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dc.contributor.authorSobariu, Dana Luminita
dc.contributor.authorFertu, Daniela Ionela
dc.contributor.authorDiaconu, Mariana
dc.contributor.authorPavel, Lucian Vasile
dc.contributor.authorHlihor, Raluca-Maria
dc.contributor.authorDragoi, Elena Niculina
dc.contributor.authorCurteanu, Silvia
dc.contributor.authorLenz, Markus
dc.contributor.authorCorvini, Philippe
dc.contributor.authorGavrilescu, Maria
dc.date.accessioned2018-01-09T14:16:33Z
dc.date.available2018-01-09T14:16:33Z
dc.date.issued2017
dc.identifier.doihttps://doi.org/10.1016/j.nbt.2016.09.002
dc.identifier.urihttp://hdl.handle.net/11654/25780
dc.description.abstractCertain 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.
dc.description.urihttp://www.sciencedirect.com/science/article/pii/S1871678416324037?via%3Dihub
dc.language.isoen_US
dc.relation.ispartofNew Biotechnology
dc.accessRightsAnonymous
dc.subjectAzotobacter sp.
dc.subjectCadmium
dc.subjectChromium
dc.subjectLepidium sativum
dc.subjectRhizobacteria
dc.subjectTolerance
dc.titleRhizobacteria and Plant Symbiosis in Heavy Metal Uptake and Its Implications for Soil Bioremediation
dc.type01 - Zeitschriftenartikel, Journalartikel oder Magazin
dc.volume39
dc.issueA
dc.audienceScience
fhnw.publicationStatePublished
fhnw.ReviewTypeAnonymous ex ante peer review of a complete publication
fhnw.InventedHereYes
fhnw.PublishedSwitzerlandYes
fhnw.pagination125-134
fhnw.IsStudentsWorkno
fhnw.publicationOnlineJa


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