茶葉の化学成分含量に及ぼす光の影響

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タイトル別名
  • Effect of Light on Chemical Constituents in the Tea Leaves
  • チャバ ノ カガク セイブン ガンリョウ ニ オヨボス ヒカリ ノ エイキョウ

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説明

Effect of shading culture on the quantity of chemical constituents in the tea leaves was investigated.<br> During the developing period of the tea shoots, the tea plants were covered with several sheets of black net for 13_??_25 days. The shoots were plucked at every 3_??_5 days, and its chemical constituents were analyzed.<br> Analysis showed that the total nitrogen content of the shaded shoots incresed, but that of the unshaded shoots slightly decreased in the early stage of the experiment thereafter it decreased. The total amino acids content and the caffeine content were in similar tendency, too. The theanine content of the shaded shoots increased early and decreased gradually, while that of the unshaded shoots decreased rapidly. The aspartic acid content of the unshaded shoots decreased, while that of the shaded shoots did not change. The tannin content of the shaded and the unshaded shoots decreased, but the decrease in former was larger. The (-)-epicatechin content and the (-)-epigallocatechin content of the shaded shoots did not change, but those of the unshaded shoots increased gradually. The free reducing sugar content showed similar tendency, too.

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