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Biol Bull 148: 344-356. (April 1975)
© 1975 Marine Biological Laboratory
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DOSE-RESPONSE EFFECTS OF GAMMA-RADIATION ON SEVERAL GROWTH FUNCTIONS OF CAMPANULARIA FLEXUOSA

JEROME F. WERMUTH 1 and CHARLES D. BARNES 1

1 Department of Life Sciences, Indiana State University, Terre Haute, Indiana 47809

1. Colonies of Campanularia flexuosa were gamma-irradiated with doses ranging from 0 through 80 Krad. Several growth functions were monitored. These growth functions include hydranth production by starters and stolons, upright production by stolons, stolon growth, and longevity of hydranths on both starters and stolons.

2. All growth functions show a decrease with increasing doses of gamma radiation, except hydranth longevity. Hydranth longevity increases with increasing dose.

3. A difference in temperature yields differences in the growth-response curves of these growth functions.

4. The implications of the dose-response curves are discussed in terms of the hypothesis that the primary effect of ionizing radiation is damage to DNA molecules.






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Copyright © 1975 by the Marine Biological Laboratory.