Assessment of radiation impact on <Emphasis Type="Italic">Stellaria graminea</Emphasis> cenopopulations in the zone of the Eastern Ural Radioactive Trace |
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Authors: | V N Pozolotina E V Antonova E M Karimullina |
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Institution: | 1.Institute of Plant and Animal Ecology, Ural Division,Russian Academy of Sciences,Yekaterinburg,Russia |
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Abstract: | The seed progeny of the little starwort (Stellaria graminea) growing in the zone of the Eastern Ural Radioactive Trace (EURT) and in background areas was studied. The radiation exposure
of this species in the EURT zone was three orders of magnitude higher than in the background. Evidence was obtained for high
interannual variation in seed viability and tolerance to additional acute irradiation, but no specific connection was revealed
between these parameters and radioactive contamination level in plant habitats. Weather conditions are an important source
of variation in seed viability, but significant influence of temperature and precipitation was revealed only for cenopopulations
of the EURT. The proportion of seedlings with morphoses in samples from the EURT was found to be increased; additional irradiation
facilitated the detection of latent abnormalities. A negative correlation between seedling survival rate and the content of
low-molecular antioxidants in the seedlings was revealed in all test areas. The allozyme structure of starwort cenopopulation
was analyzed for the first time. A directed switch of allele frequencies at loci Pgi-2 and Fdh was revealed in samples from
the EURT. |
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