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Plant and Cell Physiology, 1980, Vol. 21, No. 6 989-998
© 1980

Article

Effect of shade treatment on biosynthesis of catechins in tea plants

Ryoyasu Saijo

National Research Institute of Tea, Kanaya-cho Haibara-gun, Shizuoka 428, Japan

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-14C, shikimic acid-G-14C and phenylalanine-U-14C into (—)-epicatechin and (—)-epigallocatechin moieties were depressed by the shade treatment for tea plants but the incorporation of trans-cinnamic acid-3-14C 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 [EC] ), 3-dehydroquinate synthase (EC. 4.6.1.3 [EC] ), 3-dehydroquinate dehydratase (EC. 4.2.1.10 [EC] ), shikimate dehydrogenase (EC. 1.1.1.25 [EC] ) and trans-cinnamate 4-monooxygenase (EC. 1.14.13.11 [EC] ) in the shoots, whereas the activity of phenylalanine ammonia-lyase (EC. 4.3.1.5 [EC] ) clearly decreased.

(Received March 17, 1980; )
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