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PLANT PHYSIOLOGY , Vol 110, Issue 2 413-418, Copyright © 1996 by American Society of Plant Biologists

DEVELOPMENT AND GROWTH REGULATION

Gibberellin Metabolism in Maize (The Stepwise Conversion of Gibberellin A12-Aldehyde to Gibberellin A20

M. Kobayashi, C. R. Spray, B. O. Phinney, P. Gaskin and J. MacMillan
Department of Biology, University of California, Los Angeles, California 90095-1606 (M.K., C.R.S., B.O.P.)

The stepwise metabolism of gibberellin A12-aldehyde (GA12-aldehyde) to GA20 is demonstrated from seedling shoots of maize (Zea mays L.). The labeled substrates [13C,3H]GA12-aldehyde, [13C,3H]GA12, [14C4]GA53, [14C4/2H2]GA44, and [14C4/2H2]GA19 were fed individually to dwarf-5 vegetative shoots. Both [13C,3H]GA12-aldehyde and [13C,3H]GA12 were also added individually to normal shoots. The labeled metabolites were identified by full-scan gas chromatography-mass spectrometry and Kovats retention indices. GA12-aldehyde was metabolized to GA53-aldehyde, GA12, GA53, GA44, and GA19; GA12 was metabolized to 2[beta]-hydroxy-GA12, GA53, 2[beta]-hydroxyGA53, GA44, 2[beta]-hydroxyGA44, and GA19; GA53 was metabolized to GA44, GA19, GA20, and GA1; GA44 was metabolized to GA19; and GA19 was metabolized to GA20. These results, together with previously published data from this laboratory, document the most completely defined gibberellin pathway for the vegetative tissues of higher plants.


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C. M. Wolbang, P. M. Chandler, J. J. Smith, and J. J. Ross
Auxin from the Developing Inflorescence Is Required for the Biosynthesis of Active Gibberellins in Barley Stems
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G. Davis, M. Kobayashi, B. O. Phinney, T. Lange, S. J. Croker, P. Gaskin, and J. MacMillan
Gibberellin Biosynthesis in Maize. Metabolic Studies with GA15, GA24, GA25, GA7, and 2,3-Dehydro-GA9
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Copyright © 1996 by the American Society of Plant Biologists