Main rhizosphere characteristics of the Cd hyperaccumulator Rorippa globosa (Turcz.) Thell

Wei, Shuhe; Twardowską, Irena

doi:10.1007/s11104-013-1783-0

Cited by 44 publications

(13 citation statements)

References 41 publications

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“…Labile organic C produced by degradation of roots or exudation of organic compounds may influence the solubility of metals due to formation of metal-C complexes (Otero et al 2012). Similar to our study, the increasing of labile C in the rhizosphere of hyperaccumulators was reported by previous studies (Kim et al 2010;Wei and Twardowska 2013). Thus, in this study, Fig.…”

Section: Effects Of S Alfredii Growth On Soil Chemical Characteristicssupporting

confidence: 92%

“…Hyperaccumulators could enhance metal solubility via exudation of organic acids (Fitz and Wenzel 2002). As to Cd hyperaccumulation, the increase of Cd uptake because of the decrease of rhizosphere soil pH was reported (McGrath et al 1997;Wei and Twardowska 2013). However, the controversy existed in the literature about the effects of hyperaccumulator growth on rhizosphere pH.…”

Section: Effects Of S Alfredii Growth On Soil Chemical Characteristicsmentioning

confidence: 99%

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Distance-dependent varieties of microbial community structure and metabolic functions in the rhizosphere of Sedum alfredii Hance during phytoextraction of a cadmium-contaminated soil

Yang

Zhang

Lin

et al. 2017

Environ Sci Pollut Res

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The recovery of microbial community and activities is crucial to the remediation of contaminated soils. Distance-dependent variations of microbial community composition and metabolic characteristics in the rhizospheric soil of hyperaccumulator during phytoextraction are poorly understood. A 12-month phytoextraction experiment with Sedum alfredii in a Cd-contaminated soil was conducted. A pre-stratified rhizobox was used for separating sub-layer rhizospheric (0-2, 2-4, 4-6, 6-8, 8-10 mm from the root mat)/bulk soils. Soil microbial structure and function were analyzed by phospholipid fatty acid (PLFA) and MicroResp™ methods. The concentrations of total and specified PLFA biomarkers and the utilization rates for the 14 substrates (organic carbon) in the 0-2-mm sub-layer rhizospheric soil were significantly increased, as well as decreased with the increase in the distance from the root mat. Microbial structure measured by the ratios of different groups of PLFAs such as fungal/bacterial, monounsaturated/saturated, ratios of Gram-positive to Gram-negative (GP/GN) bacterial, and cyclopropyl/monoenoic precursors and 19:0 cyclo/18:1ω7c were significantly changed in the 0-2-mm soil. The PLFA contents and substrate utilization rates were negatively correlated with pH and total, acid-soluble, and reducible fractions of Cd, while positively correlated with labile carbon. The dynamics of microbial community were likely due to root exudates and Cd uptake by S. alfredii. This study revealed the stimulations and gradient changes of rhizosphere microbial community through phytoextraction, as reduced Cd concentration, pH, and increased labile carbons are due to the microbial community responses.

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Section: Effects Of S Alfredii Growth On Soil Chemical Characteristicssupporting

confidence: 92%

Section: Effects Of S Alfredii Growth On Soil Chemical Characteristicsmentioning

confidence: 99%

Distance-dependent varieties of microbial community structure and metabolic functions in the rhizosphere of Sedum alfredii Hance during phytoextraction of a cadmium-contaminated soil

Yang

Zhang

Lin

et al. 2017

Environ Sci Pollut Res

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“…The secretions of hyperaccumulator roots can enhance metal availability by decreasing soil pH or forming soluble DOM-metal complexes (Dessureault-Rompre et al, 2010;Li et al, 2013a,b). In addition, the associated microorganisms and their activities in hyperaccumulator rhizosphere soil also play a role in enhancing metal availability (Li et al, 2010;Wei and Twardowska, 2013). In addition to the microbial activities, soil bound metals can be released with the transformation of Fe/Al/Mn oxides when there is a shift in soil redox conditions (Husson, 2013) or decomposition of soil organic matter.…”

Section: Soil Metal Processes During Phytoextractionmentioning

confidence: 99%

Changes in metal availability, desorption kinetics and speciation in contaminated soils during repeated phytoextraction with the Zn/Cd hyperaccumulator Sedum plumbizincicola

Jia

et al. 2016

Environmental Pollution

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a b s t r a c tPhytoextraction is one of the most promising technologies for the remediation of metal contaminated soils. Changes in soil metal availability during phytoremediation have direct effects on removal efficiency and can also illustrate the interactive mechanisms between hyperaccumulators and metal contaminated soils. In the present study the changes in metal availability, desorption kinetics and speciation in four metal-contaminated soils during repeated phytoextraction by the zinc/cadmium hyperaccumulator Sedum plumbizincicola (S. plumbizincicola) over three years were investigated by chemical extraction and the DGT-induced fluxes in soils (DIFS) model. The available metal fractions (i.e. metal in the soil solution extracted by CaCl 2 and by EDTA) decreased greatly by >84% after phytoextraction in acid soils and the deceases were dramatic at the initial stages of phytoextraction. However, the decreases in metal extractable by CaCl 2 and EDTA in calcareous soils were not significant or quite low. Large decreases in metal desorption rate constants evaluated by DIFS were found in calcareous soils. Sequential extraction indicated that the acid-soluble metal fraction was easily removed by S. plumbizincicola from acid soils but not from calcareous soils. Reducible and oxidisable metal fractions showed discernible decreases in acid and calcareous soils, indicating that S. plumbizincicola can mobilize non-labile metal for uptake but the residual metal cannot be removed. The results indicate that phytoextraction significantly decreases metal availability by reducing metal pool sizes and/or desorption rates and that S. plumbizincicola plays an important role in the mobilization of less active metal fractions during repeated phytoextraction.

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“…This could result with an increase in the extraction effi ciency of Cd in shoots of R. globosa by 42.8 % as compared to its single maturity state when the plant was transplanted into contaminated soils (Wei and Zhou 2006 ). A comparative assessment of hyperaccumulative capability of two different species of Rorippa was carried out by Wei and Twardowska ( 2013 ). Six Cd treatments were experimentally designed and treatment was given to two species Rorippa globosa and Rorippa palustri .…”

Section: Rorippa Globosa Hyperaccumulative Actionmentioning

confidence: 99%

Phytoremediation

2015

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Main rhizosphere characteristics of the Cd hyperaccumulator Rorippa globosa (Turcz.) Thell

Cited by 44 publications

References 41 publications

Distance-dependent varieties of microbial community structure and metabolic functions in the rhizosphere of Sedum alfredii Hance during phytoextraction of a cadmium-contaminated soil

Distance-dependent varieties of microbial community structure and metabolic functions in the rhizosphere of Sedum alfredii Hance during phytoextraction of a cadmium-contaminated soil

Changes in metal availability, desorption kinetics and speciation in contaminated soils during repeated phytoextraction with the Zn/Cd hyperaccumulator Sedum plumbizincicola

Phytoremediation

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