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Three-week old Commelina communis was transferred and grown in Hoagland solution containing zeatin for 7 days, and then a number of physiological activities were investigated. In control, the length of the stem of plants was increased to 4.7cm, but in zeatin treatments, the growth of plants were increased to 1.5cm, 2.1cm, 3.9cm and 4.3 em, respectively. In the treatments of zeatin, total chlorophyll contents were reduced to , respectively, on the contrast to the control. In chlorophyll fluorescence experiments, Fv/Fm ratios were also reduced to in the light intensity of zeatin treatments on the contrast to the control. Water stresses were increased to 2.6, 1.7 and 1.2 times by zeatin. On the other hand, combination of zeatin reduced water stress to . In accumulation experiments transports were inhibited to zeatin. Therefore, it could be concluded that zeatin clearly reduced the toxicities of by reducing the absorption of .
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