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Plant Physiology 58:387-392 (1976)
© 1976 American Society of Plant Biologists

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Articles

Metabolism of [3H]Gibberellin A20 in Light- and Dark-grown Tobacco Callus Cultures 1

Barbara Lance, Richard C. Durley2, David M. Reid, Trevor A. Thorpe and Richard P. Pharis

a Department of Biology, University of Calgary, Calgary, Alberta, Canada T2N 1N4

The growth of tobacco callus in culture (previously shown to contain gibberellin [GA]-like substances), and its ability to metabolize [3H]-GA20 were examined. Growth rates, in the presence and absence of exogenously applied GA, were examined in light and dark conditions. Dark-grown callus grew at a much faster rate than light-grown and [3H]GA20 was metabolized much more rapidly in darkness than in light.

[3H]GA1 was identified by combined gas-liquid chromatography/mass spectrometry as a major product of [3H]GA20, and was found to be a more potent promoter of tobacco callus growth than GA20.

2 Present address: Department of Crop Science, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N:0W0.

1 Supported by National Research Council of Canada Grants A-5727 to D. M. R., A-6467 to T. A. T., and A-2585 to R. P. P.






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Copyright © 1976 by the American Society of Plant Biologists