Effect of Purine and Pyrimidine Analogues on Growth and RNA Metabolism in the Soybean Hypocotyl-the Selective Action of 5-Fluorouracil

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Abstract
The active turnover of chlorogenic acid (3-caffeoylquinic acid3), a major phenolic component of Xanthium leaves and potato tuber disks, has been demonstrated in these tissues. Pulse-labelling experiments with radioactive l-phenylalanine and trans-cinnamic acid as well as direct feeding experiments with chlorogenic acid-14C labelled in the caffeoyl moiety have been employed in the turnover studies. The rate of turnover is calculated to be on the order of 50 to 100 mμmoles per hour per gram fresh weight of tissue.