Rhizobacteria and Plant Symbiosis in Heavy Metal Uptake and Its Implications for Soil Bioremediation
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Authors
Sobariu, Dana Luminita
Fertu, Daniela Ionela
Diaconu, Mariana
Pavel, Lucian Vasile
Hlihor, Raluca-Maria
Dragoi, Elena Niculina
Curteanu, Silvia
Gavrilescu, Maria
Author (Corporation)
Publication date
2017
Typ of student thesis
Course of study
Collections
Type
01A - Journal article
Editors
Editor (Corporation)
Supervisor
Parent work
New Biotechnology
Special issue
ICEEM08
DOI of the original publication
Link
Series
Series number
Volume
39
Issue / Number
Part A
Pages / Duration
125-134
Patent number
Publisher / Publishing institution
Elsevier
Place of publication / Event location
Edition
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Abstract
Certain species of plants can benefit from synergistic effects with plant growth-promoting rhizobacteria (PGPR) that improve plant growth and metal accumulation, mitigating toxic effects on plants and increasing their tolerance to heavy metals. The application of PGPR as biofertilizers and atmospheric nitrogen fixators contributes considerably to the intensification of the phytoremediation process. In this paper, we have built a system consisting of rhizospheric Azotobacter microbial populations and Lepidium sativum plants, growing in solutions containing heavy metals in various concentrations. We examined the ability of the organisms to grow in symbiosis so as to stimulate the plant growth and enhance its tolerance to Cr(VI) and Cd(II), to ultimately provide a reliable phytoremediation system. The study was developed at the laboratory level and, at this stage, does not assess the inherent interactions under real conditions occurring in contaminated fields with autochthonous microflora and under different pedoclimatic conditions and environmental stresses. Azotobacter sp. bacteria could indeed stimulate the average germination efficiency of Lepidium sativum by almost 7%, average root length by 22%, average stem length by 34% and dry biomass by 53%. The growth of L. sativum has been affected to a greater extent in Cd(II) solutions due its higher toxicity compared to that of Cr(VI). The reduced tolerance index (TI, %) indicated that plant growth in symbiosis with PGPR was however affected by heavy metal toxicity, while the tolerance of the plant to heavy metals was enhanced in the bacteria-plant system.
A methodology based on artificial neural networks (ANNs) and differential evolution (DE), specifically a neuro-evolutionary approach, was applied to model germination rates, dry biomass and root/stem length and proving the robustness of the experimental data. The errors associated with all four variables are small and the correlation coefficients higher than 0.98, which indicate that the selected models can efficiently predict the experimental data.
Keywords
Azotobacter sp., Cadmium, Chromium, Lepidium sativum, Rhizobacteria, Tolerance
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ISBN
ISSN
1871-6784
1876-4347
1876-4347
Language
English
Created during FHNW affiliation
Yes
Strategic action fields FHNW
Publication status
Published
Review
Peer review of the complete publication
Open access category
License
Citation
Sobariu, D. L., Fertu, D. I., Diaconu, M., Pavel, L. V., Hlihor, R.-M., Dragoi, E. N., Curteanu, S., Lenz, M., Corvini, P., & Gavrilescu, M. (2017). Rhizobacteria and Plant Symbiosis in Heavy Metal Uptake and Its Implications for Soil Bioremediation. New Biotechnology, 39(Part A), 125–134. https://doi.org/10.1016/j.nbt.2016.09.002