Cadmium impairs iron homeostasis in Arabidopsis thaliana by increasing the polysaccharide contents and the iron-binding capacity of root cell walls

Xu, Shan; Lin, Si Zu; Lai, Zhong Xiong

doi:10.1007/s11104-015-2443-3

Cited by 61 publications

(21 citation statements)

References 76 publications

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“…One possible mechanism underlying these disturbances is cell wall remodeling. In a study using A. thaliana , leaf chlorosis was observed after Cd exposure mainly as a result of Cd-induced Fe deficiency in the shoots ( Xu et al, 2015 ). Upon Cd exposure, the pectin and hemicellulose content of the root cell walls increased, leading to a major retention of Fe in the roots and hence a decrease of the Fe concentration in the shoots.…”

Section: Cadmium Impairs Proper Nutrient Homeostasismentioning

confidence: 99%

Reciprocal Interactions between Cadmium-Induced Cell Wall Responses and Oxidative Stress in Plants

et al. 2017

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Cadmium (Cd) pollution renders many soils across the world unsuited or unsafe for food- or feed-orientated agriculture. The main mechanism of Cd phytotoxicity is the induction of oxidative stress, amongst others through the depletion of glutathione. Oxidative stress can damage lipids, proteins, and nucleic acids, leading to growth inhibition or even cell death. The plant cell has a variety of tools to defend itself against Cd stress. First and foremost, cell walls might prevent Cd from entering and damaging the protoplast. Both the primary and secondary cell wall have an array of defensive mechanisms that can be adapted to cope with Cd. Pectin, which contains most of the negative charges within the primary cell wall, can sequester Cd very effectively. In the secondary cell wall, lignification can serve to immobilize Cd and create a tougher barrier for entry. Changes in cell wall composition are, however, dependent on nutrients and conversely might affect their uptake. Additionally, the role of ascorbate (AsA) as most important apoplastic antioxidant is of considerable interest, due to the fact that oxidative stress is a major mechanism underlying Cd toxicity, and that AsA biosynthesis shares several links with cell wall construction. In this review, modifications of the plant cell wall in response to Cd exposure are discussed. Focus lies on pectin in the primary cell wall, lignification in the secondary cell wall and the importance of AsA in the apoplast. Regarding lignification, we attempt to answer the question whether increased lignification is merely a consequence of Cd toxicity, or rather an elicited defense response. We propose a model for lignification as defense response, with a central role for hydrogen peroxide as substrate and signaling molecule.

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Section: Cadmium Impairs Proper Nutrient Homeostasismentioning

confidence: 99%

Reciprocal Interactions between Cadmium-Induced Cell Wall Responses and Oxidative Stress in Plants

et al. 2017

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“…The endogenous levels of NO in roots were visualized using the fluorescent probe diaminofluorescein-FM diacetate (DAF-FM DA) and epifluorescence microscopy ( Sun et al , 2014 ; Xu et al , 2015 ). Briefly, root tips (0–10mm) were loaded with 10 μM DAF-FM DA in 20mM HEPES-NaOH buffer (pH 7.4) for 20min, washed three times with fresh buffer, and observed under an epifluorescence microscope.…”

Section: Methodsmentioning

confidence: 99%

Decreasing methylation of pectin caused by nitric oxide leads to higher aluminium binding in cell walls and greater aluminium sensitivity of wheat roots

Sun

Yan

et al. 2015

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“…Iron deficiency is a well-known consequence of metal toxicity [e.g. Cd (Xu et al, 2015 )] and seems to increase ethylene sensitivity (García et al, 2010 ), which potentially affects metal-induced responses related to ethylene as well. It has been shown that nutrient stress—either a reduced or increased availability—affects ethylene biosynthesis and perception in plants via the induction of an oxidative burst (Iqbal et al, 2013a ), again highlighting the link between ethylene and ROS signaling.…”

Section: Crosstalk Between Ethylene and Other Players In The Metal Stmentioning

confidence: 99%

Ethylene and Metal Stress: Small Molecule, Big Impact

et al. 2016

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The phytohormone ethylene is known to mediate a diverse array of signaling processes during abiotic stress in plants. Whereas many reports have demonstrated enhanced ethylene production in metal-exposed plants, the underlying molecular mechanisms are only recently investigated. Increasing evidence supports a role for ethylene in the regulation of plant metal stress responses. Moreover, crosstalk appears to exist between ethylene and the cellular redox balance, nutrients and other phytohormones. This review highlights our current understanding of the key role ethylene plays during responses to metal exposure. Moreover, particular attention is paid to the integration of ethylene within the broad network of plant responses to metal stress.

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Cadmium impairs iron homeostasis in Arabidopsis thaliana by increasing the polysaccharide contents and the iron-binding capacity of root cell walls

Cited by 61 publications

References 76 publications

Reciprocal Interactions between Cadmium-Induced Cell Wall Responses and Oxidative Stress in Plants

Reciprocal Interactions between Cadmium-Induced Cell Wall Responses and Oxidative Stress in Plants

Decreasing methylation of pectin caused by nitric oxide leads to higher aluminium binding in cell walls and greater aluminium sensitivity of wheat roots

Ethylene and Metal Stress: Small Molecule, Big Impact

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