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
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.
Available from: Erzsebet Buta
- "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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ABSTRACT: The uptake capacity of the aquatic plants (Salvinia natans Kunth., Eichhornia crassipes Mart., Lemna minor L., Elodea canadensis Michx., Pistia stratiotes L.) was analyzed in phytoextraction of Cu 2+ , Zn 2+ , and Cd 2+ . It was attend to study the plants capacity comparatively using mono and multimetallic systems. In particular, the chlorophyll, protein and carotenoids contents were studied during heavy metals uptake, in order to observe the stress effect on plants. The results obtained for the monometallic system showed that Salvinia natans Kunth. accumulated the highest quantity of Cu 2+ (4.72 mg/g), Zn 2+ (2.23 mg/g) and Cd 2+ (1.90 mg/g). The leaves of Lemna minor L. accumulated the highest concentration of Cu 2+ (10.80 mg/g) and Cd 2+ (2.78 mg/g) in multimetallic system. The water lettuce (Pistia stratiotes L.) translocated the highest quantity of Zn 2+ in its roots (4.80 mg/g). The chlorophyll and the carotenoids levels decreased under the stress of heavy metals in both systems, while protein content increased under the influence of Cu 2+ and Cd 2+ , but decreased for Zn 2+ . The studied hydrophytes proved to be useful in the uptake of heavy metals in monometallic system and much more effective in the multimetallic system and showed great potential for further applications in the industrial and commercial wastewater treatments.
Available from: Ricardo Antunes Azevedo
- "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.
Available from: Bruno Printz
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ABSTRACT: Alnus sp. are actinorhizal trees commonly found in wet habitats and able to grow effectively in soil slightly contaminated with metal trace-elements. Two clones belonging to 2 Alnus species, namely A. incana and A. glutinosa were grown in hydroponics and exposed for 9 weeks to a Cd + Ni + Zn polymetallic constraint. Although responding by a similar decrease in total biomass production, the proteomic analysis associated with the study of various biochemical parameters including carbohydrate and mineral analyses revealed that the 2 clones have a distinct stress-responsive behaviour. All parameters indicated that the roots - the organ in direct contact with the media - are more affected than the leaves. In fact, in A. glutinosa the response was almost completely confined to the roots whereas many proteins change significantly in the roots and in the leaves of the A. incana treated. In both clones, the changes affected a broad range of metabolic processes like redox regulation, energetic metabolism, and induced the production of pathogenesis-related proteins. In particular, changes in the accumulation of bacterial proteins that were not identified as coming from the known symbionts of Alnus were reported. Further investigation should be performed to identify their origin and exact role in the plant response to the polymetallic exposure tested here.
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