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In situ monitoring with Tradescantia around nuclear power plants
Abstract:
Highly sensitive mutational responses of the stamen-hair system of some Tradescantia clones heterozygous for flower color (blue/pink, the blue being dominant) to low-level radiation and chemical mutagens, as demonstrated in the last decade, seem to endorse this system to be the most promising biological tester for detecting the genetic effects of mutagens at low levels. Two triploid (thus sterile) clones, KU 7 and KU 9, have been established as those suitable for in situ monitoring of environmental mutagens. In situ monitoring with such Tradescantia clones was first tried in 1974 around a nuclear power plant in Japan, then has been repeated until 1979 around more nuclear plants. About 260,000 to 1,570,000 stamen hairs were observed per year per nuclear plant (about 12-million hairs in total), and the data of pink mutation frequency were analyzed statistically. Significantly increased mutation frequencies were observed and were correlated to the operation periods of the nuclear facilities and to predominant wind direction, but not to other environmental factors. Considering physical monitoring data of radiation dose in the air, internal exposure due to incorporation and concentration of man-made radioactive nuclides seems to be of a greater importance in increasing mutation incidence.
Insights
Tradescantia stamen-hair bioassays effectively detect low-level radiation and chemical mutagens. Environmental monitoring around nuclear plants showed increased mutation frequencies linked to plant operations and wind direction.
Area of Science:
- Environmental Science
- Genetics
- Radiation Biology
Background:
- The Tradescantia stamen-hair system exhibits high sensitivity to low-level radiation and chemical mutagens.
- This bioassay is considered a promising tool for detecting genetic effects of environmental mutagens.
Purpose of the Study:
- To assess the utility of Tradescantia clones (KU 7 and KU 9) for in situ monitoring of environmental mutagens.
- To investigate mutation frequencies around nuclear power plants and correlate them with operational periods and environmental factors.
Main Methods:
- Utilized two triploid Tradescantia clones (KU 7 and KU 9) for in situ monitoring.
- Observed approximately 12 million stamen hairs between 1974 and 1979 around nuclear facilities.
- Statistically analyzed pink mutation frequency data in relation to nuclear plant operations and environmental conditions.
Main Results:
- Significantly increased mutation frequencies were observed in Tradescantia stamen hairs.
- Mutation frequencies correlated with nuclear facility operation periods and predominant wind direction.
- Internal exposure from man-made radioactive nuclides appeared more significant than external radiation dose in increasing mutation incidence.
Conclusions:
- Tradescantia stamen-hair bioassays are effective for in situ environmental mutagen monitoring.
- Nuclear power plant operations can lead to detectable increases in genetic mutations.
- Internal incorporation of radioactive nuclides is a key factor in radiation-induced mutations.