On the Adsorption of Dye in the Tissue of the Tea Plant

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This investigations were made on the varietal difference of cold resistance of the tea plant, using the method of dye adsorption test to compare the content of hydrophilic colloids in the cells. The results were summarized as follows.<BR>1. The facts that the older plants with-stood cold better than the younger ones, that leaves were more injured by cold than branches and that cold resistance increased up to the coldest season were proved by dye adsorption test. The degree of dye adsorption was greater in the stronger variety.<BR>2. The adsorptive action varied by kinds of dyes, i. e. basic dyes were adsorbed well by stronger variety and the results of acidic dyes were diametrically opposed. Malachite green and eosin were suitable dyes for this test.<BR>3. In general, the test of dried tissues agreed with those of fresh condition, but the fresh leaves from older plants were the best samples for this test.
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