Cadmium accumulation is enhanced by ammonium compared to nitrate in two hyperaccumulators, without affecting speciation

Cheng, Ming; Wang, Peng; Kopittke, Peter M.; Wang, Anan; Sale, P. W. G.; Tang, Caixian

doi:10.1093/jxb/erw270

Cited by 86 publications

(53 citation statements)

References 52 publications

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“…In the region, application of as much as 600-950 kg of only urea during the 9 months growing period of vegetable cultivation is a common practice. On the other hand, nitrogen application, particularly in the form of reduced N, could significantly increase soil heavy metal bioavailability [4,30]. However, it has been reported that application of N-nitrate can significantly reduce heavy metal concentration of plant leaves [9,19].…”

Section: Table 2 Heavy Metal Concentrations (Mg Kg −1 Dw) In Root Andmentioning

confidence: 99%

“…The responses of different plant tissues might be also different for each heavy metal. Reduction in photosynthesis and shoot biomass are common responses of plants to heavy metals [4,25]. Root growth and root length are adversely affected by heavy metals in onion (Allium cepa) and garden cress plants [2].…”

Section: Table 2 Heavy Metal Concentrations (Mg Kg −1 Dw) In Root Andmentioning

confidence: 99%

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Plant growth stage influences heavy metal accumulation in leafy vegetables of garden cress and sweet basil

Souri

Hatamian

Tesfamariam

2019

Chem. Biol. Technol. Agric.

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Background: Contamination of vegetable crops with heavy metals is a great threat to human health. On the other hand, monitoring plant tissue content of heavy metals at different growth stages could have important implications. In this study, shoot and root samples of garden cress and sweet basil were collected from five farms, from heavy metal polluted fields located in Shahre Rey, south of Tehran, Iran, in either young (3 weeks old) or mature (7 weeks old) plants. The concentrations of cadmium (Cd), lead (Pb), nickel (Ni), arsenic (As), chromium (Cr), cobalt (Co), copper (Cu), manganese (Mn) and zinc (Zn) in plant tissues were determined using atomic absorption spectroscopy. In another study, 2 weeks (young) or 6 weeks old (mature) plants of garden cress were subjected to three concentrations of Cd and Pb (0, 5, 10 mg L −1 ) under hydroponic sand culture for 5 days, in which Hoagland formula was used for nutrient solution preparation. Results:The results showed that root concentration of various heavy metals, particularly Cd, As, Ni, Co, Cu, Mn and Zn but not Pb were significantly higher than their shoot concentration in either crop under field sampling. The leaf concentration of some heavy metals was significantly different in seedling and older (mature) plant samples of either crop. Young plant leaves of sweet basil had significantly less Cd, Pb, As and higher Cu than mature plants, whereas young garden cress plants had similar Cd, Pb and higher As and Zn concentrations than mature plants. The Cr, Co, Mn and Zn concentrations were similar in young and mature plants of sweet basil. The Mn, Co, Cr and Ni concentration of young and mature plants of either crop was also similar. The result of hydroponic study showed that young plants of garden cress had higher potential to accumulate lead in shoot and root, particularly in lower (5 mg L −1 ) than higher (10 mg L −1 ) lead concentration; however, root Pb concentration at 10 mg L −1 Pb of nutrient solution showed no difference between young and mature plants. Regarding cadmium, young garden cress plants accumulated higher Cd than mature plants in their shoot, particularly under higher Cd levels (10 rather than 5 mg L −1 ) of nutrient solution; however, a wide difference in root Cd concentration was observed under low (5 mg L −1 ) than higher (10 mg L −1 ) cadmium concentration of nutrient solution. Conclusion:The results of these two studies indicate that despite that young plants have a higher potential for heavy metal uptake and accumulation, the low difference in young and mature plants in the polluted fields may be due to the longer period of plant growth of mature plants that may increase the risk of exposure to polluted air and dust deposition containing high levels of heavy metals.

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Section: Table 2 Heavy Metal Concentrations (Mg Kg −1 Dw) In Root Andmentioning

confidence: 99%

Section: Table 2 Heavy Metal Concentrations (Mg Kg −1 Dw) In Root Andmentioning

confidence: 99%

Plant growth stage influences heavy metal accumulation in leafy vegetables of garden cress and sweet basil

Souri

Hatamian

Tesfamariam

2019

Chem. Biol. Technol. Agric.

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“…In Carpobrotus rossii (Haw.) Schwantes, most of the Cd is bound to sulphur‐containing chelators in different tissues, except for the xylem sap (Cheng et al, ). Among the nonthiol chelators, HM‐chelators have also been detected in several plants.…”

Section: Physiological and Molecular Mechanisms Of Hm Accumulation Inmentioning

confidence: 99%

“…In Carpobrotus rossii (Haw.) Schwantes, most of the Cd is bound to sulphur-containing chelators in different tissues, except for the xylem sap (Cheng et al, 2016 (Cheng et al, 2014;Elobeid, Gobel, Feussner, & Polle, 2012). By HM sequestration in root cell walls, the entry of HMs into the protoplasts can be reduced, thereby alleviating the toxicity of HMs in plant cells.…”

Section: Lópezmentioning

confidence: 99%

Physiological and molecular mechanisms of heavy metal accumulation in nonmycorrhizal versus mycorrhizal plants

Shi

Zhang

Chen

et al. 2018

Plant Cell & Environment

135

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Uptake, translocation, detoxification, and sequestration of heavy metals (HMs) are key processes in plants to deal with excess amounts of HM. Under natural conditions, plant roots often establish ecto‐ and/or arbuscular‐mycorrhizae with their fungal partners, thereby altering HM accumulation in host plants. This review considers the progress in understanding the physiological and molecular mechanisms involved in HM accumulation in nonmycorrhizal versus mycorrhizal plants. In nonmycorrhizal plants, HM ions in the cells can be detoxified with the aid of several chelators. Furthermore, HMs can be sequestered in cell walls, vacuoles, and the Golgi apparatus of plants. The uptake and translocation of HMs are mediated by members of ZIPs, NRAMPs, and HMAs, and HM detoxification and sequestration are mainly modulated by members of ABCs and MTPs in nonmycorrhizal plants. Mycorrhizal‐induced changes in HM accumulation in plants are mainly due to HM sequestration by fungal partners and improvements in the nutritional and antioxidative status of host plants. Furthermore, mycorrhizal fungi can trigger the differential expression of genes involved in HM accumulation in both partners. Understanding the molecular mechanisms that underlie HM accumulation in mycorrhizal plants is crucial for the utilization of fungi and their host plants to remediate HM‐contaminated soils.

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“…Complexation of Cd with S‐ and O‐containing ligands is also of importance in hyperaccumulating species. For example, Cheng et al (2016) examined two hyperaccumulators, Carpobrotus rossii (Haw.) Schwantes and Solanum nigrum L., using bulk XAS and found that the majority of Cd was complexed with S‐containing ligands in all tissues, with the exception of the xylem sap, which contained Cd either as uncomplexed Cd 2+ or complexed to simple organic acids.…”

Section: Determining the Distribution And Speciation Of Trace Metal(lmentioning

confidence: 99%

Synchrotron‐based X‐Ray Approaches for Examining Toxic Trace Metal(loid)s in Soil–Plant Systems

et al. 2017

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Elevated levels of trace metal(loid)s reduce plant growth, both in soils contaminated by industrial activities and in acid agricultural soils. Although the adverse effects of trace metal(loid)s have long been recognized, there remains much unknown both about their behavior in soils, their toxicity to plants, and the mechanisms that plants use to tolerate elevated concentrations. Synchrotronbased approaches are being utilized increasingly in soil-plant systems to examine toxic metal(loid)s. In the present review, brief consideration is given to the theory of synchrotron radiation. Thereafter, we review the use of synchrotron-based approaches for the examination of various trace metal(loid)s in soil-plant systems, including aluminum, chromium, manganese, cobalt, nickel, copper, zinc, arsenic, selenium, and cadmium. Within the context of this review, X-ray absorption spectroscopy (XAS) and X-ray fluorescence microscopy (m-XRF) are of particular interest. These techniques can provide in situ analyses of the distribution and speciation of metal(loid)s in soil-plant systems. The information presented here serves not only to understand the behavior of trace metals in soil-plant systems, but also to provide examples of the potential applications of synchrotron radiation that can be used to advantage in other studies.Synchrotron-based X-Ray Approaches for Examining Toxic Trace Metal(loid)s in Soil-Plant Systems Peter M Kopittke, Peng Wang,* Enzo Lombi, Erica Donner T race metals and metalloids, hereafter referred to as metal(loid)s, are natural components of the geosphere, hydrosphere, biosphere, and atmosphere, but their presence at elevated concentrations can result in toxicity. The importance of elevated trace metals in the environment has long been recognized (e.g., Veitch, 1904). Elevated levels of a range of trace metal(loid)s occur in sites contaminated by mining, industry, and transport. Similarly, acid soils, in which soluble aluminum (Al) and manganese (Mn) are increased, comprise ~3.95 billion ha of the global ice-free land or ~40% of the world's arable land (von Uexküll and Mutert, 1995;Eswaran et al., 1997). These degraded lands may be improved by liming of acid agricultural soils or by burying and landfilling of polluted soil, but the cost of remediation is prohibitive in many cases. As a result, there is a continued interest in understanding the toxic effects of metal(loid)s in the soilplant continuum.Investigation of metal(loid) toxicity requires a multidisciplinary and multitechnique approach. Although many complementary techniques are suitable for the examination of metal(loid)s in soil-plant systems, it is not the intention of this review to compare this multitude of approaches. Rather, the focus of the present review is to consider synchrotron-based approaches, these being some of the few techniques that allow for in situ measurements of metal(loid) distribution and speciation with minimal sample preparation. Of particular interest here is synchrotron-based X-ray fluorescence microscopy (m-XRF...

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Cadmium accumulation is enhanced by ammonium compared to nitrate in two hyperaccumulators, without affecting speciation

Abstract: HighlightSupply of NH4 + compared with NO3 − increased plant Cd uptake, translocation and accumulation in Carpobrotus rossii and Solanum nigrum. Cd-S was the dominant Cd species, with Cd being transported as free ions in xylem.

Cited by 86 publications

References 52 publications

Plant growth stage influences heavy metal accumulation in leafy vegetables of garden cress and sweet basil

Plant growth stage influences heavy metal accumulation in leafy vegetables of garden cress and sweet basil

Physiological and molecular mechanisms of heavy metal accumulation in nonmycorrhizal versus mycorrhizal plants

Synchrotron‐based X‐Ray Approaches for Examining Toxic Trace Metal(loid)s in Soil–Plant Systems

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