Chemical Speciation and Bioavailability of Copper: Uptake and Accumulation by Eichornia

Nor, Yahya M.; Cheng, H. H.

doi:10.1897/1552-8618(1986)5[941:csaboc]2.0.co;2

Cited by 15 publications

(16 citation statements)

References 1 publication

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“…1) and relevant Cd chemical species calculations (Table 2) showed that the more Cd complexed with organic acids, the greater the enhanced Cd uptake. Nor and Cheng (1986) reported that plant roots were able to liberate trace metals from dissolved organo-metallic complexes once they were associated with the root zone.…”

Section: Discussionmentioning

confidence: 99%

Enhanced cadmium accumulation in maize roots—the impact of organic acids

et al. 2006

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Low molecular weight organic acids are important components of root exudates and therefore, knowledge regarding the mechanisms of cadmium (Cd) uptake and distribution within plants under the influence of organic acids, is necessary for a better understanding of Cd behavior in the plant-soil system. In this study, acetic and malic acids increased the uptake of Cd by maize (Zea mays L. cv. TY2) roots and enhanced Cd accumulation in shoots under hydroponic conditions. Concentration-dependent net Cd influx in the presence and absence of organic acids could be resolved into linear and saturable components. The saturable component followed Michaelis-Menten kinetics, which indicated that Cd uptake across the plasma membrane was transporter-mediated. While the K m values were similar, the V max values in the presence of acetic and malic acids were respectively 6.0 and 3.0 times that of the control. Zinc transporters were the most probable pathways for Cd accumulation. It was hypothesized that Cd(II)-organic acid complexes associated with the root zone, could decompose and liberate Cd 2+ for subsequent absorption by maize roots; and that in the layer of the roots or within the root free space, depletion of Cd 2+ was buffered by the presence of Cd(II)-organic acid complexes. Plant response to elevated Cd levels involved overproduction of organic acids in maize roots as a resistance mechanism to alleviate Cd toxicity.

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Section: Discussionmentioning

confidence: 99%

Enhanced cadmium accumulation in maize roots—the impact of organic acids

et al. 2006

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“…To what is known there are no organometallic complexes carriers in the root plasma membrane (Bell et al, 2003), significant rates of diffusion of Cd-synthetic chelates are unlikely, due to the high polarity and large size of these complexes to move across the lipid layer (Han et al, 2006). The higher uptake of Cd in presence of chelates is probably due to the fact that plant roots are able to liberate trace metals from dissolved organo-metallic complexes (Nor & Cheng, 1986). Cr exhibited higher uptake upon application of organic acids.…”

Section: Effects Of Organic Acid Application In Root Uptakementioning

confidence: 99%

The role of organic acids in assisted phytoremediation processes of salt marsh sediments

Duarte¹,

Freitas²,

Caçador³

2011

Hydrobiologia

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Some plants have high ability to absorb heavy metals in high concentrations. In this study, Spartina maritima was tested in conjunction with low molecular weight organic acids (LMWOA), in order to evaluate the possible use of this plant in phytoremediation processes in salt marshes. Three different LMWOA (citric acid, malic acid and acetic acid) were applied to contaminated intact cores of S. maritima colonized sediment and several heavy metals (Cd, Zn, Pb, Cu, Cr and Ni) were analyzed in sediment and plant parts. Acetic acid application proved to be the most efficient, enhancing greatly the uptake of all metals analyzed. Citric acid also showed good results, while malic acid proved to be very inefficient in most of the cases. The highest enhancement was observed for Cr with a 10-fold increase of the uptake upon application of acetic acid, while improving the Pb uptake proved to be the most difficult, probably due to its low solubility.

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“…On the other hand, soluble organic acids may raise the carrying capacity of uptake solution for trace metals by the formation of soluble organo-metallic complexes, and high concentration of organic acids may promote trace metal adsorption onto the root surface (McBride, 1995). In addition, according to Nor and Cheng (1986) that plant roots are able to liberate trace metals from dissolved organo-metallic complexes once they are associated in the root zone.…”

Section: Concentration-dependent Kinetics Of Lanthanum Uptake Under Tmentioning

confidence: 99%

Effects of low-molecular-weight organic acids on uptake of lanthanum by wheat roots

Wang¹,

Zhang²,

Shan³

2004

Plant and Soil

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Effects of low-molecular-weight organic acids (LMWOAs) on the uptake of lanthanum by wheat (Triticum aestivum L.) roots were studied under hydroponic conditions. Acetic and malic acids were chosen as the representatives of LMWOAs. Uptake kinetics of lanthanum indicated that when lanthanum concentrations in the uptake solutions were high or uptake time was long lanthanum uptake by roots was enhanced by LMWAOs. After wheat was cultured in the uptake solution of lanthanum containing acetic or malic acids for 48 h the uptake of lanthanum by roots increased by 57 and 44%, respectively, compared with that in the absence of acetic and malic acids. The increase in uptake of lanthanum was determined by the ratio of the concentrations of organic acids to lanthanum in the uptake solutions. The highest uptake of lanthanum was obtained at the ratio of 5:1.

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Chemical Speciation and Bioavailability of Copper: Uptake and Accumulation by Eichornia

Cited by 15 publications

References 1 publication

Enhanced cadmium accumulation in maize roots—the impact of organic acids

Enhanced cadmium accumulation in maize roots—the impact of organic acids

The role of organic acids in assisted phytoremediation processes of salt marsh sediments

Effects of low-molecular-weight organic acids on uptake of lanthanum by wheat roots

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