Movement of Tritiated Water in the Root System of Helianthus annuus in the Presence and Absence of Transpiration

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Abstract
In a controlled-environment chamber at 20[degree] the movement of tritiated water was followed in 2-4-week-old root systems of plants grown in nutrient solution containing tritiated water (THO). Tritium did not uniformly enter entire root systems detached at the cotyledonary node and exposed to THO for varying periods. Influx of THO was most rapid in the middle segments of the root system, and about equally slow in the apical and basal root segments. The pattern of tritium flux into entire root systems attached to the shoot in the dark was similar to flux into detached root systems. In the light, however, entire root systems attached to the shoot took up THO at mcuh slower rates.