Effect of Indoleacetic Acid on Root Growth of X-Irradiated Peas

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Abstract
Idaho White peas (Pisum sativum) were treated with different dosages of X-irradiation (34 kv. and 22-24 ma.), and the inhibiting effect upon growth was studied. Imbibed, irradiated peas responded to indoleacetic acid (IAA) which was applied in an attempt to counteract the inhibition of growth caused by X-irradiation. The optimal concn. of added IAA for the root growth from imbibed peas irradiated at 3,000 r lay between 10-8 and 10-9 [image]. When intact and decapitated seedlings, irradiated at 500 r, were treated with 10-9 [image] IAA in nutrient soln. and with 0.2% IAA in lanolin paste, respectively, a partial reduction in the amt. of inhibition of growth was obtained. Irrespective of irradiation, the development of the axillary bud in decapitated seedlings was promoted in the absence and inhibited in the presence of IAA whereas the initiation and development of lateral roots in intact and decapitated plants were accelerated when IAA was present.