Abstract
beta-Hydroxyethylhydrazine forces flowering of pineapple plants, possibly by reducing auxin concentration. A specific and sensitive assay showed that beta-hydroxyethylhydrazine (3.3 x 10(-7)M) inhibits noncompetitively and almost completely the oxidation of tryptamine to indoleacetaldehyde by extracts of pea-seedling (Pisum sativum L. var. Alaska). The relative rate of oxidation of putrescine to Delta(1)-pyrroline compared to that of tryptamine by these extracts and the inhibition of both reactions by beta-hydroxyethylhydrazine suggest that diamine oxidase is inhibited. beta-Hydroxyethylhydrazine is a potent inhibitor in vivo of animal diamine oxidase.
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