Predicting molybdenum toxicity to higher plants: Influence of soil properties

McGrath, Steve P.; Micó, C.; Curdy, Romuald; Zhao, Fang‐Jie

doi:10.1016/j.envpol.2010.06.027

Cited by 65 publications

(41 citation statements)

References 30 publications

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“…With increasing soil pH the concentration of MoO 4 2-ions in the soil solution increases. As Lindsay (1979) and McGrath et al (2010a) reported, for each unit of the pH value above 3.0, the concentration of molybdate ions can increase even one hundred times. Enhancement of Mo mobility in soil at high pH values is caused by an increase of free negative charges on soil colloids, stronger competition between molybdates and hydroxyl anions for adsorption sites, as well as by lower activity of Al and Fe oxides, which is the cause of reducing the amount of free positive sites able to adsorb molybdenum (Jarrell andDawson 1978, Jiang et al 2015).…”

Section: Resultsmentioning

confidence: 94%

Prediction of molybdenum availability to plants in differentiated soil conditions

Rutkowska¹,

Szulc²,

Spychaj-Fabisiak³

et al. 2017

PLANT SOIL ENVIRON

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The aim of the study was to assess of plant available molybdenum (Mo) resources in the solutions of soils as well as to evaluate the effects of selected soil properties on changes of the Mo concentration in the soil solution. Sixty-two soil samples were investigated. The soil solutions were obtained by modified vacuum displacement method. The results showed that Mo concentrations in the soil solutions were much differentiated, ranging from 0.002 to approximately 0.100 µmol/L. Positive correlations were found between soil solution Mo concentration and soil pH as well as the contents of available phosphorous and organic carbon in soil. At the same time, Mo concentration was higher in the soil solutions obtained from soils with larger amounts of soil particles with diameter lesser than<br /> 0.02 mm. Among the analysed soil parameters in this study, soil pH is the most important factor that influences the Mo concentration in soil solution. Studies have shown that in acid sandy soils the amount of molybdenum found in the soil solution is too small to cover the nutritional requirements of the plants. This indicates the need of fertilization with this element. Regular liming of soils and fertilization with phosphorus can improve the availability of molybdenum to plants.

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Section: Resultsmentioning

confidence: 94%

Prediction of molybdenum availability to plants in differentiated soil conditions

Rutkowska¹,

Szulc²,

Spychaj-Fabisiak³

et al. 2017

PLANT SOIL ENVIRON

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“…As a heavy metal, high concentrations will damage plant cells. McGrath et al (2010) reported that high Mo concentrations decreased the shoots and yields in tomato, oilseed rape, red clover, and ryegrass. It was shown in our results that Mo reduced/inhibited the hypocotyl length, and shoot and root growth.…”

Section: Discussionmentioning

confidence: 99%

Proline partially overcomes excess molybdenum toxicity in cabbage seedlings grown in vitro

Jutamas¹,

Huang²,

Lee³

et al. 2013

Genet. Mol. Res.

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ABSTRACT. In vitro grown cabbage (Brassica oleracea var. capitata) seedlings exposed to excess molybdenum (Mo) ions exhibited severely reduced plant growth at the cotyledonary stage. Adding 80 mM proline (Pro) to the Mo-treated medium could help 50% seedlings to overcome the toxicity and grow true leaves. Under excess Mo stress, seedlings accumulated blue/purple anthocyanin in their cotyledons and hypocotyls. The anthocyanin content under Mo with 40 mM Pro was 4-fold higher than the control medium, MS with 40 mM Pro. The presence of Pro in the excess-Mo condition reduced chlorophyll a, whereas the chlorophyll b content was much higher than the control media of MS with and without Pro. Moreover, supplementing various concentrations of Pro into the Mo-stressed condition promoted the seedlings with higher antioxidant enzyme activities of superoxide dismutase, ascorbate peroxidate, and catalase. In addition, genes in the anthocyanin biosynthesis and accumulation pathways, phenylalanine ammonia lyase (PAL), chalcone synthase (CHS), flavonone 3-hydroxylase (F3H), leucoanthocyanidin dioxygenase (LDOX), and glutathione-S-transferase (GST), were all upregulated. Our study indicated that, under excess Mo stress, the antioxidant activity of cabbage seedlings was induced in an attempt to protect plants from the Mo-induced toxicity and exacerbated growth. Pro, on the other hand, functioned in producing higher antioxidant enzyme activity to partially help recover plant growth.

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“…A regression analysis (log-log basis) revealed that the variation in EC 50 values among soils was, for all endpoints studied, significantly correlated with soil properties such as clay, ammonium oxalate-extractable iron oxides, pH (0.01 M CaCl 2 ), eCEC and organic carbon (Table 3). [25,29,30] Regressions with soil properties were preferentially based on EC 50 values, because EC 50 is a more robust estimate (smaller confidence interval) for effects and is less affected by experimental error compared with the NOEC or EC 10 values.…”

Section: àmentioning

confidence: 99%

“…Studies including NaCl testing with plants and microorganisms suggested direct salt stress to be of limited importance at a Na 2 MoO 4 dose below 1000 mg added Mo kg À1 . [5,29] No literature or test data were available on change in molybdate availability and toxicity through the decrease in concentration of competing ions in the soil solution after leaching excess ions from the soil. However, data for Cu, Ni and Pb show a median leaching factor (i.e.…”

Section: àmentioning

confidence: 99%

“…In three soils, toxicity was also tested after 6 and 11 months' equilibration after spiking with Na 2 MoO 4 in order to assess changes in soil toxicity with time. [5,[24][25][26][27][28][29][30] The current paper presents the implementation of these data and bioavailability correction models in the effects assessment and the derivation of ecological standards for Mo in soil. This assessment covers direct toxicity only to soil organisms, i.e.…”

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Derivation of ecological standards for risk assessment of molybdate in soil

Oorts¹,

Smolders

McGrath

et al. 2016

Environ. Chem.

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Environmental context. In order to assess the potential risks of elevated molybdenum concentrations in soil due to anthropogenic activities, toxicity thresholds must be known and environmental criteria defined. Setting such criteria for metals is not straightforward because of varying natural background concentrations and differences in toxicity between typical laboratory and field conditions and across soil types. Toxicity data and models were derived that account for these parameters so that soil quality criteria can be derived based on total molybdenum concentrations in soil.Abstract. An extensive testing programme on the toxicity of sodium molybdate dihydrate in soil was initiated to comply with the European REACH Regulation. The molybdate toxicity was assayed with 11 different bioassays, 10 different soils, soil chemical studies on aging reactions, and toxicity tests before and after 1-year equilibration in field conditions. Differences in molybdate toxicity among soils were best explained by soil pH and clay content. A correction factor of 2.0 was selected to account for the difference in molybdate toxicity between laboratory and field conditions due to leaching and aging processes. Toxicity thresholds were determined as the HC 5-50 (median hazardous concentration for 5 % of the species, i.e. median 95 % protection level) derived from the species sensitivity distribution of ecotoxicity data after bioavailability corrections. Uncertainty analysis illustrated that the HC 5-50 provides a robust and ecologically relevant predicted no-effect concentration (PNEC) for risk characterisation. The 10th and 90th percentiles for site-specific PNEC values in European agricultural soil are 10.7 and 168 mg Mo kg À1 dry weight respectively based on a large survey of metal concentrations and soil properties in arable land soils. Total soil Mo concentrations in these soils are below corresponding PNEC values at most locations, suggesting no regional risks of molybdate to soil organisms at this scale. The information presented can be used in the EU risk-assessment framework as well as for national and international regulatory purposes for the setting of soil quality criteria based on total molybdenum concentrations, soil pH and clay content.

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Predicting molybdenum toxicity to higher plants: Influence of soil properties

Cited by 65 publications

References 30 publications

Prediction of molybdenum availability to plants in differentiated soil conditions

Prediction of molybdenum availability to plants in differentiated soil conditions

Proline partially overcomes excess molybdenum toxicity in cabbage seedlings grown in vitro

Derivation of ecological standards for risk assessment of molybdate in soil

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