The Effect of Ionizing Radiations on the Broad Bean Root, Part X

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Abstract
The growth rate of the broad bean root (Vicia faba) decreases with increasing dose of X-rays. The concn. of O2 during irradiation acts as a simple multiplying factor on the dose. The multiplying factors give a sigmoid curve when plotted against the 02 concn., reaching a max. value of 3 in the range of 15-20 cc.\ of O2/l. of water. The 02 concn. in the root is considerably less than in the water. The presence of dissolved 62 in the water in which the roots are irradiated increases the degree to which X-rays inhibit mitosis and produce abnormal mitoses.