Abstract
Summary Potassium, as KCl or KNO3, enhanced amaranthin and chlorophyll production in seedlings of Amaranthus caudatus. Potassium chloride and KN03 induced a different response in the relative levels of amaranthin synthesised in seedlings given a light treatment and those kept completely in the dark. Kinetin in combination with KCl (and to a lesser extent with KN03) induced a relatively large amaranthin content in dark-grown seedlings. The results indicate that KCl and KN03 stimulate amaranthin formation by increasing active pool tyrosine (and DOPA). This was confirmed by the specific radioactivity of amaranthin purified from «salt» treated seedlings incubated with 14C-tyrosine.
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