Sofia, Bulgaria
Sofia, Bulgaria

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Tzvetkova N.,University of Forestry | Miladinova K.,Biotree | Ivanova K.,Sofia University | Georgieva T.,Biotree | And 2 more authors.
Journal of Environmental Biology | Year: 2015

One-year-old two Paulownia lines {P.tomentosa x fortunei-TF 01 and P. elongatax fortune!-EF 02) were grown, as pot experiment, in soil collected from the field of waste depository of Kremikovtzi ferrous metallurgical industry near Sofia. The soil was heavily polluted with Cd. Metals content (Ca, Mg, K, Na, Cd, Cu, Pb, Zn and Fe) in soil and its distribution in roots, stems and leaves of both lines was studied. The results showed that Ca and K accumulated more in stem, Mg, Na, Fe and Cd in root, while Pb, Cu and Zn in the leaves of both lines. The bioaccumulation factor (BF) and translocation factor (TF) were evaluated in order to determine the potential of plants in removing metals from contaminated soil. The BF for Fe, Pb, Cu and Zn in TF 01 line exceeded that of EF 02 line-5.6; 1.03; 1.20; 1.14 times, respectively. TF was higher in TF 01 line for Fe, Pb and Cd (6.0; 1.92 and 1.03, respectively), but not for Cu and Zn. The success of phytoremediation depends on plant growth and restricted distribution of heavy metals in shoots. Our results showed that stem length and total leaf area of Paulownia elongata x fortuneI were higher than Paulownia tomentosax fortunei but BF for Cu and Zn and TF for Pb was less. BF for Cd was 1.7 times higher and TF for Zn was 1.03 times higher in Paulownia elongata x fortunei. Selected two lines {P. tomentosax fortune!-TF and P. elongatax fortunei- EF 02) were accumulators of Cu, Zn and Cd. Paulownia tomentosaxfortunei accumulated more Pband Zn in aboveground parts, while Paulownia elongatax fortunei -accumulated Zn only. These lines proved to be a promising species for phytoremediation of heavy metal polluted soils due to high biomass productivity.


Ivanova K.,Sofia University | Miladinova K.,BIOTREE | Georgieva T.,BIOTREE | Markovska Y.,Sofia University
Bulgarian Journal of Agricultural Science | Year: 2014

The effect of salt stress on activities of glutathione reductase (GR), ascorbate peroxidase (APX), catalase (CAT), guaiacol peroxidase (GPOX), total glutathione, ascorbate and H2O2 in three Paulownia lines (P. elongata x fortunei x elongata –T2, P. elongata x elongata –T4, P. elongata x kawakarnii –EK) grew as hydroponic culture at three levels of salinity, 50 mmol.l–1, 100 mmol.l–1, 200 mmol.l–1 sodium chloride (NaCl) solution was investigated. The magnitude of reduction of root, stem, leaf dry biomass and ratio total leaf area/ total dry biomass (LAR) were more pronounced in T4 than in T2 and EK after treatment. NaCl led to increase the leaf levels of H2O2, glutathione and ascorbate in T4 and T2, but not in EK. Salinity significantly inhibited the activities of CAT, GPOX and APX in T4. Increases in the enzyme activities by NaCl namely in T2 suggested that they might be playing a possible role in tolerance of this line to salinity. Our results suggested that T2 line was more tolerant to salt stress than EK and T4 lines. We were looking for suitable physiological and biochemical criterions in order to develop practicable strategy for selecting salt tolerant lines of Paulownia, which were produced by BioTree Ltd., Bulgaria. © 2014, National Centre for Agrarian Sciences. All rights reserved.

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