Zinc, Cadmium and Lead Accumulation and Characteristics of Rhizosphere Microbial Population Associated with Hyperaccumulator Sedum Alfredii Hance Under Natural Conditions

2009 ◽  
Vol 82 (4) ◽  
pp. 460-467 ◽  
Author(s):  
Long Xin-Xian ◽  
Zhang Yu-Gang ◽  
Jun Dai ◽  
Zhou Qixing
Keyword(s):  
Microbial Population ◽  
Sedum Alfredii ◽  
Natural Conditions ◽  
Sedum Alfredii Hance ◽  
Lead Accumulation ◽  
Zinc Cadmium ◽  
Cadmium And Lead

scholarly journals Auxin-Induced SaARF4 Downregulates SaACO4 to Inhibit Lateral Root Formation in Sedum alfredii Hance

2021 ◽  
Vol 22 (3) ◽  
pp. 1297
Author(s):  
Dong Xu ◽  
Zhuchou Lu ◽  
Guirong Qiao ◽  
Wenmin Qiu ◽  
Longhua Wu ◽  
...  
Keyword(s):  
Lateral Root ◽  
Ethylene Biosynthesis ◽  
Luciferase Assay ◽  
Sedum Alfredii ◽  
Ethylene Synthesis ◽  
Root Tips ◽  
Sedum Alfredii Hance ◽  
Auxin Distribution ◽  
Distribution Mode ◽  
High Level

Lateral root (LR) formation promotes plant resistance, whereas high-level ethylene induced by abiotic stress will inhibit LR emergence. Considering that local auxin accumulation is a precondition for LR generation, auxin-induced genes inhibiting ethylene synthesis may thus be important for LR development. Here, we found that auxin response factor 4 (SaARF4) in Sedum alfredii Hance could be induced by auxin. The overexpression of SaARF4 decreased the LR number and reduced the vessel diameters. Meanwhile, the auxin distribution mode was altered in the root tips and PIN expression was also decreased in the overexpressed lines compared with the wild-type (WT) plants. The overexpression of SaARF4 could reduce ethylene synthesis, and thus, the repression of ethylene production decreased the LR number of WT and reduced PIN expression in the roots. Furthermore, the quantitative real-time PCR, chromatin immunoprecipitation sequencing, yeast one-hybrid, and dual-luciferase assay results showed that SaARF4 could bind the promoter of 1-aminocyclopropane-1-carboxylate oxidase 4 (SaACO4), associated with ethylene biosynthesis, and could downregulate its expression. Therefore, we concluded that SaARF4 induced by auxin can inhibit ethylene biosynthesis by repressing SaACO4 expression, and this process may affect auxin transport to delay LR development.

Ethylenediamine-N,N′-diacetic acid complexes with divalent manganese, zinc, cadmium, and lead: a thermodynamic study

1979 ◽  
Vol 57 (1) ◽  
pp. 113-118 ◽  
Author(s):  
R. J. Gualtieri ◽  
W. A. E. McBryde ◽  
H. K. J. Powell
Keyword(s):  
Protonation Constants ◽  
Thermodynamic Study ◽  
Diacetic Acid ◽  
Calorimetric Data ◽  
Nmr Studies ◽  
Aqueous Acid ◽  
Manganese Zinc ◽  
Proton Dissociation ◽  
Zinc Cadmium ◽  
Cadmium And Lead

The four protonation constants are reported for the dianion of ethylenediamine-N,N′-diacetic acid(H2L),25°C, I = 0.10 M(KNO3), (log ki = 9.60, 6.51, 2.12, 1.3). log K(potentiometric) and ΔH(calorimetric) data are reported for the formation of the complexes [ML], M = Mn2+, Zn2+, Cd2+, and Pb2+ (log K = 6.87, 10.99, 9.16, and 10.66; ΔH = −2.9, −24.4, −16.7, and −28.0 kJ mol−1 respectively). The complexes [ZnL] and [PbL] undergo (aqua) proton dissociation reactions, [Formula: see text] log KD = −10.56 and −11.02, ΔHD = +60.7 and +38.5 kJ mol−1, respectively. Potentiometric and nmr studies indicate that the ligand undergoes a slow (metal catalysed) hydrolysis or rearrangement in aqueous acid.

scholarly journals Environmental Impacts of an Old Mine Tailings Deposit – Metal Concentrations and Water Pathways

1987 ◽  
Vol 18 (4-5) ◽  
pp. 301-312 ◽  
Author(s):  
P. Sandén ◽  
S. Karlsson ◽  
U. Lohm
Keyword(s):  
Environmental Impacts ◽  
Mine Tailings ◽  
Water Bodies ◽  
Contaminated Water ◽  
Surrounding Area ◽  
Metal Concentrations ◽  
Principal Source ◽  
Zinc Cadmium ◽  
Copper Zinc ◽  
Cadmium And Lead

Variations in metal concentrations in a heavily polluted stream receiving acidic leachates from an old mine tailings deposit are analysed from a hydrological perspective. From an extensive data material, collected during three years, the variations in concentrations of four metals (copper, zinc, cadmium and lead) are discussed. The deposit is the principal source for these metals in the watershed. The variation in metal concentrations in the vicinity of the deposit can to a large extent be explained by simple dilution of contaminated water with uncontaminated water from the surrounding area. Further downstream the deposit, other processes become increasingly important for the metal concentrations in the water bodies.

Nicotianamine Synthase Gene 1 from the hyperaccumulator Sedum alfredii Hance is associated with Cd/Zn tolerance and accumulation in plants

2019 ◽  
Vol 443 (1-2) ◽  
pp. 413-427 ◽  
Author(s):  
Shaoning Chen ◽  
Min Zhang ◽  
Ying Feng ◽  
Zulfiqar Ali Sahito ◽  
Shengke Tian ◽  
...  
Keyword(s):  
Sedum Alfredii ◽  
Sedum Alfredii Hance ◽  
Nicotianamine Synthase ◽  
Zn Tolerance

Copper substitution alone and in the presence of chromium, zinc, cadmium and lead in goethite (α-FeOOH)

Clay Minerals ◽  
2009 ◽  
Vol 44 (3) ◽  
pp. 293-310 ◽  
Author(s):  
N. Kaur ◽  
B. Singh ◽  
B. J. Kennedy
Keyword(s):  
Dissolution Rate ◽  
Unit Cell ◽  
Unit Cell Parameters ◽  
General Sequence ◽  
Cell Parameters ◽  
Molar Ratios ◽  
Zinc Cadmium ◽  
Cadmium And Lead ◽  
Copper Substitution

AbstractA series of Cu-substituted goethites, single and co-substituted with Cr, Zn, Cd and/or Pb was prepared, having molar ratios equal to 2.00, 3.33 and 5.00 mol%. All the samples contained only goethite, except Cu-, (Cu,Zn)- and (Cu,Pb)-samples synthesized at 5.00 mol% where hematite was also formed. The presence of Cr/Cd suppressed the hematite-forming effects of Cu. The general sequence of metal entry into the single-metal-substituted goethites was Zn = Cr > Cd > Cu > Pb and in di- (5.00 mol%) and tri- (3.33 mol%) metal-substituted goethites was Cu > Zn > Cd > Cr >> Pb. Cu incorporation increased all the unit-cell parameters in single-metal-substituted goethite, and these parameters increased in combination with other metals as follows: Cd > Zn > Cr > Pb in the multimetal-substituted goethites. The Cu-substituted goethite dissolved faster than pure goethite. Co substitutions of Cr/Pb reduced the dissolution rate (kFe), while substitutions of Cd/Zn increased kFe.

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