Abstract
1. Idaho White peas (Pisum sativum L.) were treated with different dosages of X-irradiation (34 kv. and 22-24 ma.), and the inhibiting effect upon growth was studied. 2. Imbibed, irradiated peas responded to IAA which was applied in an attempt to counteract the inhibition of root growth caused by X-irradiation. The optimal concentration of added IAA for the root growth of peas irradiated at 3000 r lay between 10-8 and 10-9 M. 3. A partial reduction in the amount of inhibition of growth was obtained when intact and decapitated seedlings, irradiated at 500 r, were treated with 10-9 M IAA and with 0.2% IAA in lanolin paste, respectively. 4. The development of the axillary bud in decapitated seedlings, irrespective of irradiation, was promoted in the absence, and inhibited in the presence, of IAA. 5. The initiation and development of lateral roots was accelerated by IAA, regardless of irradiation.
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