DOSE AND DOSE RATE EFFECTS OF X-IRRADIATION ON PLANTS WITH VARYING CHROMOSOME NUMBERS
Gordon M. Clark, D. G. Baker, John A. Heddle
Abstract
Gordon M. Clark, D. G. Baker, John A. Heddle
Abstract
With 4 day germination as the criterion of radiation effect, diploid buckwheat seeds showed practically no variation with doses of x radiation up to 55 Kr; tetraploid seeds showed a trend toward decreasing germination with increasing dose. The diploid seeds showed a greater dose rate effect. Using the numbers of plants surviving 40 days as the criterion of radiation injury, both the 2n and 4n plants showed a decreased survival with increasing dose. The 4n seeds however had a greatly increased tolerance to radiation injury. (auth)
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With 4 day germination as the criterion of radiation effect, diploid buckwheat seeds showed practically no variation with doses of x radiation up to 55 Kr; tetraploid seeds showed a trend toward decreasing germination with increasing dose. The diploid seeds showed a greater dose rate effect. Using the numbers of plants surviving 40 days as the criterion of radiation injury, both the 2n and 4n plants showed a decreased survival with increasing dose. The 4n seeds however had a greatly increased tolerance to radiation injury. (auth)
Key concepts: Germination, Ploidy, Biology, Radiation dose, Lethal dose, Dose rate, Irradiation, Chromosome