A Comparison of the Uptake and Translocation of Some Organic Herbicides and a Systemic Fungicide by Barley

Shone, M. G. T.; Bartlett, B. O.; Wood, Ann V.

doi:10.1093/jxb/25.2.401

Cited by 91 publications

(43 citation statements)

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“…In 1974, Shone et al [35] introduced the transpiration stream concentration factor TSCF, which is the ratio of the concentration in xylem to that in external solution and is a measure for translocation upwards. Briggs et al fitted the characteristic bellshaped (Gaussian) curve to the log K OW [16]:…”

Section: Validity Of the Modelmentioning

confidence: 99%

Fruit Tree model for uptake of organic compounds from soil and air†

Trapp

2007

SAR and QSAR in Environmental Research

141

136

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Section: Validity Of the Modelmentioning

confidence: 99%

Fruit Tree model for uptake of organic compounds from soil and air†

Trapp

2007

SAR and QSAR in Environmental Research

141

136

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“…[30] Trinitrotoluene partition between root and solution at three initial concentrations (5, 50, and 500 mM TNT) with time is shown in Fig. [11,30,31] For this factor, it is appropriate to use the actual concentration in solution, even if TNT depletion had occurred. It is also convenient to compare the TNT concentration in the root tissue with that in the external solution, using the Root Concentration Factor which has been widely applied to this research area.…”

Section: Nonconstant Hydroponic Experiments (Nhe)mentioning

confidence: 99%

Uptake and Phytotoxicity of TNT in Onion Plant

Kim¹,

Drew²,

Çorapçıoğlu³

2004

Journal of Environmental Science and Health, Part A

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The uptake of 14C-2,4,6-trinitrotoluene (TNT) in hydroponics was studied using onion plants. Of the total TNT mass (5 microM concentration), 75% was in the roots, 4.4% in the leaves, and 21% in the external solution at 2 days. The percent distribution in roots was lower with higher concentration in the external solution, but in leaves it was comparable at all concentrations (5-500 microM). Root concentration factor (RCF) in hydroponics was more than 85 in constant hydroponic experiment (CHE) at 5 microM and 150 in nonconstant hydroponic experiment (NHE) at 5 microM. The maximum RCF values in the hydroponic system were greater with lower solution concentration. Transpiration stream concentration factor (TSCF) values in the present study (NHE only: 0.31-0.56) were relatively similar to the values with predicted values (0.43-0.78), increasing with higher external TNT concentration. All predicted values for RCF and TSCF were derived in the literature from equations using logKow (log10 octanol-water partition coefficient). For phytotoxicity tested in hydroponics and wet paper method, 500 microM was toxic to onion plant, 50 microM was nontoxic for plant growth but limited the transpiration rate, and 5 microM was nontoxic as control.

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“…Generally, uptake is rather rapid until equilibrium is reached. The equilibrium has been described by the root concentration factor (RCF):1 When uptake is from aqueous solution (eg in experiments using hydroponic solution as growth medium), the RCF of non‐electrolytes increases with log K OW ; K OW is the partition coefficient between octanol and water. This dependency upon the log K OW is explained by the lipophilic sorption of the compound to plant lipids.…”

Section: Introductionmentioning

confidence: 99%

Modelling uptake into roots and subsequent translocation of neutral and ionisable organic compounds

Trapp

2000

Pest Manag. Sci.

263

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A study on uptake of neutral and dissociating organic compounds from soil solution into roots, and their subsequent translocation, was undertaken using model simulations. The model approach combines the processes of lipophilic sorption, electrochemical interactions, ion trap, advection in xylem and dilution by growth. It needs as input data, apart from plant properties, log K OW , pK a and the valency number of the compound, and pH and chemical concentration in the soil solution. Equilibrium and dynamic (steady-state) models were tested against measured data from several authors, including non-electrolytes as well as weakly acidic and weakly basic compounds. Deviations from the measured values led to further development of the model approach: sorption in the central cylinder may explain the small transpiration stream concentration factor of lipophilic compounds. For non-electrolytes, the model predicted uptake and translocation with high accuracy. For acids and bases, the tendency of the results was satisfactory. The dynamic model and the equilibrium approach gave similar results for the root concentration factor. The calculation of the transpiration stream concentration factor was more accurate with the dynamic model, but still gave deviations up to factor of ten or more. The dominating process for monovalent weak electrolytes was found to be the ion trap effect.

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A Comparison of the Uptake and Translocation of Some Organic Herbicides and a Systemic Fungicide by Barley

Cited by 91 publications

References 0 publications

Fruit Tree model for uptake of organic compounds from soil and air†

Fruit Tree model for uptake of organic compounds from soil and air†

Uptake and Phytotoxicity of TNT in Onion Plant

Modelling uptake into roots and subsequent translocation of neutral and ionisable organic compounds

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