Biosynthesis abscisic aldehyde

The final fate of C-20, which is lost during the biosynthesis of the C19 gibberellin lactones, is as carbon dioxide. Gibberellin A13 aldehyde may be an intermediate in gibberellin biosynthesis prior to this step. The conversion of gibberellin A9 into gibberellin A20 in excised lettuce hypocotyls has been observed. " Gibberellins Ag, Aie, and A24 and abscisic acid have been detected by g.c.-m.s. in rye. 

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