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Mag. Anna Burger

anna-burger11@hotmail.com
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Curriculum Vitae

Research activities

The response of some hyperaccumulating and excluding plants towards some selected radionuclides

Some heavy metals are also radionuclides (RN) that are characterized as an unstable form of chemical elements. Their concentration decreases after radioactive decay with emission of charged alpha and beta subatomic particles and high energetic gamma-rays. 238U, 90Sr, 137Cs occur as radioactive isotopes as well as stable elements (Sr, Cs). 238U, 90Sr and 137Cs are radiotoxic elements. 238U, however, has also a great risk of chemical toxicity; this may even surpass the radiological toxicity because of the large physical half-life time (4.5×109a for 238U).

Radionuclide emissions to the biosphere include: 1) fallout from atmospheric bomb tests of the 1950s and 1960s and major nuclear accidents, e.g. Chernobyl (important isotopes are 137Cs and 90Sr and, sad to say, recently Fukushima in Japan), 2) satellite re-entry, 3) routine emissions to the atmosphere from reprocessing plants and nuclear power stations (137Cs, 90S) and 4) waste disposal sites (238U), (Naito and Smith, 1998; Ould-Dada et al, 2001, Greger, 2004). The enrichment of RN in soil, water and air represent a great danger for health and environment.

Toxicity of 238U, 90Sr and 137Cs so far has only rarely been examined for plants but previous studies already described important toxicity effects of these RN on growth, development and plant nutrition. Some known stress reactions induced by accumulation of RN: chlorosis, macronutrient deficiency, accumulation of ROS and oxidative stress.

Only few species have evolved sophisticated mechanisms to control metal homeostasis at the level of uptake, distribution, sequestration, and export and to survive in toxic environments better than others ("metal-tolerant plants").

Most higher plants are so-called excluders; apoplastic barriers, exo-and endodermis, Casparian bands and suberin lamellae or binding by phytochelatines in their root systems block the entry of HM into the plant system (Seregin and Kozhevnikova, 2007).

Topics to be addressed:

1.    Availability of RN and their uptake into metal-tolerant and excluder plants
2.    Macroscopic effects of RN on plant photosynthetic perfomance, leaf and root size
3.    Deposition of RN in different plant parts and tissues

 

Publications

to be added

 

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Lastupdate: 04.04.2016 - 13:38