Experimental evidence clearly establishes that exposure levels from natural terrestrial radiation can be of potential genetic and ecological importance to highly radiosensitive plant populations. Other facets of the physical environment are capable of strong synergistic interactions, or attenuation of the radiation responses to the point of near cancellation. Changes in the rate of development, inherent with age or developmental stage or induced by the environment, can also influence the intensity of the radiation response and the degree to which an organism can discriminate between radiation levels. For plant populations indigenous to regions of high radioactivity, dosages may be materially altered by meteorological conditions, developmental rates and the absorption of radionuclides by the plant roots.
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