Organic acids enhance the uptake of lead by wheat roots

Wang, Huanhua; Shan, Xiao-quan; Liu, Tao; Xie, Yaning; Wen, Bin; Zhang, Shuzhen; Han, Fang; Genuchten, Martinus Th. van

doi:10.1007/s00425-006-0433-7

Cited by 34 publications

(28 citation statements)

References 46 publications

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“…which is more easily absorbed or taken up by roots. The mechanism is very similar to the one verified for Cd (Wan et al, 2007). Only acetic acid application promoted an effective enhancement of Pb uptake, probably due to the low stability constant of complex and consequent higher facilitation for the plant uptake (Han et al, 2005).…”

Section: Effects Of Organic Acid Application In Root Uptakementioning

confidence: 53%

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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Section: Effects Of Organic Acid Application In Root Uptakementioning

confidence: 53%

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

Duarte¹,

Freitas²,

Caçador³

2011

Hydrobiologia

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“…membrane transporters) and/or facilitated diffusion (ion channels). Most of the reports dealing with lead transport are related to terrestrial plants (Sunkar et al 2000;Wang et al 2007) and little is known about floating aquatic plants (Paganetto et al 2001). Olguín et al (2005) have suggested that in S. minima, Pb 2+ is accumulated intracellularly through the use of calcium channels.…”

Section: Discussionmentioning

confidence: 99%

Assessment of the Hyperaccumulating Lead Capacity of Salvinia minima Using Bioadsorption and Intracellular Accumulation Factors

Sánchez-Galván

Monroy

Gómez

et al. 2008

Water Air Soil Pollut

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Salvinia minima has been reported as a cadmium and lead hyperaccumulator being the adsorption and intracellular accumulation the main uptake mechanisms. However, its physicochemical properties, the effect of metal concentration and the presence of organic and inorganic compounds on its hyperaccumulating capacity are still unknown. Furthermore, the specific adsorption and accumulation mechanisms occurring in the plant are not clear yet. Thus, based on a compartmentalization analysis, a bioadsorption (BAF) and an intracellular accumulation factor (IAF) were calculated in order to differentiate and quantify these two mechanisms. The use of kinetic models allowed predicting the specific type of uptake mechanisms involved. Healthy plants were exposed to five lead concentrations ranging from 0.80± 0.0 to 28.40±0.22 mg Pb 2+ l −1 in batch systems. A synthetic wastewater, amended with propionic acid and magnesium sulfate, and deionized water were used as media. The BAF and IAF contributed to gain an indepth insight into the hyperaccumulating lead capacity of S. minima. It is clear that such capacity is mainly due to adsorption (BAF 780-1980) most likely due to its exceptional physico-chemical characteristics such as a very high surface area (264 m 2 g −1 ) and a high content of carboxylic groups (0.95 mmol H + g −1 dw). Chemisorption was predicted as the responsible mechanism according to the pseudo-second order adsorption model. Surprisingly, the ability of S. minima to accumulate the metal into the cells (IAF 57-1007) was not inhibited at concentrations as high as 28.40±0.22 mg Pb 2+ l −1 .

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“…Furthermore, it has been understood that EDTA has a low biodegradability and is very persistent in the environment (Wasay et al 1998). Finally, acetic acid is very cheap and easily decomposed in the nature; the function of acetic acid in the heavy metal (Pb) accumulation by plant has been reported by hydroponics research (Wang et al 2007). Wang et al (2009) reported that acetic acid could promote Cu accumulation in wheat in contaminated soil.…”

Section: Introductionmentioning

confidence: 97%

Physiological response of Cu and Cu mine tailing remediation of Paulownia fortunei (Seem) Hemsl

et al. 2011

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The physiological responses and Cu accumulation of Paulownia fortunei (Seem) Hemsl. were studied under 15.7-157 μmol L(-1) Cu treatments in liquid culture for 14 days; the impacts of Cu concentration in the seedlings were evaluated under Cu mine tailing culture with acetic acid and EDTA treatment for 60 days. Results showed that the concentrations of Chl-a, Chl-b and Carotenoids significantly increased (p < 0.05) at 15.7-78.7 μmol L(-1)Cu treatment and significantly decreased at 157 μmol L(-1) treatment after 14 days of Cu exposure. The activities of superoxide dismutase (SOD) and catalase (CAT) significantly increased as Cu levels were enhanced and the activities of both SOD and CAT under 157 μmol L(-1) Cu stress were 2.9 and 1.9 times higher than that of control, respectively. The concentrations of proline and soluble sugars in the leaves of P. fortunei significantly increased as the Cu concentrations were elevated. Cu concentrations in roots, stems and leaves of P. fortunei increased significantly as Cu levels increased and reached 1911, 101 and 93 μg g(-1) dry weights (DW) at 157 μmol L(-1) Cu treatment, respectively. The seedlings of P. fortunei cultivated in Cu tailing experienced unsuccessful growth and loss of leaves in all treatments due to poor nutrition of the Cu tailing. The dry weight of P. fortunei increased under all the treatments of acetic acid after 60 days exposure. However, dry weight significantly decreased under both levels of EDTA. The Cu concentrations increased significantly in roots and decreased in leaves when each was treated with both concentrations of acetic acid. The Cu concentrations in the roots, stems and leaves increased significantly, and the concentrations of Cu in the stems and leaves under the treatment of 2 μmol L(-1) EDTA reached 189.5 and 763.1 μg g(-1) DW, respectively. The result indicated that SOD, CAT, proline and soluble sugars played an important role in coping with the oxidative stress of copper. Acetic acid could promote growth and EDTA at the experimental levels, which could also enhance Cu absorption and translocation into the stems and leaves of P. fortune. Furthermore, acetic acid and EDTA could be rationally utilized in Cu-contaminated soil.

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Organic acids enhance the uptake of lead by wheat roots

Cited by 34 publications

References 46 publications

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

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

Assessment of the Hyperaccumulating Lead Capacity of Salvinia minima Using Bioadsorption and Intracellular Accumulation Factors

Physiological response of Cu and Cu mine tailing remediation of Paulownia fortunei (Seem) Hemsl

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