On the Nature of Growth Stimulation ofVicia FabaRoots during Irradiation at Low Dose-rates

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Abstract
Primary roots of Vicia faba were irradiated at dose-rates of 1·3 and 7 rads per hour in the presence and absence of 2 × 10−5 grammes per litre of the synthetic auxin, alpha-naphthalene acetic acid. The temporary stimulation of root growth observed during irradiation at 1·3 rads per hour was completely eliminated when the synthetic auxin was present. The results tend to support the contention that the temporary stimulation is a consequence of a disturbance in the auxin economy in the root.