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Plant Physiology 57:699-703 (1976)
© 1976 American Society of Plant Biologists

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Articles

Effects of Light, Abscisic Acid, and 6N-Benzyladenine on the Metabolism of [3H]Gibberellin A4 in Seeds and Seedlings of Lettuce, cv. Grand Rapids 1

Richard C. Durley2, J. Derek Bewley3, Ian D. Railton4 and Richard P. Pharis

a Department of Biology, University of Calgary, Calgary, Alberta T2N IN4, Canada

Gibberellin A4 (GA4) can substitute for light in the germination of Grand Rapids lettuce seeds. Seeds imbibed in [3H]GA4 do not convert this to other GAs prior to, or immediately following, visible germination: thus GA4 alone can promote radicle expansion. Abscisic acid inhibited [3H]GA4-induced germination, but did not significantly affect [3H]GA4 uptake or metabolism during germination. 6N-benzyladenine overcame the inhibitory effect of abscisic acid and increased [3H]GA4 uptake, although radicle emergence was delayed somewhat.

During hypocotyl extension there was a large conversion of [3H]GA4 to [3H]GA1 in light or darkness, the major conversion site being the growing root. Hypocotyls of dark-grown seedlings contained more [3H]GA1 than those of light-grown seedlings. The apparent inability of exogenous GA1 to promote greater hypocotyl extension than GA4 is related to its poorer uptake. Abacisic acid markedly inhibited hypocotyl expansion, root growth, and the conversion of [3H]GA4 to [3H]GA1.

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

3 To whom requests for reprints should be addressed.

4 Present address: Botany Department, Rhodes University, Grahamstown, P.O. Box 94, South Africa.

1 This work was supported by National Research Council of Canada Grants A-6352 to J. D. B. and A-2585 to R. P. P. and by a NATO-Science Research Council (London, U.K.) postdoctoral fellowship to I. D. R.






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Copyright © 1976 by the American Society of Plant Biologists