Effects of multiple stressors exposures on plant populations

The results of long-term field studies in the Bryansk region of Russia affected by the Chernobyl accident, and in the Semipalatinsk Test Site, Kazakhstan are discussed. Findings obtained clearly indicate that chronic low dose exposure appears to be an ecological factor creating preconditions for possible changes in the genetic structure of a population. Plant populations growing in areas with relatively low levels of pollution are characterized by the increased level of both cytogenetic disturbances and genetic diversity. Under conditions of chronic exposure in pine tree populations were developed seed descendants with significantly lower reproductive ability than in the reference population.

The majority of abiotic stress studies performed under controlled conditions in laboratory does not reflect the actual situations that occur in the field. Therefore, to understand effects of contaminant exposure on natural populations properly we must pay attention to what is actually going on in the field. Field studies are particularly useful for assessing long-term biological effects induced by chronic low dose-rate and multi-pollutant exposure at contaminated sites. Up to now we have known little about responses of plant and animal populations to environmental pollutants in their natural environments. Although radionuclides and heavy metals cause primary damage at the molecular level, there are emergent effects at the level of populations, non-predictable solely from the knowledge of elementary mechanisms of the pollutants’ influence. The knowledge gained from field research would be valuable at the most fundamental level for increasing our understanding of microevolution and plant response to stress. Previously completed and ongoing field studies that have been carried out in our laboratory in different species of wild and agricultural plants are briefly summarized in Table 1. Details of the studies’ designs and methods could be found in the corresponding papers [1-7]. It is easy to see that these experiments cover a wide range of radioecological situations and climatic zones. Here are discussed two field studies to illustrate the main findings.



Copyright: © Aristotle University of Thessaloniki
Source: 2nd International Conference 2009 (Juni 2009)
Pages: 6
Price: € 5,00
Autor: S.A. Geras’kin
J.S. Vanina
Evgeny M. Mozolin
A.A. Oudalova
N.S. Dikareva

Send Article Add to shopping cart Comment article


These articles might be interesting:

Protection against Mg2+, Cu2+ and Zn2+ toxicity through siderophore in Frankia strains nodulating Hippöphae salicifolia D. Don
© Aristotle University of Thessaloniki (6/2009)
To study the role of siderophore in protecting the frankial strains from metal toxicity, Frankia strains were grown in presence of Mg2+, Cu2+ and Zn2+. Growth was observed up to (500 uM) Mg2+, (10 uM) Cu2+ and (10 uM) Zn2+ and maximum at 200 uM Mg2+, 1 uM Cu2+ and 1 uM Zn2+.

Application of computer modelling for forecasting of contaminants distribution in soil
© Aristotle University of Thessaloniki (6/2009)
An outlook of various methods of computer modeling application for the analysis and forecasting of contaminants migration in the soil is being discussed. A new mathematical model of contaminants transport in near-surface soil layer under non-isothermal conditions is being proposed. The given model takes into account the soil moisture content change effecting the solute transport and sorption owing to evaporation processes and recondensation of water vapor. The article also covers the possibility of hybrid expert systems (HES) application for solving contaminants migration in the soil. Distinguish structure of HES that includes models hybridization is being proposed. On the basis of given methods and models a new software has been developed.

Fukushima Fixation – The Media Focus on Radiation Risk in Tsunami-Stricken Japan
© Lexxion Verlagsgesellschaft mbH (6/2011)
Twenty five years on from Chernobyl, the tragic events in Japan of March 2011 seem to reaffirm the risk society’ perspective which the 1986 nuclear accident in the former Soviet Union did so much to popularise. It was amidst widespread predictions of mass harm – projected both across Europe and into the future – that German sociologist Ulrich Beck’s book of the same name found such a receptive audience. Beck wrote of a new era defined by the greater risk posed by ‘manufactured’, technological risk than natural, ‘external’ ones.

Content of macroelements in Avena sativa L., Brassica napus var. oleifera and Lupinus luteus L. after contamination of soil by copper and zinc
© Aristotle University of Thessaloniki (6/2009)
The aim of the study was to determine the effect of copper and zinc contamination on macroelements content in plants. Research was located on two alkaline soils which in natural conditions were formed with loamy sand and sandy loam. The soil was contaminated with copper (Cu) and zinc (Zn) at the following rates: 0, 150 and 450 mg/kg of soil.

Growth inhibition and decrease of photosynthetic activity exhibited by selected Microcystis aeruginosa strains exposed to dodecylethyldimethyl-ammonium bromide
© Aristotle University of Thessaloniki (6/2009)
The growth inhibition and decrease of photosynthetic oxygen production, induced by dodecylethyldimethyl-ammonium bromide on selected Microcystis aeruginosa strains from Doñana Park, were analyzed. A concentration-dependent growth response was obtained for all strains with the presence of this quaternary ammonium compound in culture medium, and there are significant differences in the sensitive grade exhibited by each one of them.

Username:

Password:

 Keep me signed in

Forgot your password?