Abstract
Experiments were carried out in the purpose of finding a method of testing the cold resistance in tea plant varieties by measuring the permeability of the cell. 1. The higher the resistance of the variety to cold, the more permeable were the leaf cells for water and solutes, the deplasmolysis taking place in shorter periods. 2. It was a simple method for judging degree of cold resistance of the variety to observe the deplasmolysis phenomena in the leaf tissues treated with plasmolysing solutions, comparing it with those in the Yabukita variety as a standard. 3, The deplasmolysis time was shorter in the triploid plants which showed higher resistance to cold, the osmotic pressure of its cells being lower than that of the diploids. The method was recognized to be highly available for estimating the strength of cold resistance of tea plant varieties.
