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In plants, the transpiration stream is the uninterrupted stream of water and solutes which is taken up by the roots and transported via the xylem vessels to the leaves where it evaporates into the air/apoplast-interface of the substomatal cavity. It is driven by capillary action and in some plants by root pressure. The main driving factor is the difference in water potential between the soil and the substomatal cavity caused by transpiration. == Transpiration == Transpiration can be regulated through stomatal closure or opening causing water to move out and evaporate on the leaf, while air flows in. It allows for plants to efficiently transport water up to their highest body organs, regulate the temperature of stem and leaves during heat-generating photosynthesis and it allows for upstream signaling such as the dispersal of an apoplastic alkalinization during local oxidative stress. A very quick summary of this is: #Soil #Roots and Root Hair #Xylem #Leaves #Air 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「transpiration stream」の詳細全文を読む スポンサード リンク
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