Zinc adsorption and desorption characteristics in root cell wall involving zinc hyperaccumulation in Sedum alfredii Hance

Li, Tingqiang; Yang, Xiaoe; Meng, Fei; Lu, Lingli

doi:10.1631/jzus.2007.b0111

Cited by 9 publications

(6 citation statements)

References 23 publications

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“…Changes in the cell wall composition contribute to the trace element tolerance in both excluder and accumulator species, but the affinity of the trace element to the root cell wall tends to be different between them. Trace elements bound to the root cell wall of accumulators remain more available for xylem loading than in excluders or non-accumulator plants ( Li et al, 2007 ).…”

Section: Tolerance Mechanisms Of Grasses To Trace Element Toxicitymentioning

confidence: 99%

Are Grasses Really Useful for the Phytoremediation of Potentially Toxic Trace Elements? A Review

et al. 2021

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The pollution of soil, water, and air by potentially toxic trace elements poses risks to environmental and human health. For this reason, many chemical, physical, and biological processes of remediation have been developed to reduce the (available) trace element concentrations in the environment. Among those technologies, phytoremediation is an environmentally friendly in situ and cost-effective approach to remediate sites with low-to-moderate pollution with trace elements. However, not all species have the potential to be used for phytoremediation of trace element-polluted sites due to their morpho-physiological characteristics and low tolerance to toxicity induced by the trace elements. Grasses are prospective candidates due to their high biomass yields, fast growth, adaptations to infertile soils, and successive shoot regrowth after harvest. A large number of studies evaluating the processes related to the uptake, transport, accumulation, and toxicity of trace elements in grasses assessed for phytoremediation have been conducted. The aim of this review is (i) to synthesize the available information on the mechanisms involved in uptake, transport, accumulation, toxicity, and tolerance to trace elements in grasses; (ii) to identify suitable grasses for trace element phytoextraction, phytostabilization, and phytofiltration; (iii) to describe the main strategies used to improve trace element phytoremediation efficiency by grasses; and (iv) to point out the advantages, disadvantages, and perspectives for the use of grasses for phytoremediation of trace element-polluted soils.

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Section: Tolerance Mechanisms Of Grasses To Trace Element Toxicitymentioning

confidence: 99%

Are Grasses Really Useful for the Phytoremediation of Potentially Toxic Trace Elements? A Review

et al. 2021

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“…The cell-wall binding of cations in the root apoplast can be significant (Marschner 1995) and has been shown to contribute towards heavymetal tolerance in plants (Nishizono et al 1987;Hall 2002;Li et al 2007), whereas enhanced Zn absorption into root cells is a necessary mechanism to achieve Zn hyperaccumulation in the shoots (Lasat et al 1996). However, when Zn binds to the root cellwalls of N. caerulescens, it is unclear what effect this has on Zn uptake into root cells and thus on hyperaccumulation.…”

Section: Introductionmentioning

confidence: 99%

Nitrate nutrition enhances zinc hyperaccumulation in Noccaea caerulescens (Prayon)

2010

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Nitrate fertilization has been shown to increase Zn hyperaccumulation by Noccaea caerulescens (Prayon) (formerly Thlaspi caerulescens). However, it is unknown whether this increased hyperaccumulation is a direct result of NO 3 − nutrition or due to changes in rhizosphere pH as a result of NO 3 − uptake. This paper investigated the mechanism of NO 3 − -enhanced Zn hyperaccumulation in N.caerulescens by assessing the response of Zn uptake to N form and solution pH. Plants were grown in nutrient solution with 300 μM Zn and supplied with either (NH 4 ) 2 SO 4 , NH 4 NO 3 or Ca(NO 3 ) 2 . The solutions were buffered at either pH 4.5 or 6.5. The Zn concentration and content were much higher in shoots of NO 3 − -fed plants than in NH 4 + -fed plants at pH 4.5 and 6.5. The Zn concentration in the shoots was mainly enhanced by NO 3 − , whereas the Zn concentration in the roots was mainly enhanced by pH 6.5. Nitrate increased Zn uptake in the roots at pH 6.5 and increased apoplastic Zn at pH 4.5. Zinc and Ca coincreased and was found co-localized in leaf cells of NO 3 − -fed plants. We conclude that NO 3 − directly enhanced Zn uptake and translocation from roots to shoots in N. caerulescens.

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“…Zinc is largely compartmentalized in root cell wall for both the hyperaccumulating and nonhyperaccumulating populations of S. alfredii . However, in comparison to the nonhyperaccumulating population, the hyperaccumulating population bound Zn more loosely to its root cell wall; thereby, Zn was more readily loaded into the xylem and then translocated to its shoot …”

Section: Zinc Hyperaccumulatorsmentioning

confidence: 94%

“…97 Zinc is largely compartmentalized in root cell wall for both the hyperaccumulating and nonhyperaccumulating populations of S. alfredii. 99 However, in comparison to the nonhyperaccumulating population, the hyperaccumulating population bound Zn more loosely to its root cell wall; thereby, Zn was more readily loaded into the xylem and then translocated to its shoot. 99 At the initial stage of Zn exposure, significantly more Zn is allocated in the stem vascular bundle of the hyperaccumulating population of S. alfredii compared to that of the nonhyperaccumulating population, indicating a faster root-to-shoot Zn translocation in the hyperaccumulating population through the vascular bundle (Figure 3).…”

Section: ■ Zinc Hyperaccumulatorsmentioning

confidence: 99%

“…99 However, in comparison to the nonhyperaccumulating population, the hyperaccumulating population bound Zn more loosely to its root cell wall; thereby, Zn was more readily loaded into the xylem and then translocated to its shoot. 99 At the initial stage of Zn exposure, significantly more Zn is allocated in the stem vascular bundle of the hyperaccumulating population of S. alfredii compared to that of the nonhyperaccumulating population, indicating a faster root-to-shoot Zn translocation in the hyperaccumulating population through the vascular bundle (Figure 3). 100,101 As the exposure time progressed, Zn accumulation in the vascular bundle tended to level off toward saturation, yet that in the stem epidermis of the hyperaccumulating population increased rapidly, leading to high concentrations of Zn in both the vascular bundle and the epidermis.…”

Section: ■ Zinc Hyperaccumulatorsmentioning

confidence: 99%

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Hyperaccumulator Plants from China: A Synthesis of the Current State of Knowledge

Gurajala

et al. 2018

Environ. Sci. Technol.

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217

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Hyperaccumulator plants are the material basis for phytoextraction research and for practical applications in decontaminating polluted soils and industrial wastes. China's high biodiversity and substantial mineral resources make it a global hotspot for hyperaccumulator plant species. Intensive screening efforts over the past 20 years by researchers working in China have led to the discovery of many different hyperaccumulators for a range of elements. In this review, we present the state of knowledge on all currently reported hyperaccumulator species from China, including Cardamine violifolia (selenium, Se), Dicranopteris dichotoma (rare earth elements, REEs), Elsholtzia splendens (copper, Cu), Phytolacca americana (manganese, Mn), Pteris vittata (arsenic, As), Sedum alfredii and Sedum plumbizicola (cadmium/zinc, Cd/Zn). This review covers aspects of the ecophysiology and molecular biology of tolerance and hyperaccumulation for each element. The major scientific advances resulting from the study of hyperaccumulator plants in China are summarized and synthesized.

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Zinc adsorption and desorption characteristics in root cell wall involving zinc hyperaccumulation in Sedum alfredii Hance

Cited by 9 publications

References 23 publications

Are Grasses Really Useful for the Phytoremediation of Potentially Toxic Trace Elements? A Review

Are Grasses Really Useful for the Phytoremediation of Potentially Toxic Trace Elements? A Review

Nitrate nutrition enhances zinc hyperaccumulation in Noccaea caerulescens (Prayon)

Hyperaccumulator Plants from China: A Synthesis of the Current State of Knowledge

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