An improved formula for evaluating electrical capacitance using the dissipation factor

Cseresnyés, Imre; Kabos, Sándor; Takács, Tünde; Végh, Krisztina R.; Vozáry, Eszter; Rajkai, Kálmán

doi:10.1007/s11104-017-3336-4

Cited by 13 publications

(21 citation statements)

References 40 publications

(1 reference statement)

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“…1) demonstrate that the capacitance detected was a reliable predictor of root system size for various species and growing media. The large differences in the regression parameters were consistent with previous observations (Beem et al, 1998;Aulen and Shipley, 2012;Cseresnyés et al, 2017), and showed the relative nature of C RSS measurement. The regression fit (R 2 ) decreased with increasing substrate complexity (pumice < arenosol < chernozem) due to the dielectric behaviour of the variably charged soil colloids, including clay minerals and organic materials (Hilhorst, 1998), which cause interference with the plant response (Ozier-Lafontaine and Bajazet, 2005;Postic and Doussan, 2016).…”

Section: Discussionsupporting

confidence: 91%

“…the reciprocal of the effective capacitance is the sum of the reciprocal of individual capacitances), if the soil capacitance (C Soil ) is much higher than the root capacitance (C Root ), C RSS is determined by the root system (Rajkai et al, 2005;Dietrich et al, 2013). A subsequent study provided experimental support for the concept of TCM (Kormanek et al, 2016), and the high capacitances detected for various types of substrates at field capacity also meet the model's criteria (Dietrich et al, 2013;Ellis et al, 2013;Cseresnyés et al, 2017).…”

Section: Introductionmentioning

confidence: 91%

“…The measurement of electrical capacitance in root-soil systems (C RSS ) is a promising non-destructive approach in the estimation of root size and activity. The method is based on experimentally established correlations between C RSS and the mass, length or surface area of the whole root system (Chloupek, 1972;Cseresnyés et al, 2017). Capacitance is conventionally detected using an LCR meter at ~1 kHz current frequency between a ground electrode inserted into the substrate and a plant electrode (clamp or needle) fixed on the stem base (Aulen and Shipley, 2012;Postic and Doussan, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Influence of substrate type and properties on root electrical capacitance

Cseresnyés¹,

Vozáry²,

Kabos³

et al. 2020

Int. Agrophys.

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Three pot experiments were performed on cucumber, maize, soybean and wheat plants to investigate the effects of various substrate types, namely pumice, arenosol and chernozem soil (Exp. 1), of substrate salinity (Exp. 2) and of soil water content (SWC; Exp. 3) on the electrical capacitance measured in root-soil systems. The data were evaluated according to the basic principle of the two-dielectric capacitor model. Statistical analysis indicated that the capacitance measured in root-soil systems was determined by the capacitance of the root system for each combination of plant species and substrate. Furthermore, the results showed that substrate impedance had a negligible influence on the capacitance measured in root-soil systems. Substrate salinity had no direct effect on capacitance measured in root-soil systems, but salt-induced physicochemical changes in plant tissues could have influenced its dielectric properties. Capacitance measured in rootsoil systems increased exponentially with soil water content (it ranged from 10 to 48 v/v %), indicating that the measured capacitance was more sensitive to variability in moisture content at high rather than at low water saturation levels. This is not consistent with the general consensus that the capacitance method is unreliable in dry soil and should be used at soil water content close to field capacity. The present results will contribute to the more effective application of the root capacitance technique.

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Section: Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of substrate type and properties on root electrical capacitance

Cseresnyés¹,

Vozáry²,

Kabos³

et al. 2020

Int. Agrophys.

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“…The other reason for the decrease in electrical capacitance is that lignin and suberin have a lower permittivity than the other main component materials of the root. The variability in their quantity causes a considerable variation in the dielectric properties of the root tissue (Cseresnyés et al, 2017). A root system with young active roots therefore has a greater capacitance.…”

Section: Theorymentioning

confidence: 99%

Field phenotyping of plant roots by electrical capacitance – a standardized methodological protocol for application in plant breeding: a Review

Středa¹,

Haberle²,

Klimešová³

et al. 2020

Int. Agrophys.

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A b s t r a c t. Due to the absence of a suitable method and standardized procedures, the root systems of plants have been evaluated to a much lesser extent than aboveground organs. The aim of this article is (i) to provide a detailed description and thus standardization of an upgraded procedure of electrical capacitance measurement for evaluating the size of the root system of plants in situ, which allows for a reassessment to be made during the growing season and subsequent harvest of seeds for the planting of selected progenies, (ii) to demonstrate, through a standardized methodological protocol, the applicability of root electrical capacitance measurement as a field phenotyping method for the selection of superior root systems to improve crop abiotic stress tolerance and resource efficiency, (iii) to suggest a standardized methodological protocol for the application of electrical capacitance measurements in breeding nurseries, and (iv) to discuss the methodological aspects, development and limitations of this method. A methodological overview of the use of electrical capacitance to measure plant root systems, which emerged from working groups directed by the author of this unique method, is presented along with a standardized protocol. An overview of the application of electrical capacitance measurements of roots in breeding is shown along with some examples of successful applications.K e y w o r d s: root system, drought tolerance, varieties, yield

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“…Therefore, the differences between the function parameters were attributed to the thick taproot of the species, specifically to the weak allometry between taproot traits, derived from the relatively high root weight to surface area (Cseresnyés et al 2017;Wu et al 2017), and thus were ignored in further analysis.…”

Section: Pilot Experimentsmentioning

confidence: 99%

Root capacitance measurements allow non-intrusive in-situ monitoring of the seasonal dynamics and drought response of root activity in two grassland species

et al. 2020

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Background and aims In this study, the potential of nonintrusive root electrical capacitance (C R) measurements for monitoring the seasonal changes and drought response of root activity was tested on two grassland species in a climate change experiment. Methods C R was detected between a ground electrode inserted into the soil and a plant electrode attached to the stem of the perennial grass Stipa borysthenica and the biennial herb Crepis rhoeadifolia in control and drought plots throughout two growing seasons. A pilot study revealed that C R was strongly correlated with root biomass for a given time and soil water content. The effect of changing soil water content on the measured C R value was accounted for by means of species-specific experimental calibrations. Results Root activity (C R) was found to peak at the flowering stage in late spring (S. borysthenica) or early summer (C. rhoeadifolia). Both the natural shortage of rainfall and the experimental summer drought reduced root activity in both species. Stipa borysthenica displayed great plasticity in root activity, including quick post-treatment recovery during the rainy autumn. The changes observed in root activity were similar to those previously recorded using conventional root investigation techniques (i.e. destructive, minirhizotron, ingrowth core) in temperate grasslands. Conclusions Root capacitance measurements proved to be adequate for monitoring root activity in situ in natural grassland. The method could be particularly useful in studies where plant injury or soil disturbance need to be avoided.

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An improved formula for evaluating electrical capacitance using the dissipation factor

Abstract: 16Background and aims The measurement of electrical capacitance in root-soil system (C R ) is a useful method for

Cited by 13 publications

References 40 publications

Influence of substrate type and properties on root electrical capacitance

Influence of substrate type and properties on root electrical capacitance

Field phenotyping of plant roots by electrical capacitance – a standardized methodological protocol for application in plant breeding: a Review

Root capacitance measurements allow non-intrusive in-situ monitoring of the seasonal dynamics and drought response of root activity in two grassland species

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