Negative Results Following Exposure of Several Kinds of Seeds to Cosmic Rays and Other Radiations at High Altitudes

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Abstract
Seeds of several spp. of Lilium, of white mustard, radish, spring rye, and Golden Bantam sweet corn were sent on flights to altitudes ranging from 30,000 to more than 100,000 ft. in cosmic ray apparatus set up by the Dept. of Physics, U. of Chicago, in 1948 and 1949. Seeds were thus exposed to cosmic rays and other radiations, notably the giant atmospheric nuclei and heavy nuclei, for periods up to 8 hrs. When planted, no plants produced from these seeds showed any obvious phenotypic effects, nor did 2d-generation plants from the white mustard and sweet corn. Thus, under the conditions of these tests neither cosmic rays nor other atmospheric radiations seemed effective in producing cytogenetic effects on these seeds and their seedlings.

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