Role and function of cytokinin oxidase in plants

Robert J. Jones, Beth M.N. Schreiber

Research output: Contribution to journalReview article

Abstract

Cytokinin oxidase (CK oxidase) is widely distributed in plants and is the only enzyme that has been shown unequivocally to catalyze the catabolism of specific cytokinins (CKs) to inactive products that lack the N6-unsaturated side chain. Thus, the enzyme is thought to play a major role in controlling the level or species of CKs in plant tissues. However, despite its discovery more than 25 years ago, little attention has been given to the elucidation of its role and function in plant growth and development. This review seeks to bring in to context the current state of knowledge regarding the biochemical and molecular properties, regulation in undifferentiated and differentiated tissues, and recent results from studies using transgenic plants in an attempt to provide a more comprehensive understanding of the physiological significance of the enzyme in plants. Notwithstanding species, tissue and other differences, in general, CK oxidase appears to contribute to CK homeostasis in plants. However, complete clarity as to its function awaits purification of the protein to homogeneity and the ultimate development of requisite molecular probes.

Original languageEnglish (US)
Pages (from-to)123-134
Number of pages12
JournalPlant Growth Regulation
Volume23
Issue number1-2
DOIs
StatePublished - 1997
Externally publishedYes

Keywords

  • Catabolism
  • Cytokinin oxidase
  • Cytokinins
  • Function
  • Regulation
  • Role

ASJC Scopus subject areas

  • Physiology
  • Agronomy and Crop Science
  • Plant Science

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