Indirect monitoring of root activity in soybean cultivars under contrasting moisture regimes by measuring electrical capacitance

Cseresnyés, Imre; Rajkai, Kálmán; Takács, Tünde

doi:10.1007/s11738-016-2149-z

Cited by 28 publications

(36 citation statements)

References 36 publications

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“…Conducting sEIT measurements is a multi-step process (Where EIS measurements form the basis of the tomographic analysis). In this regard they differ in application complexity and ease-of-use from other common approaches that use only one electrode spread for measurements (e.g., Chloupek 1972;Ellis et al 2013;Postic and Doussan 2016;Cseresnyés et al 2016). In this section, the basic principles of measuring electrical properties are presented first, followed by our current understanding of electrical polarization processes in the root-soil continuum.…”

Section: Methodsmentioning

confidence: 99%

“…5 in Thomas et al 2016). While this has been achieved already for studies involving two-electrode capacitance measurements (e.g., Cseresnyés et al 2016) and four-electrode SIP/EIS measurements (e.g., Postic and Doussan 2016), it is challenging for tomographic, broadband four-electrode impedance measurements given the data acquisition and processing demands. Spatial resolution of computed sEIT images might be increased by optimizing electrode locations in relation to the known or expected position of root systems, or specific regions of interest (e.g., Wagner et al 2015), as well as by employing optimized measurement configurations (e.g., Stummer et al 2004;Wilkinson et al 2006;al Hagrey and Petersen 2011).…”

Section: Methodological Considerations For Future Experimental Studiesmentioning

confidence: 99%

“…These methods, long established in the near-surface geophysics community, capture electrical material properties of the subsurface, or laboratory samples, which can then be related to geophysical properties such as temperature (e.g., Sen and Goode 1992), salinity (e.g., Rhoades et al 1989), porosity/soil water content (e.g., Archie 1942;Oberdörster et al 2010;Whalley et al 2017), clay content (e.g., Breede et al 2012), and even certain root parameters (e.g., Chloupek 1972;Dalton 1995;Cseresnyés et al 2013;Wu et al 2017, and references therein). It has also been recognized that electrical methods can not only be used to characterize structural, but also functional properties of root systems (e.g., Dalton 1995;Cseresnyés et al 2014Cseresnyés et al , 2016.…”

Section: Introductionmentioning

confidence: 99%

“…Electrical polarization measurements have been conducted on biomatter for several decades now (e.g., Schwan 1957). Capacitance measurements focusing on root systems were first reported by Chloupek (1972) and Chloupek (1976), and multiple studies have been conducted since (for recent overviews, see Heřmanská et al 2015;Cseresnyés et al 2016). Also, a few studies measured multi-frequency capacitance or polarization signatures (e.g., Ozier-Lafontaine and Bajazet 2005; Repo et al 2014).…”

Section: Introductionmentioning

confidence: 99%

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Imaging and functional characterization of crop root systems using spectroscopic electrical impedance measurements

Weigand

Kemna

2018

Plant Soil

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Background and aims Non-or minimally invasive methods are urgently needed to characterize and monitor crop root systems to foster progress in phenotyping and general system understanding. Electrical methods have come into focus due to their unique sensitivity to various structural and functional root characteristics. The aim of this study is to highlight imaging capabilities of these methods with regard to crop root systems and to investigate changes in electrical signals caused by physiological reactions. Methods Spectral electrical impedance tomography (sEIT) and electrical impedance spectroscopy (EIS) were used in three laboratory experiments to characterize oilseed root systems embedded in nutrient solution. Two experiments imaged the root extension with sEIT, including one experiment monitoring a nutrient stress situation. In the third experiment Responsible Editor: W Richard Whalley. Electronic supplementary materialThe online version of this article (https://doi.electrical signatures were observed over the diurnal cycle using EIS.Results Root system extension was imaged using sEIT under static conditions. During continuous nutrient deprivation, electrical polarization signals decreased steadily. Systematic changes were observed over the diurnal cycle, indicating further sensitivity to associated physiological processes. Spectral parameters suggest polarization processes at the μm scale. Conclusions Electrical imaging methods are able to non-invasively characterize crop root systems in controlled laboratory conditions, thereby offering links to root structure and function. The methods have the potential to be upscaled to the field scale.

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Section: Methodsmentioning

confidence: 99%

Section: Methodological Considerations For Future Experimental Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Imaging and functional characterization of crop root systems using spectroscopic electrical impedance measurements

Weigand

Kemna

2018

Plant Soil

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“…Root activity reflects the strength of the overall metabolism in the root system, and it includes respiration, oxidation, and enzyme activities, 15 which are closely related to life activities. In the present study, the tobacco seedling root activity under metalaxyl stress decreased significantly.…”

Section: Effects Of Different Metalaxyl Enantiomers On Root Activitymentioning

confidence: 99%

Effects of metalaxyl enantiomers stress on root activity and leaf antioxidant enzyme activities in tobacco seedlings

Fang

Zhang

et al. 2018

Chirality

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The objective of this experiment was to study the effects of metalaxyl enantiomers on the activity of roots and antioxidative enzymes in tobacco seedlings. Water culture experiment was conducted to analyze the effects of different concentrations of metalaxyl enantiomers (30 and 10 mg L ) on root activity and leaf superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) activities and malondialdehyde (MDA) content of tobacco seedlings. The results showed that metalaxyl significantly inhibited root activity and significantly improved leaf SOD, POD, and CAT activities and MDA content. A better physiological response in tobacco seedlings was observed at 30 mg L than at 10 mg L metalaxyl. The stereoselectivity for different enantiomers had no obvious effect on root activity and the leaf POD activity, but it affected significantly the SOD and CAT activities and MDA content. The SOD activity was promoted more by R-enantiomer than by S-enantiomer at 30 mg L metalaxyl, and the same effect was observed on CAT activity from the beginning to the end of the stress period. The MDA content under the stress by R-enantiomer was higher than that under the stress by S-enantiomer at 10 mg L metalaxyl.

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Sensing the electrical properties of roots: A review

Ehosioke

Nguyen

Rao

et al. 2020

Vadose Zone Journal

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Thorough knowledge of root system functioning is essential to understand the feedback loops between plants, soil, and climate. In situ characterization of root systems is challenging due to the inaccessibility of roots and the complexity of root zone processes. Electrical methods have been proposed to overcome these difficulties. Electrical conduction and polarization occur in and around roots, but the mechanisms are not yet fully understood. We review the potential and limitations of low‐frequency electrical techniques for root zone investigation, discuss the mechanisms behind electrical conduction and polarization in the soil–root continuum, and address knowledge gaps. A range of electrical methods for root investigation is available. Reported methods using current injection in the plant stem to assess the extension of the root system lack robustness. Multi‐electrode measurements are increasingly used to quantify root zone processes through soil moisture changes. They often neglect the influence of root biomass on the electrical signal, probably because it is yet to be well understood. Recent research highlights the potential of frequency‐dependent impedance measurements. These methods target both surface and volumetric properties by activating and quantifying polarization mechanisms occurring at the root segment and cell scale at specific frequencies. The spectroscopic approach opens up a range of applications. Nevertheless, understanding electrical signatures at the field scale requires significant understanding of small‐scale polarization and conduction mechanisms. Improved mechanistic soil–root electrical models, validated with small‐scale electrical measurements on root systems, are necessary to make further progress in ramping up the precision and accuracy of multi‐electrode tomographic techniques for root zone investigation.

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Indirect monitoring of root activity in soybean cultivars under contrasting moisture regimes by measuring electrical capacitance

Cited by 28 publications

References 36 publications

Imaging and functional characterization of crop root systems using spectroscopic electrical impedance measurements

Imaging and functional characterization of crop root systems using spectroscopic electrical impedance measurements

Effects of metalaxyl enantiomers stress on root activity and leaf antioxidant enzyme activities in tobacco seedlings

Sensing the electrical properties of roots: A review

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