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Transmembrane ferricyanide reduction in tobacco callus cells

Journal of Plant Growth Regulation, ISSN: 1435-8107, Vol: 2, Issue: 1, Page: 243-249
1983
  • 22
    Citations
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    Usage
  • 2
    Captures
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Metrics Details

  • Citations
    22
    • Citation Indexes
      22
  • Captures
    2

Article Description

Transmembrane ferricyanide reduction in whole cells of normal and of transformed tobacco (Nicotiana tabacum) callus tissue was compared. It was found that low concentrations of indoleacetic acid (IAA, 0.1 μM), gibberellic acid (GA, 0.3 μM), and benzyl adenine (BA, 0.03 μM) stimulate external ferricyanide reduction in normal tobacco callus cells, but inhibit this reaction up to 67% in transformed cells when hormones are applied to cells 10 min prior to assay. Higher concentrations of these growth regulators (1 μM or greater) inhibit transmembrane ferricyanide reduction in both types of cells, with the exception of IAA, giving an initial stimulation of the rate (12%), followed by 24% inhibition after 2 min. The observed external ferricyanide reduction by whole tobacco callus cells may be explained on the basis of a transplasmalemma redox system, which may be associated with the iron metabolism of these cells. © 1984 Springer-Verlag.

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