Water Movement into and throughTradescantia virginiana(L.) Leaves

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Abstract
Water uptake into the ventral epidermis and the other tissues of excised T. virginiana leaves was measured separately and simultaneously when the uptake rates were steady. It was found that uptake into the ventral epidermis was proportionately greater, compared with uptake into the remainder of a leaf, than would be expected from the ratio of conductances of the two pathways. This result led to the conclusion that not only is the epidermis a pathway for water transport in the transpiration stream but that it is an important site of evaporation for stomatal transpiration.

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