Abstract
Tazawa and Okazaki (1997) measured transpiration of water from the radish hypocotyl segment by measuring a decrease in the weight and reported that transpiration of water occurred linearly with time. However, it seems to be curious, because transpiration of water should increase the concentration of the cell sap and this should decrease the transpiration rate. Thus, transpiration of water from the Chara internodal cell and evaporation of water from distilled water, 300 mM mannitol, 500 mM mannitol and 278 mM KCl solutions were measured at 25 C under controlled relative humidities. The results showed that transpiration of water from the cell and evaporation from the solutions were linear with time and the evaporation rates from distilled water, 300 mM mannitol, 500 mM mannitol and 278 mM KCl solutions were almost equal to each other.
