Root exudates from sunflower (<i>Helianthus annuus</i>L.) show a strong adsorption ability toward Cd(II)

Yang, Jianying; Pan, Xiangliang

doi:10.1080/17429145.2012.737030

Cited by 20 publications

(22 citation statements)

References 45 publications

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“…On the other hand, some studies have reported that root exudates reduced metal mobility due to their strong metal binding ability [101,102]. The immobilization of metals by root exudates may be a coping mechanism for exclusion (reduced uptake) of toxic HMs in nonmetal hyperaccumulators [103,104].…”

Section: Plant Characteristicsmentioning

confidence: 99%

Metal (Loid)s in Farmland Soils and Strategies to Reduce Bioavailability

Fayiga¹,

Nwoke²

2017

Open J Environ Biol

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High concentrations of heavy metal (loid)s (HMs) in farmland soils reduces crop yield and contaminates the food chain. Exposure to HMs in the diet results in several adverse health effects such as cancer, reproductive health problems and cardiovascular diseases. Understanding the origin and fractionation of these toxic substances will provide direction for reducing their bioavailability in contaminated farmland soils. HMs are added to farmland soils through activities such as irrigation, organic and inorganic fertilization, pest control, and mining. Weathering of parent material and atmospheric deposition can also increase the levels of HMs in the soil. Fractionation of HM contaminated soils provides information on availability of HMs such as Pb, Cd, As, Cr and Cu to soil biota and plants. Several studies have reported that Pb is mostly associated with Fe and manganese oxides (reducible fraction) while Cd is mostly associated with the most mobile fraction (exchangeable fraction). The application of organic and inorganic soil amendments such as vermiculite, zeolite, composts and crop residue to contaminated farmland soils converts HMs from the plant available fractions to the less mobile fractions. HM resistant microbes can change HMs to a less mobile fraction or less mobile oxidation state. The combination of HM resistant microbes, HM tolerant plants, and soil amendments can be used to reduce mobility of HMs in contaminated farmlands. Capsule:The mobility of heavy metal (loid)s in polluted farmland soils depends strongly on its association with soil components.

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Section: Plant Characteristicsmentioning

confidence: 99%

Metal (Loid)s in Farmland Soils and Strategies to Reduce Bioavailability

Fayiga¹,

Nwoke²

2017

Open J Environ Biol

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“…Some metals in the rhizosphere existed mainly as the complexation forms because the organic compounds from root exudates in the rhizosphere exhibited a strong affinity for metal (Hinsinger 2001;Krishnamurti et al 1997;Pan et al 2011;Yang and Pan 2013). The organic acids in the root exudate had a strong complexation ability toward heavy metals, and it was reported that the values of the overall stability constants (logK) of complexation of soluble exudates from maize (Z. mays L.) with metals (Pb, Cu, Cd, and Zn) reached to 3.65-3.15 (Pan et al 2011).…”

Section: Discussionmentioning

confidence: 99%

“…Organic compounds especially the organic acids in the root exudates under heavy mental stress can act as complexing agents of trace metal (Mucha et al 2005;Muhammada et al 2009;Turgut et al 2004;Yang and Pan 2013 ) so as to affect the phytoavailability of metal in soil and its translocation in plant tissues (Guo et al 2014;Soltani et al 2014). Root exudation is closely related to the mechanism of phytoremediation of heavy metal.…”

Section: Introductionmentioning

confidence: 99%

Organic acids, amino acids compositions in the root exudates and Cu-accumulation in castor (Ricinus communisL.) Under Cu stress

Huang

Guo

Yao

et al. 2015

International Journal of Phytoremediation

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Ricinus communis L. is a hyperaccumulation plant newly discovered in an abandoned land of Cu mine in China. A hydroponic experiment was then carried out to determine the root exudates in the Cu-tolerant castor (Ricinus communis L.). Plants were grown in nutrient solution with increasing level of Cu doses (0, 100, 250, 500, and 750 μmol/L Cu) in the form of CuSO4. Cu accumulation in the roots and shoots of castor, and root exudates collected from the castor were measured. The results indicated that the castor had a high Cu accumulation capacity and the Cu concentrations in the shoots and roots of the castor treated with 750 μmol/L Cu were 177.1, 14586.7 mg/kg, respectively. Tartaric was the largest in the root exudates in terms of concentrations, which reached up to 329.13 μmol/g (dry plant) in the level of 750 μmol/L Cu. There was a significantly positive linear relationship between the Cu concentration in root and the concentration of succinic (R = 0.92, P < 0.05), tartaric (R = 0.96, P < 0.01), and citric (R = 0.89, P < 0.05). These results indicated that the difference in root exudation from castor could affect their Cu tolerance. What is more, significant is that the high tartaric and citric, the low oxalic and cysteine in the root exudation of castor contributed to toleration of high Cu concentrations.

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“…A likely reason for the greater efficiency of the organic acids as extractants (i.e., closest to the L-value) is that the method is based on a simulation of reactions that occur in the rhizosphere (Yang and Pan, 2013), which also affect the L-value. Low molecular weight organic acids present in the rhizosphere are effective in solubilizing soil-linked metals (Marschner,1995).…”

Section: Extractant Effectiveness and The L Ratiomentioning

confidence: 99%