Relative effectiveness of calcium and magnesium in the alleviation of rhizotoxicity in wheat induced by copper, zinc, aluminum, sodium, and low pH

Kinraide, Thomas B.; Pedler, Judith F.; Parker, David R.

doi:10.1023/b:plso.0000020972.18777.99

Cited by 126 publications

(108 citation statements)

References 14 publications

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“…Thakali et al (2006a, b) did not find protective 413 effects due to ions other than H + when applying a BLM to the subset of non-414 calcareous soils, other than an Mg effect on potential nitrification. Protective effects 415 of Mg 2+ and Ca 2+ against Cu toxicity have been previously observed, for example by 416 Kinraide et al (2004) and Luo et al (2008) for root elongation of wheat (Triticum 417 aestivum) in nutrient solutions. On the other hand, Steenbergen et al (2005) found 418 that Mg 2+ and Ca 2+ did not protect the earthworm A. caliginosa against the acute 419 toxicity of Cu 2+ but appeared to contribute to the toxicity.…”

Section: Investigation 393mentioning

confidence: 89%

Modelling the effects of copper on soil organisms and processes using the free ion approach: Towards a multi-species toxicity model

Lofts

Criel

Janssen

et al. 2013

Environmental Pollution

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The free ion approach has been previously used to calculate critical limit 22 concentrations for soil metals based on point estimates of toxicity. Here, the approach 23 was applied to dose-response data for copper effects on seven biological endpoints in 24 each of 19 European soils. The approach was applied using the concept of an effective 25 dose, comprising a function of the concentrations of free copper and 'protective' 26 major cations, including H + . A significant influence of H + on the toxicity of Cu 2+ was 27 found, while the effects of other cations were inconsistent. The model could be 28 generalised by forcing the effect of H + and the slope of the dose-response relationship 29 to be equal for all endpoints. This suggests the possibility of a general bioavailability 30 model for copper effects on organisms. Furthermore, the possibility of such a model 31 could be explored for other cationic metals such as nickel, zinc, cadmium and lead. 32 33

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Section: Investigation 393mentioning

confidence: 89%

Modelling the effects of copper on soil organisms and processes using the free ion approach: Towards a multi-species toxicity model

Lofts

Criel

Janssen

et al. 2013

Environmental Pollution

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“…Ca is an important signaling component in biotic and abiotic stresses, and disturbances in its content have been associated with toxicity by Cd, zinc (Zn), copper (Cu), or aluminum (Al; Kinraide et al, 2004), although the mechanisms involved are not well known. The growth of pea plants in full-nutrient solutions containing 50 mM CdCl 2 for 15 d produced an accumulation of Cd in the leaves of about 13 mg g 21 dry weight (Supplemental Table S1).…”

Section: Effects Of CD On Macronutrient and Micronutrient Content Of mentioning

confidence: 99%

Cellular Response of Pea Plants to Cadmium Toxicity: Cross Talk between Reactive Oxygen Species, Nitric Oxide, and Calcium

et al. 2009

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Cadmium (Cd) toxicity has been widely studied in different plant species; however, the mechanism involved in its toxicity as well as the cell response against the metal have not been well established. In this work, using pea (Pisum sativum) plants, we studied the effect of Cd on antioxidants, reactive oxygen species (ROS), and nitric oxide (NO) metabolism of leaves using different cellular, molecular, and biochemical approaches. The growth of pea plants with 50 mM CdCl 2 affected differentially the expression of superoxide dismutase (SOD) isozymes at both transcriptional and posttranscriptional levels, giving rise to a SOD activity reduction. The copper/zinc-SOD down-regulation was apparently due to the calcium (Ca) deficiency induced by the heavy metal. In these circumstances, the overproduction of the ROS hydrogen peroxide and superoxide could be observed in vivo by confocal laser microscopy, mainly associated with vascular tissue, epidermis, and mesophyll cells, and the production of superoxide radicals was prevented by exogenous Ca. On the other hand, the NO synthase-dependent NO production was strongly depressed by Cd, and treatment with Ca prevented this effect. Under these conditions, the pathogen-related proteins PrP4A and chitinase and the heat shock protein 71.2, were up-regulated, probably to protect cells against damages induced by Cd. The regulation of these proteins could be mediated by jasmonic acid and ethylene, whose contents increased by Cd treatment. A model is proposed for the cellular response to long-term Cd exposure consisting of cross talk between Ca, ROS, and NO.

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“…In some species such as soybean and rice bean, Mg at micromolar concentrations is able to alleviate Al toxicity (Silva et al, 2001a;Yang et al, 2007), but millimolar concentrations are required to have the alleviative effects in other species such as wheat and rice (Ryan et al, 1997;Watanabe and Okada, 2005). The latter has been attributed to increased ionic strength of the solutions (Noble and Sumner, 1988), reduction in Al saturation at the apoplastic exchange sites (Grauer and Horst, 1992), and decreased Al activity at the root cell plasma membrane surface (Kinraide, 2003;Kinraide et al, 2004). Al toxicity is caused by its binding to different cellular components including cell wall and plasma membrane (Ma, 2000).…”

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confidence: 99%

Up-Regulation of a Magnesium Transporter GeneOsMGT1Is Required for Conferring Aluminum Tolerance in Rice

Yamaji²,

et al. 2012

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Magnesium (Mg)-mediated alleviation of aluminum (Al) toxicity has been observed in a number of plant species, but the mechanisms underlying the alleviation are still poorly understood. When a putative rice (Oryza sativa) Mg transporter gene, Oryza sativa MAGNESIUM TRANSPORTER1 (OsMGT1), was knocked out, the tolerance to Al, but not to cadmium and lanthanum, was decreased. However, this inhibition could be rescued by addition of 10 mM Mg, but not by the same concentration of barium or strontium. OsMGT1 was expressed in both the roots and shoots in the absence of Al, but the expression only in the roots was rapidly up-regulated by Al. Furthermore, the expression did not respond to low pH and other metals including cadmium and lanthanum, and was regulated by an Al-responsive transcription factor, AL RESISTANCE TRANSCRIPTION FACTOR1. An investigation of subcellular localization showed that OsMGT1 was localized to the plasma membrane. A short-term (30 min) uptake experiment with stable isotope 25 Mg showed that knockout of OsMGT1 resulted in decreased Mg uptake, but that the uptake in the wild type was enhanced by Al. Mg concentration in the cell sap of the root tips was also increased in the wild-type rice, but not in the knockout lines in the presence of Al. A microarray analysis showed that transcripts of genes related to stress were more up-and down-regulated in the knockout lines. Taken together, our results indicate that OsMGT1 is a transporter for Mg uptake in the roots and that up-regulation of this gene is required for conferring Al tolerance in rice by increasing Mg concentration in the cell.

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Relative effectiveness of calcium and magnesium in the alleviation of rhizotoxicity in wheat induced by copper, zinc, aluminum, sodium, and low pH

Cited by 126 publications

References 14 publications

Modelling the effects of copper on soil organisms and processes using the free ion approach: Towards a multi-species toxicity model

Modelling the effects of copper on soil organisms and processes using the free ion approach: Towards a multi-species toxicity model

Cellular Response of Pea Plants to Cadmium Toxicity: Cross Talk between Reactive Oxygen Species, Nitric Oxide, and Calcium

Up-Regulation of a Magnesium Transporter GeneOsMGT1Is Required for Conferring Aluminum Tolerance in Rice

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