Abstract

With x-ray-microbeam irradiation of single pine pollen grains, tube growth stimulation could be achieved corresponding to the results obtained after uv-microbeam irradiation. These effects depend upon the dose, the dose rate, and the conditions of the pollen during irradiation. Assuming a linear superposition of the radiation effects of the two nuclei and of the cytoplasm, the total radiation effect was calculated. The stimulation effect was localized in the cytoplasm and in the generative nucleus, while the vegetative nucleus caused mostly tube growth inhibitions.

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