Absence of detectable fractionation effects in Tradescantia somatic mutations for an X-ray dose of 5 rad
Two experiments have been performed to determine directly and with statistical accuracy the presence or absence of detectable fractionation effects for pink somatic mutations in Tradescantia stamen hairs. The experiments were done at X-ray doses low enough to fall along the strongly linear segment of the linear-quadratic dose-response curve. From previous work it was known that pink mutation frequency is about 34% less if exposed to a 35 + 35-rad dose. This dose falls along the strongly quadratic segment of the dose-response curve. In the present experiments, involving over 836,000 stamen hairs, the mutation frequency resulting from 2.5 + 2.5 rad of X rays with 5 hr between doses was the same as that resulting from an acute dose of 5 rad. It is suggested that fractionation effects may not occur in somatic mutations at still much lower X-ray dose levels.
- Research Organization:
- Univ. of Missouri, Columbia
- OSTI ID:
- 5973304
- Journal Information:
- Radiat. Res.; (United States), Vol. 101:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SOMATIC MUTATIONS
RADIOINDUCTION
TRADESCANTIA
FRACTIONATED IRRADIATION
LOW DOSE IRRADIATION
BIOLOGICAL REPAIR
DOSE-RESPONSE RELATIONSHIPS
EXPERIMENTAL DATA
STAMEN
X RADIATION
BIOLOGICAL RECOVERY
DATA
ELECTROMAGNETIC RADIATION
FLOWERS
INFORMATION
IONIZING RADIATIONS
IRRADIATION
MUTATIONS
NUMERICAL DATA
PLANTS
RADIATIONS
RECOVERY
REPAIR
560141* - Radiation Effects on Plants- Basic Studies- (-1987)