RESEARCH PROJECT ON THE MEASUREMENT OF MUTATION RATES INDUCED BY DIFFERENT MUTAGENIC RADIATIONS AT WIDELY DIFFERENT INTENSITIES. Final Report
Technical Report
·
OSTI ID:4132943
An apparent dose rate effect showing chronic gamma irradiation (0.426 rads/min) to be six times more effective than acute irradiation (360 rads/min) was demonstrated using three marker genes in tomato. Mutation frequencies were chronic irradiation 231.6 x 10/sup -8//rad/locus and acute irradiation 40.5 x 10/ sup -8//rad/locus. This enhancement of the mutation frequency, was shown to be directly related to the radiation sensitivity of the pollen. Increased sensitivity results in an increase of zygotic lethals (reduced seed set per fruit) and of mutation of the marker genes. Most of the mutation of the marker genes are chromosome deletions. The increased sensitivity of the pollen is not associated with the reduced dose rate of the chronic irradiation, but is due to the storage conditions during the extended time of irradiation. Both desiccation and aging increase the sensitivity of the pollen and result in increased mutation frequency. (auth)
- Research Organization:
- Australia. Commonwealth Scientific and Industrial Research Organization, Melbourne
- NSA Number:
- NSA-18-008111
- OSTI ID:
- 4132943
- Report Number(s):
- TID-19942
- Country of Publication:
- United States
- Language:
- English
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