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01.Phytoremediation of Heavy Metals using Poplars (Populus spp): A Glimpse of the Plant Responses to Copper, Cadmium and Zinc Stress pp. 387-414
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Impact of Plant Growth Promoting Rhizobacteria Pseudomonas in Phytoremediation Process pp. 551-572 $100.00
Authors:  (T.V. Siunova, T.O. Anokhina, O.I. Sizova, V.V. Kochetkov, A.M. Boronin, Institute of Biochemistry and Physiology of Microorganisms, Russian Academy of Sciences (RAS), Russia)
Abstract:
Plant growth promoting rhizobacteria (PGPR) Pseudomonas P. aureofaciens, P. chlororaphis, P. fluorescens and their plasmid-bearing variants: destructors of polycyclic aromatic hydrocarbons (PAH) (naphthalene, phenanthrene), strains resistant to heavy metals (cobalt, nickel) and metalloids (arsenic), and multifunctional ones combined both characteristics, were used to estimate their impact in the phytoremediation process. All used bacterial strains that possessed ability to produce phytohormone indole acetic acid, various antifungal compounds, and suppressed phytopathogens. The PGPR strain's ability to degrade naphthalene and phenanthrene was shown to be stable in the rhizosphere at different conditions. The introducing of PGPR destructors in the rape rhizosphere increased the naphthalene biodegradation efficiency up to 90% in comparison with control without bacteria at gnotobiotic system in 7 days cultivation. The arsenite resistant PAH-destructors P. aureofaciens BS1393(pBS216,pKS1) and P. chlororaphis PCL1391(pBS216,pKS1) also promoted mostly complete naphthalene degradation at the same experiments supplemented arsenite (15 mg/kg). It was shown, that the most active strains P. fluorescens 38a(pBS216) and P. aureofaciens OV17(pOV17) in the barley rhizosphere decreased the phenanthrene concentration 2 and 3 times respectively in 28 days in pot experiments. The impact of rhizosphere strains in plant accumulation of heavy metals/metalloids was tested in pot experiments. The cobalt-nickel resistant strain P. aureofaciens BS1393(pBS501) promoted growth of barley plants and protected from chlorosis contrary to the sensitive strain P. aureofaciens BS1393 in soil containing 235940 mg Ni/kg. In one month growing the nickel accumulation in plant biomass increased by 5.6 and 2.5 times in the case of sensitive and resistant strain, respectively, compared to non-treated plants. The sorghum plants, inoculated by the resistant P. aureofaciens BS1393(pKS1) and phosphate-dissolving P. aureofaciens BS1393(pUCP22:gltA) strains accumulated arsenic in plant biomass on an average of 25% more than non-treated plants in one month growing on arsenic contaminated soil (100 mg/kg). Nevertheless, the amount of bacteria in the plant rhizosphere varied, depending on bacterial species, plasmids occurrence and experiment conditions, but PGPR inoculation of plants protected them against PAH and metal/metalloid phytotoxicity, promoted seed germination and plant biomass. 


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Impact of Plant Growth Promoting Rhizobacteria Pseudomonas in Phytoremediation Process pp. 551-572