sports, Science, and Technology, Japan.

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Akira Kikuchi
    • 1
  • Nobuya Sanuki
    • 2
  • Katsumi Higashi
    • 3
  • Tomokazu Koshiba
    • 2
  • Hiroshi Kamada
    • 1
  1. 1.Graduate School of Life and Environmental SciencesUniversity of TsukubaTsukubaJapan
  2. 2.Department of Biological SciencesTokyo Metropolitan UniversityHachiojiTokyoJapan
  3. 3.Department of Biosciences, Faculty of Science and EngineeringTeikyo University of Science and TechnologyUenoharaYamanashiJapan

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