A mechanistic model for electrical conduction in soil–root continuum: a virtual rhizotron study

Rao, Sathyanarayan; Meunier, Félicien; Ehosioke, Solomon; Lesparre, Nolwenn; Kemna, Andreas; Nguyen, Frédéric; Garré, Sarah; Javaux, Mathieu

doi:10.5194/bg-2018-280

Cited by 10 publications

(8 citation statements)

References 3 publications

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“…Similarly, Anderson and Higinbotham (1976) found that σ cr of maize cortical sleeves was comparable to the stele σ cl . Recently, Rao et al (2018) found that maize root conductivity decreases as the root cross-sectional area increases, and that primary roots were more conductive than brace roots. By contrast, BIA studies on woody plants have supported the hypothesis of a radial isolation effect of bark and/or suberized tissues (Čermák et al 2006;Aubrecht et al 2006).…”

Section: Current Pathways In Rootsmentioning

confidence: 99%

Imaging of plant current pathways for non-invasive root Phenotyping using a newly developed electrical current source density approach

Peruzzo

Chou

et al. 2020

Plant Soil

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Aims The flow of electric current in the root-soil system relates to the pathways of water and solutes, its characterization provides information on the root architecture and functioning. We developed a current source density approach with the goal of non-invasively image the current pathways in the root-soil system. Methods A current flow is applied from the plant stem to the soil, the proposed geoelectrical approach images the resulting distribution and intensity of the electric current in the root-soil system. The numerical inversion procedure underlying the approach was tested in numer

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Section: Current Pathways In Rootsmentioning

confidence: 99%

Imaging of plant current pathways for non-invasive root Phenotyping using a newly developed electrical current source density approach

Peruzzo

Chou

et al. 2020

Plant Soil

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“…In most soil types, electrical resistivity (ER) can be described as a function of porosity, saturation of electrolyte, its pH and mineralization within the pores (Archie, 1942), clay con-tent (and generalized Archie's laws) and temperature (e.g., Campbell et al, 1949). Water content could be derived from the measured ER using pedotransfer functions such as the well-known Archie's law or other approaches (e.g., Rhoades et al, 1976;Waxman and Smits, 1968). Since absolute soil moisture content is of limited interest for researchers and professionals which are focused on the soil water availability for the plant, several studies relate the application of the variation of ERT or the fraction of electrical resistivity variation (FERV) introduced by Brillante et al (2016) as a predictor of the fraction of transpirable soil water (FTSW) and related variables.…”

Section: Noninvasive Measurements and Electricalmentioning

confidence: 99%

Small-scale characterization of vine plant root water uptake via 3-D electrical resistivity tomography and mise-à-la-masse method

Mary

Peruzzo

Boaga

et al. 2018

Hydrol. Earth Syst. Sci.

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Abstract. The investigation of plant roots is inherently difficult and often neglected. Being out of sight, roots are often out of mind. Nevertheless, roots play a key role in the exchange of mass and energy between soil and the atmosphere, in addition to the many practical applications in agriculture. In this paper, we propose a method for roots imaging based on the joint use of two electrical noninvasive methods: electrical resistivity tomography (ERT) and mise-à-la-masse (MALM). The approach is based on the key assumption that the plant root system acts as an electrically conductive body, so that injecting electrical current into the plant stem will ultimately result in the injection of current into the subsoil through the root system, and particularly through the root terminations via hair roots. Evidence from field data, showing that voltage distribution is very different whether current is injected into the tree stem or in the ground, strongly supports this hypothesis. The proposed procedure involves a stepwise inversion of both ERT and MALM data that ultimately leads to the identification of electrical resistivity (ER) distribution and of the current injection root distribution in the three-dimensional soil space. This, in turn, is a proxy to the active (hair) root density in the ground. We tested the proposed procedure on synthetic data and, more importantly, on field data collected in a vineyard, where the estimated depth of the root zone proved to be in agreement with literature on similar crops. The proposed noninvasive approach is a step forward towards a better quantification of root structure and functioning.

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“…In this study we made considerations to create a more natural environment for plant growth. Recent studies [28, 38] employ 2D rhizotrons that allow the direct observation of the RSA. The advantage of such systems is that the quantitative ability of EIT could be further explored by scanning root length with other computed-tomography methods.…”

Section: Discussionmentioning

confidence: 99%

“…This field is still under continuous development, and new approaches are being established. For instance, Rao et al [38] suggest a combined use of ERT and plant-water-flow models to further understand their pedophysical interactions with soil.…”

Section: Introductionmentioning

confidence: 99%

Electrical impedance tomography as a tool for phenotyping plant roots

et al. 2019

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Background Plant roots are complex, three-dimensional structures that play a central role in anchorage, water and nutrient acquisition, storage and interaction with rhizosphere microbes. Studying the development of the plant root system architecture is inherently difficult as soil is not a transparent medium. Results This study uses electrical impedance tomography (EIT) to visualise oilseed rape root development in horticultural compost. The development of healthy, control plants and those infected with the gall-forming pathogen, Plasmodiophora brassicae —the causative agent of clubroot disease—were compared. EIT measurements were used to quantify the development of the root system and distinguish between control and infected plants at the onset of gall formation, approximately 20 days after inoculation. Although clear and stark differences between healthy and infected plants were obtained by careful (and hence laborious) packing of the growth medium in layers within the pots; clubroot identification is still possible without a laborious vessel filling protocol. Conclusions These results demonstrate the utility of EIT as a low-cost, non-invasive, non-destructive method for characterising root system architecture and plant-pathogen interactions in opaque growth media. As such it offers advantages over other root characterisation techniques and has the potential to act as a low-cost tool for plant phenotyping. Electronic supplementary material The online version of this article (10.1186/s13007-019-0438-4) contains supplementary material, which is available to authorized users.

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A mechanistic model for electrical conduction in soil–root continuum: a virtual rhizotron study

Cited by 10 publications

References 3 publications

Imaging of plant current pathways for non-invasive root Phenotyping using a newly developed electrical current source density approach

Imaging of plant current pathways for non-invasive root Phenotyping using a newly developed electrical current source density approach

Small-scale characterization of vine plant root water uptake via 3-D electrical resistivity tomography and mise-à-la-masse method

Electrical impedance tomography as a tool for phenotyping plant roots

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