Pathways of cadmium fluxes in the root of the halophyte Suaeda salsa

Li, Lianzhen; Liu, Xiaoli; Peijnenburg, Willie J.G.M.; Zhao, Jianmin; Chen, Xiaobing; Yu, Junbao; Wu, Huifeng

doi:10.1016/j.ecoenv.2011.09.007

Cited by 79 publications

(60 citation statements)

References 33 publications

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“…Farrell et al (2005) also observed that the mean net Cd 2+ influx at the root surface of four durum wheat cultivars was greatest at a distance of 0.5-1.5 mm from the root tip and decreased with increasing distance from the tip. Our previous study also indicated that the Cd 2+ influx in the rhizosphere of the Halophyte Suaeda salsa was greatest near the root tip (within 150 μm of the tip) (Li et al 2012). Although similar patterns were observed for the wetland plants Typha latifolia and Canna indica used in the present study, the net Cd 2+ flux was much greater than the flux observed for wheat (Pineros et al 1998) and Halophyte (Li et al 2012).…”

Section: Discussioncontrasting

confidence: 41%

“…The presence of these ions may compete for the uptake sites on the plant cell thereby inhibiting the absorption and decreasing the internalization flux. According to our previous study (Li et al 2012), Cd 2+ uptake by halophytic species such as Suaeda salsa is regulated by Ca transporters or channels in root cell plasma membranes. This has been shown through the use of verapamil, a voltage-dependent Ca channel blocker, and La 3+ , a voltage-independent Ca channel blocker, both of which inhibited Cd influx into roots.…”

Section: Resultsmentioning

confidence: 99%

“…Only electrodes with Nernstian slopes >25 mV per decade were used. Details on fabrication and calibration of ISMEs have been described previously (Li et al 2012;Ma et al 2010). …”

Section: Construction and Characterization Of Pb 2+ And Cu 2+ Ismesmentioning

confidence: 99%

“…To our knowledge, only a Cd 2+ liquid-membrane ion selective microelectrode (ISME) was routinely applied in the root system (Pineros et al 1998;Farrell et al 2005;Li et al 2012), although several other heavy metal ions (e.g. Zn 2+ , Cu 2+ , Pb 2+ ) can also be measured using commercially available ionophores with suitable selectivities and response times (Papernik et al 1996).…”

Section: Introductionmentioning

confidence: 99%

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Determining the fluxes of ions (Pb2+, Cu2+ and Cd2+) at the root surface of wetland plants using the scanning ion-selective electrode technique

Peijnenburg

et al. 2016

Plant Soil

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Background and aims Measuring specific ion fluxes from different regions of the root under practical physiological conditions is crucial for understanding metal uptake mechanisms by plants. Methods We developed and tested a neutral carrierbased liquid-membrane Pb 2+ and Cu 2+ ion selective microelectrode (ISME) to investigate ion-transport processes along the roots of three common wetland plant species. Results The Pb 2+ and Cu 2+ ISME exhibited a Nernstian response with Pb 2+ and Cu 2+ activities as low as 1.0 nM and 1.0 μM in deionized water and simulated soil solution, respectively. Phragmites australis had a region of Cu 2+ release for approximately the first 200 μm, while it exhibited Pb 2+ and Cd 2+ outward net flux up to the first 500 μm. Although in older sections of the root of Phragmites australis there were areas of influx of Cu 2+ , Pb 2+ and Cd 2+ , the overall influx was much smaller than that of Typha latifolia or Canna indica. Such a reduced uptake and/or an increased efflux of metal ions across the root-cell plasma-membrane might explain the higher resistance of Phragmites australis to metals, at least in part. Conclusions The Pb 2+ and Cu 2+ ISMEs are shown to permit detailed investigation of heavy-metal ion transport in plant roots, especially for plants used for phytoremediation.

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Section: Discussioncontrasting

confidence: 41%

Section: Resultsmentioning

confidence: 99%

“…Only electrodes with Nernstian slopes >25 mV per decade were used. Details on fabrication and calibration of ISMEs have been described previously (Li et al 2012;Ma et al 2010). …”

Section: Construction and Characterization Of Pb 2+ And Cu 2+ Ismesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Determining the fluxes of ions (Pb2+, Cu2+ and Cd2+) at the root surface of wetland plants using the scanning ion-selective electrode technique

Peijnenburg

et al. 2016

Plant Soil

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“…Each completely digested sample was diluted with ultra pure water to 5 mL for the quantification of Pb and Zn using ICP-MS (Agilent 7500i, Agilent Technologies Co. Ltd, USA). GBW07605 tea leaves (State Bureau of Technical Supervision, People's Republic of China) were employed as certified reference materials for metal analysis to ensure internal quality assurance/quality control (QA/QC) practices (Li et al 2012). The spike recovery of target elements, as tested by three individual spiking experiments, was restricted within 93.5-104.7 % for Pb and 95.4-106.5 % for Zn at the level of 5 ng g -1 .…”

Section: Metal Concentrations In Plant Tissuesmentioning

confidence: 99%

Toxic effects of benzo[a]pyrene (Bap) and Aroclor1254 on embryogenesis, larval growth, survival and metamorphosis of the bivalve Meretrix meretrix

et al. 2012

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Lead (Pb) and zinc (Zn) are two typical metal contaminants with high levels in both seawater and sediment in the intertidal zones of the Bohai Sea. Suaeda salsa is the pioneer halophyte plant in the intertidal zones of the Bohai Sea. In the present work, the short (1 week) and long term (1 month) toxicological effects of environmentally relevant concentrations of Pb and Zn were characterized in S. salsa using NMR-based metabolomics combined with antioxidant enzyme activities. After metal exposure for 1 week, no significant metabolic responses were detected in root tissues of S. salsa. The significant metabolic responses included the increase of isocaproate, glucose and fructose, and decrease of malate, citrate and sucrose in root tissues of S. salsa exposed to Pb for 1 month. The increased phosphocholine and betaine, and decreased choline were uniquely found in Zn-exposed samples. The metabolic changes including decreased malate, citrate and sucrose were detected in both Pb and Zn-exposed groups. These metabolic biomarkers revealed that both Pb and Zn exposures could induce osmotic stress and disturbances in energy metabolism in S. salsa after exposures for 1 month. Overall, this work demonstrates that metabolomics can be used to elucidate toxicological effects of environmentally relevant metal contaminants using halophyte S. salsa as the bioindicator.

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Cadmium Bioavailability, Uptake, Toxicity and Detoxification in Soil-Plant System

Shahid

Dumat

Khalid

et al. 2016

Reviews of Environmental Contamination and Toxicology

206

175

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This review summarizes the findings of the most recent studies, published from 2000 to 2016, which focus on the biogeochemical behavior of Cd in soil-plant systems and its impact on the ecosystem. For animals and people not subjected to a Cd-contaminated environment, consumption of Cd contaminated food (vegetables, cereals, pulses and legumes) is the main source of Cd exposure. As Cd does not have any known biological function, and can further cause serious deleterious effects both in plants and mammalian consumers, cycling of Cd within the soil-plant system is of high global relevance.The main source of Cd in soil is that which originates as emissions from various industrial processes. Within soil, Cd occurs in various chemical forms which differ greatly with respect to their lability and phytoavailability. Cadmium has a high phytoaccumulation index because of its low adsorption coefficient and high soil-plant mobility and thereby may enter the food chain. Plant uptake of Cd is believed to occur mainly via roots by specific and non-specific transporters of essential nutrients, as no Cd-specific transporter has yet been identified. Within plants, Cd causes phytotoxicity by decreasing nutrient uptake, inhibiting photosynthesis, plant growth and respiration, inducing lipid peroxidation and altering the antioxidant system and functioning of membranes. Plants tackle Cd toxicity via different defense strategies such as decreased Cd uptake or sequestration into vacuoles. In addition, various antioxidants combat Cd-induced overproduction of ROS. Other mechanisms involve the induction of phytochelatins, glutathione and salicylic acid.

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Pathways of cadmium fluxes in the root of the halophyte Suaeda salsa

Cited by 79 publications

References 33 publications

Determining the fluxes of ions (Pb2+, Cu2+ and Cd2+) at the root surface of wetland plants using the scanning ion-selective electrode technique

Determining the fluxes of ions (Pb2+, Cu2+ and Cd2+) at the root surface of wetland plants using the scanning ion-selective electrode technique

Toxic effects of benzo[a]pyrene (Bap) and Aroclor1254 on embryogenesis, larval growth, survival and metamorphosis of the bivalve Meretrix meretrix

Cadmium Bioavailability, Uptake, Toxicity and Detoxification in Soil-Plant System

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