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Related Experiment Videos

An alternative cytokinin biosynthesis pathway.

C Astot1, K Dolezal, A Nordström

  • 1Umeâ Plant Science Center, Department of Forest Genetics and Plant Physiology, The Swedish University of Agricultural Sciences, S-901083 Umeâ, Sweden.

Proceedings of the National Academy of Sciences of the United States of America
|December 13, 2000
PubMed
Summary

Researchers discovered a new pathway for cytokinin synthesis in Arabidopsis plants, independent of the previously known isopentenyltransferase (ipt) pathway. This finding reveals a more complex mechanism for plant hormone production.

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Area of Science:

  • Plant molecular biology
  • Biochemistry
  • Metabolic pathways

Background:

  • Cytokinins are crucial plant hormones regulating growth and development.
  • The isopentenyltransferase (ipt) gene is known to be involved in cytokinin biosynthesis.
  • The exact pathways and precursors for cytokinin synthesis are not fully elucidated.

Purpose of the Study:

  • To investigate the de novo cytokinin biosynthesis pathway in Arabidopsis thaliana.
  • To characterize the role of isopentenyltransferase (ipt) in cytokinin production.
  • To identify alternative cytokinin biosynthetic routes.

Main Methods:

  • In vivo deuterium labeling and mass spectrometry were employed.
  • Double tracer analysis using labeled isopentenyladenosine and deuterium oxide was performed.

Related Experiment Videos

  • Mevastatin, a 3-hydroxy-3-methylglutaryl CoA reductase inhibitor, was used to probe pathway flux.

    • Main Results:

    • Zeatinriboside-5'-monophosphate biosynthesis was significantly higher (66-fold) than isopentenyladenosine-5'-monophosphate (iPMP) in ipt-transformed Arabidopsis.
    • Evidence for an iPMP-independent pathway for zeatin-type cytokinins was found in both transformed and wild-type plants.
    • Mevastatin treatment reduced flux in the alternative pathway, suggesting a terpenoid precursor for the side chain.

    Conclusions:

    • Arabidopsis possesses an alternative, iPMP-independent pathway for zeatin-type cytokinin biosynthesis.
    • The side chain precursor for this alternative pathway appears to be of terpenoid origin.
    • Cytokinin biosynthesis in plants is more complex than previously understood, involving multiple pathways.