Impact of two iron(III) chelators on the iron, cadmium, lead and nickel accumulation in poplar grown under heavy metal stress in hydroponics

Cooperative Research Centre for Environmental Studies of Eötvös Loránd University, H-1518 Budapest, Hungary.
Journal of plant physiology (Impact Factor: 2.56). 04/2012; 169(6):561-6. DOI: 10.1016/j.jplph.2011.12.012
Source: PubMed


Poplar (Populus jacquemontiana var. glauca cv. Kopeczkii) was grown in hydroponics containing 10 μM Cd(II), Ni(II) or Pb(II), and Fe as Fe(III) EDTA or Fe(III) citrate in identical concentrations. The present study was designed to compare the accumulation and distribution of Fe, Cd, Ni and Pb within the different plant compartments. Generally, Fe and heavy-metal accumulation were higher by factor 2-7 and 1.6-3.3, respectively, when Fe(III) citrate was used. Iron transport towards the shoot depended on the Fe(III) chelate and, generally, on the heavy metal used. Lead was accumulated only in the root. The amounts of Fe and heavy metals accumulated by poplar were very similar to those of cucumber grown in an identical way, indicating strong Fe uptake regulation of these two Strategy I plants: a cultivar and a woody plant. The Strategy I Fe uptake mechanism (i.e. reducing Fe(III) followed by Fe(II) uptake), together with the Fe(III) chelate form in the nutrient solution had significant effects on Fe and heavy metal uptake. Poplar appears to show phytoremediation potential for Cd and Ni, as their transport towards the shoot was characterized by 51-54% and 26-48% depending on the Fe(III) supply in the nutrient solution.

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    • "antagonistic effects (Naaz and Pandey, 2010). Other authors analyzed the distribution, accumulation and selection of heavy metals on selective plants in the presence of chelating compounds (Csog et al., 2012; Mihucz et al., 2012). "
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    • "Metals can also trigger a series of changes that can lead to phytotoxicity (Gratão et al. 2009; Kopittke et al. 2010; Lux et al. 2011). Therefore, research into metal-induced plant stress is one of the most rapidly growing areas of agricultural research, which can be readily confirmed by the number of papers published weekly on this subject (Martinez-Penalver et al. 2012; Mihucz et al. 2012; Tian et al. 2012). Cd is a toxic metal because of its relatively high mobility in the soil–plant system (Benavides et al. 2005; Groppa et al. 2012). "
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    ABSTRACT: Cadmium (Cd) is an important metal due to its industrial use but also one of the most dangerous metals because of its accumulation in the environment. This can eventually lead to entrance into the food chain if the Cd is taken up by crop plants used for feeding animals and humans. Thus, a large number of reviews have discussed the many aspects of stress induced by Cd and other metals in a wide range of species. In relation to plants, useful reviews have been published over the years regarding molecular and biochemical aspects of Cd stress. In this minireview, we have concentrated on promising and emerging topics of Cd-stress research in plants, such as hormonal control of the antioxidant system and interaction between organisms and plants.
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