The Radiosensitivity of Seeds of Different Ontogenetic Development: I. The Effects of X-Irradiation on Oat Seeds of Different Phases of Ontogenetic Development

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Abstract
The radiation sensitivity of oat seed varies with the ontogenetic phase of development. The younger ontogenetic stages are more radiosensitive than the older ones. Irradiation not only affected the embryo and its basic structures which were already formed, but inhibited development of those structures which were formed after the seeds had sprouted. The most marked effect of the irradiation was in a reduction of the number of primary roots. Also, the general effect was more apparent on the root system than on the stalk. Plants developing from irradiated seeds show effects which are related to the amount of irradiation given to the seeds. In addition to the harmful effects noted after higher doses, there appears to be some slight enhancement of growth after small amounts of radiation exposure.

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