In-situ root extent measurements by electrical capacitance methods

Dalton, F. N.

doi:10.1007/bf00155527

Cited by 139 publications

(228 citation statements)

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“…Therefore, it is more important to know the activity of roots than merely their distribution in soil (Schmidhaiter ef a/. 1994;Dalton 1995).…”

Section: General Conclusionmentioning

confidence: 99%

The gradient between pre‐dawn rhizoplane and bulk soil matric potentials, and its relation to the pre‐dawn root and leaf water potentials of four species

Schmidhalter

1997

Plant Cell & Environment

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Uptake of soil water by plants may result in significant gradients between bulk soil and soil in the vicinity of roots. Few experimental studies of water potential gradients in close proximity to roots, and no studies on the relationship of water potential gradients to the root and leaf water potentials, have been conducted. The occurrence and importance of pre-dawn gradients in the soil and their relation to the pre-dawn root and leaf water potentials were investigated with seedlings of four species. Pre-germinated seeds were grown without watering for 7 and ltd in a silt loam soil with initial soil matric potentials of-0-02, -0-t and -0-22 MPa. Significant gradients, independent of the species, were observed only at pre-dawn soil matric potentials lower than -0-25 MPa; the initial soil matric potentials were > -0-t MPa. At an initial bulk soil matric potential of -0-22 MPa, a steep gradient between bulk and rhizoplane soil was observed after 7 d for maize (Zea mays L. cv. Issa) and sunflower {Heliaiithus annuiis L. cv. Nanus), in contrast to barley {Hordeum vulgare L. cv. Athos) and wheat {Triticum aestivum L. cv. Kolibri). Predawn root water potentials were usually about the same as the bulk soil matric potential and were higher than the rhizoplane soil matric potential. Pre-dawn root and leaf water potentials tended to be much higher than rhizoplane soil matric potentials when the latter were lower than -()-5 MPa. It is concluded that plants tend to become equilibrated overnight with the wetter bulk soil or with wetter zones in the bulk soil. Plants can thus circumvent negative effects of localized steep pre-dawn soil matric potential gradients. This may be of considerable importance for water uptake and growth in drying soil.

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“…Therefore, it is more important to know the activity of roots than merely their distribution in soil (Schmidhaiter ef a/. 1994;Dalton 1995).…”

Section: General Conclusionmentioning

confidence: 99%

The gradient between pre‐dawn rhizoplane and bulk soil matric potentials, and its relation to the pre‐dawn root and leaf water potentials of four species

Schmidhalter

1997

Plant Cell & Environment

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“…Root tissues undergo characteristic physicochemical changes during plant ontogeny, thus the continuously changing current path and root dielectric properties (eg relative permittivity) leads to an alteration in the computed parameters of the applied regression equation (Cseresnyés et al, 2013a;Dalton, 1995;Ellis et al, 2013). Apart from this limitation, our findings indicate the potential of root EC measurement for in situ monitoring of phenology-dependent changes of plant transpiration and, subsequently, water uptake activity.…”

Section: Resultsmentioning

confidence: 90%

“…1. Principle of electrical capacitance measurement in a plant-soil system, according to Dalton (1995) and Ellis et al (2013).…”

Section: Methodsmentioning

confidence: 99%

“…By inserting an electrode at the plant stem and another one into the soil, and connecting them by a capacitance meter (LCRbridge), root EC proved to be directly correlated with root dry mass and root surface area. According to Dalton (1995) conceptual model, xylem and phloem sap in root forms a low resistance electrical conduit separated from a low resistance external soil or nutrient solution by isolating root membranes (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

“…Rajkai et al (2005) recommended a two-dielectric (series-connected root and soil dielectric) capacitor model, where the capacitive character of the soil solution was also considered. Edaphic factors having influence on the accuracy of EC measurements (ie water saturation, soil texture and salinity, electrode placement) were investigated as well (Dalton, 1995;Ozier-Lafontaine and Bajazet, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous monitoring of electrical capacitance and water uptake activity of plant root system

Cseresnyés¹,

Takács²,

Füzy³

et al. 2014

International Agrophysics

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A b s t r a c t. Pot experiments were designed to test the applicability of root electrical capacitance measurement for in situ monitoring of root water uptake activity by growing cucumber and bean cultivars in a growth chamber. Half of the plants were inoculated with Funneliformis mosseae arbuscular mycorrhizal fungi, while the other half served as non-infected controls. Root electrical capacitance and daily transpiration were monitored during the whole plant ontogeny. Phenology-dependent changes of daily transpiration (related to root water uptake) and root electrical capacitance proved to be similar as they showed upward trends from seedling emergence to the beginning of flowering stage, and thereafter decreased continuously during fruit setting. A few days after arbuscular mycorrhizal fungi-colonization, daily transpiration and root electrical capacitance of infected plants became significantly higher than those of non-infected counterparts, and the relative increment of the measured parameters was greater for the more highly mycorrhizal-dependent bean cultivar compared to that of cucumber. Arbuscular mycorrhizal fungi colonization caused 29 and 69% relative increment in shoot dry mass for cucumbers and beans, respectively. Mycorrhization resulted in 37% increase in root dry mass for beans, but no significant difference was observed for cucumbers. Results indicate the potential of root electrical capacitance measurements for monitoring the changes and differences of root water uptake rate.K e y w o r d s: mycorrhiza, phenology, root electrical capacitance, transpiration, water uptake INTRODUCTION

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Super resolution for root imaging

et al. 2020

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Over the past decade, advances in sensing devices and computer systems have allowed for the proliferation of high-throughput plant phenotyping systems (Das Choudhury et al., 2019). These systems are designed to acquire and analyze a large number of plant traits (Han et al., 2014; Krieger, 2014), including the measure of small structures, such as the venation network of leaves (Endler, 1998; Green et al., 2014). However, the characterization of plant roots is more challenging because they are "hidden" in the soil (Atkinson et al., 2019), which limits the type of sensors and techniques that can be applied. A number of types of methods have previously been used to analyze root traits. Non-imaging-based in situ methods estimate

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In-situ root extent measurements by electrical capacitance methods

Cited by 139 publications

References 20 publications

The gradient between pre‐dawn rhizoplane and bulk soil matric potentials, and its relation to the pre‐dawn root and leaf water potentials of four species

The gradient between pre‐dawn rhizoplane and bulk soil matric potentials, and its relation to the pre‐dawn root and leaf water potentials of four species

Simultaneous monitoring of electrical capacitance and water uptake activity of plant root system

Super resolution for root imaging

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