Comparison of remote consequences in Taraxacum officinale seed progeny collected in radioactively or chemically contaminated areas
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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.
KeywordsRadiation Heavy metals Dandelion (Taraxacum officinale s.l.) Allozymes Viability Adaptation Transgeneration effect
This work was done with financial support from Program of the oriented basic researches between Institutes of UB RAS with state corporations of the Russian Federation (project No 12-4-002-NC) and Program of the multidisciplinary researches between Institutes of UB RAS (project No 12-M-24-2016), the Federal Special Scientific & Technical Program in support of leading scientific schools (SS-5325.2012.4). We are indebted to Prof. Tatjana Zhu’kova, Dr. Olga A. Timokhina, junior researcher Elina M. Karimullina and engineer Tatjana Ye. Belyaeva for technical assistance. Helpful remarks of two anonymous reviewers are gratefully acknowledged.
Conflict of interests
The authors declare that they have no conflicts of interests.
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