Abstract
Shikimic acid has been shown to be an excellent precursor of 2-hydroxy-1,4-naphthoquinone in Impatiens balsamina L. (Chen and Bohm 1966). Label from shikimic acid-U.L.-C 14 was found exclusively in the quinone portion of the molecule. An excess of unlabeled p-hydroxybenzoic acid administered along with labeled shikimic acid blocked the incorporation of label into 2-hydroxy-1,4-naphthoquinone. This involvement of p-hydroxybenzoic acid is consistent with the observation that it or the corresponding aldehyde is a precursor of quinone rings in microorganisms (Rydney and Parson 1963; Gibson and Cox 1964; Whistance et al. 1966) and in Euglena gracilis (Powls and Hemming 1966). This present communication records the observation that p-hydroxybenzaldehyde-U.L.-C 14 and p-hydroxybenzoic acid-U.L.-C 14 serve as precursors of 2-hydroxy-1,4-naphthoquinone in aerial portions of Impatiens balsamina L. This is the first report of such involvement in a vascular plant.
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