Effect of shade treatment on biosynthesis of catechins in tea plants

概要

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When tea plants were shaded with black lawn cloth for several days in the field, the accumulations of (-)-epicatechin, (-)-epicatechin-3-gallate, (-)-epigallocatechin and (-)-epigallocatechin-3-gallate decreased in newly developing tea shoots. Radioactive tracer studies showed that the conversions of glucose-U-^<14>C, shikimic acid-G-^<14>C and phenylalanine-U-^<14>C into (-)-epicatechin and (-)-epigallocatechin moieties were depressed by the shade treatment for tea plants but the incorporation of trans-cinnamic acid-3-^<14>C was not affected. The treatment was found to have no significant effect on the activities of phospho-2-keto-3-deoxy-heptonate aldolase (EC. 4.1.2.15), 3-dehydroquinate synthase (EC. 4.6.1.3), 3-dehydroquinate dehydratase (EC. 4.2.1.10), shikimate dehydrogenase (EC. 1.1.1.25) and trans-cinnamate 4-monooxygenase (EC. 1.14.13.11) in the shoots, whereas the activity of phenylalanine ammonia-lyase (EC. 4.3. 1.5) clearly decreased.
日本植物生理学会の論文