Absorption and Metabolism of Tritium Oxide and Tritium Gas by Bean Plants

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Abstract
A study was made of the uptake and incorporation of the radioactive isotope of H2, tritium, by bean plants grown in nutrient soln. containing tritium oxide. Tritium concn. of plant water reached 45 to 65% of those in the nutrient soln. Slightly higher % of tritium in the plant water and as incorporated tritium were obtained with lower pH values. Approx. 5 times more tritium was fixed in the tissues grown in light than those grown in total darkness. The factor for plant water was approx. 2.5. The leaf exposures to tritium gas constitute little more than an introduction to the problem of H2 fixation by plants.

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