Comparison of remote consequences in Taraxacum officinale seed progeny collected in radioactively or chemically contaminated areas.
We carried out a comparative study of seed progeny taken from the dandelion (Taraxacum officinale s.l.) coenopopulations exposed for a long time to radioactive or chemical contamination originated from the East-Ural radioactive trace zone (EURT) or Nizhniy Tagil metallurgical combine impact zone (NTMC), respectively. Coenopopulations from EURT, NTMC and background areas significantly differ from each other with respect to the qualitative and quantitative composition of allozyme phenes. An analysis of clonal diversity showed the uniqueness of all coenopopulations in terms of their phenogenetics. P-generation seed viability was found to decrease in a similar manner as all types of the industrial stress increased. Studies of F (1)-generation variability in radio- and metal resistance by family analysis showed that seed progeny from EURT impact zone possessed high viability that, however, was accompanied by development of latent injuries resulting in low resistance to additional man-caused impacts. In F (1)-generation originated from NTMC zone, high seed viability was combined with increased resistance to provocative heavy metal and radiation exposure. No significant differences in responses to 'habitual' and 'new' factors, i.e. pre-adaptation effect, were found in samples from the contaminated areas.
Laboratory of Population Radiobiology, Institute of Plant & Animal Ecology, Ural Branch of Russian Academy of Sciences, 202, 8-Marta Street, Yekaterinburg, Russian Federation. pozolotina@ipae.uran.ru
Vera N
VN
Pozolotina
Elena V
EV
Antonova
Victor S
VS
Bezel
D000222:Adaptation, Physiological / Q000187:drug effects; D018525:Germination / Q000187:drug effects*; D007527:Isoenzymes / Q000378:metabolism; D019216:Metals, Heavy / Q000633:toxicity*; D012639:Seeds / Q000187:drug effects / Q000528:radiation effects*; D012990:Soil Pollutants, Radioactive / Q000633:toxicity*; D031205:Taraxacum / Q000187:drug effects / Q000201:enzymology / Q000528:radiation effects*
D007527:Isoenzymes; D019216:Metals, Heavy; D012990:Soil Pollutants, Radioactive