Zeta potential at the root surfaces of rice characterized by streaming potential measurements

Li, Zhongyi; Liu, Yuan; Zheng, Yunyun; Xu, Runsheng

doi:10.1007/s11104-014-2259-6

Cited by 36 publications

(16 citation statements)

References 40 publications

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“…After adsorption of Cu(II) and Cd(II), the roots were washed with distilled water three times and then air-dried. A streaming potential apparatus was used to measure the zeta potential of soybean roots with and without adsorbed Cu(II) and Cd(II)47. The air-dried soybean roots were cut to a length of 2 cm, and 0.25 g of the roots were horizontally loaded into a sample cell.…”

Section: Methodsmentioning

confidence: 99%

Relative abundance of chemical forms of Cu(II) and Cd(II) on soybean roots as influenced by pH, cations and organic acids

Zhou

Liu

et al. 2016

Sci Rep

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Little information is available on chemical forms of heavy metals on integrate plant roots. KNO3 (1 M), 0.05M EDTA at pH6 and 0.01 M HCl were used sequentially to extract the exchangeable, complexed and precipitated forms of Cu(II) and Cd(II) from soybean roots and then to investigate chemical form distribution of Cu(II) and Cd(II) on soybean roots. Cu(II) and Cd(II) adsorbed on soybean roots were mainly exchangeable form, followed by complexed form, while their precipitated forms were very low under acidic conditions. Soybean roots had a higher adsorption affinity to Cu(II) than Cd(II), leading to higher toxic of Cu(II) than Cd(II). An increase in solution pH increased negative charge on soybean and thus increased exchangeable Cu(II) and Cd(II) on the roots. Ca2+, Mg2+ and NH4+ reduced exchangeable Cu(II) and Cd(II) levels on soybean roots and these cations showed greater effects on Cd(II) than Cu(II) due to greater adsorption affinity of the roots to Cu(II) than Cd(II). L-malic and citric acids decreased exchangeable and complexed Cu(II) on soybean roots. In conclusion, Cu(II) and Cd(II) mainly existed as exchangeable and complexed forms on soybean roots. Ca2+ and Mg2+ cations and citric and L-malic acids can potentially alleviate Cu(II) and Cd(II) toxicity to plants.

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Section: Methodsmentioning

confidence: 99%

Relative abundance of chemical forms of Cu(II) and Cd(II) on soybean roots as influenced by pH, cations and organic acids

Zhou

Liu

et al. 2016

Sci Rep

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“…These and subsequent studies regarding ion toxicity and related surface electric potential have provided further evidence that certain surface potentials can be linked to physiological states and processes, e.g., ion availability and uptake (Wang et al, 2009(Wang et al, , 2011(Wang et al, , 2013Kinraide and Wang, 2010). Li et al (2015) estimated the electric potential at riceroot surfaces of macroscopic root segments using measurements of the electrokinetic zeta-potential. The zeta-potential is the experimentally accessible electric potential at a distance from the surface where slipping in the electrolyte occurs upon a flow-driving pressure gradient.…”

Section: Polarization Of Biomattermentioning

confidence: 99%

“…Electrical methods, including both tomographic and spectroscopic approaches, are gaining importance for root research due to their universal applicability at different scales and the recognized potential to provide pertinent information on root systems via their electrical properties. Advances in measurement accuracy (Zimmermann et al, 2008) and largescale deployments (e.g., Johnson et al, 2012;Loke et al, 2013) allow imaging studies with high spatial and temporal resolution at both laboratory and field scales (see, e.g., Kemna et al, 2012;Singha et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Multi-frequency electrical impedance tomography as a non-invasive tool to characterize and monitor crop root systems

Weigand

Kemna

2017

Biogeosciences

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Abstract. A better understanding of root–soil interactions and associated processes is essential in achieving progress in crop breeding and management, prompting the need for high-resolution and non-destructive characterization methods. To date, such methods are still lacking or restricted by technical constraints, in particular the charactization and monitoring of root growth and function in the field. A promising technique in this respect is electrical impedance tomography (EIT), which utilizes low-frequency (< 1 kHz)- electrical conduction- and polarization properties in an imaging framework. It is well established that cells and cell clusters exhibit an electrical polarization response in alternating electric-current fields due to electrical double layers which form at cell membranes. This double layer is directly related to the electrical surface properties of the membrane, which in turn are influenced by nutrient dynamics (fluxes and concentrations on both sides of the membranes). Therefore, it can be assumed that the electrical polarization properties of roots are inherently related to ion uptake and translocation processes in the root systems. We hereby propose broadband (mHz to hundreds of Hz) multi-frequency EIT as a non-invasive methodological approach for the monitoring and physiological, i.e., functional, characterization of crop root systems. The approach combines the spatial-resolution capability of an imaging method with the diagnostic potential of electrical-impedance spectroscopy. The capability of multi-frequency EIT to characterize and monitor crop root systems was investigated in a rhizotron laboratory experiment, in which the root system of oilseed plants was monitored in a water–filled rhizotron, that is, in a nutrient-deprived environment. We found a low-frequency polarization response of the root system, which enabled the successful delineation of its spatial extension. The magnitude of the overall polarization response decreased along with the physiological decay of the root system due to the stress situation. Spectral polarization parameters, as derived from a pixel-based Debye decomposition analysis of the multi-frequency imaging results, reveal systematic changes in the spatial and spectral electrical response of the root system. In particular, quantified mean relaxation times (of the order of 10 ms) indicate changes in the length scales on which the polarization processes took place in the root system, as a response to the prolonged induced stress situation. Our results demonstrate that broadband EIT is a capable, non-invasive method to image root system extension as well as to monitor changes associated with the root physiological processes. Given its applicability on both laboratory and field scales, our results suggest an enormous potential of the method for the structural and functional imaging of root systems for various applications. This particularly holds for the field scale, where corresponding methods are highly desired but to date are lacking.

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“…Previous studies revealed that the types and concentrations of cations in soil solution have significant influence on the potential of soil surface and its electrochemical properties [9,10]. In the soil-water-electrolyze system, as a kind of particular clay soil that contains a certain amount of montmorillonite and carries negative charges, the surface of clay particles is absorbed by the cations, so that a very high ion concentration is induced surrounding it [11].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Swelling Behavior of Expansive Soil at Different Depths under Unidirectional Seepage

She

Yao

et al. 2019

Applied Sciences

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The swelling properties of expansive soil at different depths were investigated by the laboratory model test. It was experimentally found that the swelling deformation of different expansive soil layers was obviously different under unidirectional seepage. Pore solution collection boxes were designed to collect the pore solution of different soil layer interfaces during the saturation process. Cation concentration tests were then used to analyze the migration regulation of cations in these soil layers. Results showed that the divalent cations in the surface soil layer migrated downward along with water molecules and aggregated around clay particles to form the electrical environment in expansive soil. Additionally, swelling tests were performed to compare with their initial values to research the variation of swelling behavior of expansive soil at different depths after completion of the model test. It was observed that the swelling potential of the surface expansive soil layer at a depth of 0–30 mm was released while that of the middle and bottom ones at depths of 90–120 mm and 180–210 mm was inhibited. An analysis on the above results was used to clarify the mechanism controlling the swelling difference of different expansive soil layers. This swelling difference may be explained by the joint effect of two factors that can be treated as an electric charge effect, namely (i) the modification effect, (ii) the electrical environment.

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Zeta potential at the root surfaces of rice characterized by streaming potential measurements

Cited by 36 publications

References 40 publications

Relative abundance of chemical forms of Cu(II) and Cd(II) on soybean roots as influenced by pH, cations and organic acids

Relative abundance of chemical forms of Cu(II) and Cd(II) on soybean roots as influenced by pH, cations and organic acids

Multi-frequency electrical impedance tomography as a non-invasive tool to characterize and monitor crop root systems

Experimental Study on the Swelling Behavior of Expansive Soil at Different Depths under Unidirectional Seepage

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