Abstract
The plant growth inhibitor xanthoxin which can be prepared in vitro by the oxidation of certain xanthophylls has been identified in the ether extracts of the shoots of a wide variety of higher plants. Gas liquid chromatography of an acetylated derivative has been used for its quantitative estimation.Evidence is provided that xanthoxin is a true endogenous inhibitor and that violaxanthin or a related xanthophyll epoxide is its biogenetic precursor. The importance of xanthoxin and its relationship with abscisic acid and other plant growth inhibitors is discussed.
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