on the Fate of Tyrosine in Tobacco Callus Tissue II. The Lack of Incorporation Into Lignin

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Abstract
The presence of lignin in an insoluble fraction obtained from tobacco callus tissue was shown by the production of vanillin and syringaldehyde on oxidation of the material with nitrobenzene in alkali. Tyrosine was not rapidly incorporated into the coniferyl and syringyl residues of the lignin. The specific activity of the p-hydroxybenzalde-hyde recovered was higher than that of the bound tyrosine in the material, indicating that a second source of the aldehyde is present. Tyrosine is rapidly incorporated into this second source of p-hydroxybenzaldehyde.