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Abscisic aldehyde is an intermediate in the biosynthesis of the plant hormone abscisic acid. It is produced by the dehydrodgenation of xanthoxin by xanthtoxin dehydrogenases, which is an NAD+ dependent short-chain dehydrogenas, followed by selective oxidation by abscisic aldehyde oxygenase.
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Abscisic aldehyde Wikipedia(Text) CC BY-SA