Gibberellin metabolism in maize. The stepwise conversion of gibberellin A12-aldehyde to gibberellin A20
1996
Kobayashi, M. | Spray, C.R. | Phenney, B.O. | Gaskin, P. | MacMillan, J.
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 2beta-hydroxy-GA12, GA53, 2beta-hydroxyGA53, GA44, 2beta-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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