Analysis of the willow root system by electrical impedance spectroscopy.
Information on plant roots is increasingly needed for understanding and managing plants under various environmental conditions, including climate change. Several methods have been developed to study fine roots but they are either destructive or cumbersome, or may not be suitable for studies of fine root functionality. Electrical impedance, resistance, and capacitance have been proposed as possible non-destructive measures for studying roots. Their use is limited by a lack of knowledge concerning the electrical circuit of the system. Electrical impedance spectroscopy (EIS) was used for hydroponically raised willows (Salix schwerinii) to estimate the root system size. The impedance spectra were investigated in three experimental set-ups and the corresponding appropriate lumped models were formulated. The fit of the proposed lumped models with the measured impedance spectra data was good. The model parameters were correlated with the contact area of the roots and/or stems raised in the hydroponic solution. The EIS method proved a useful non-destructive method for assessing root surface area. This work may be considered to be a new methodological contribution to understanding root systems and their functions in a non-destructive manner.
Cao
Yang
Y
School of Forest Sciences, University of Eastern Finland, PO Box 111, FI-80101 Joensuu, Finland. yang.cao@uef.fi
Repo
Tapani
T
Silvennoinen
Raimo
R
Lehto
Tarja
T
Pelkonen
Paavo
P
D058266:Dielectric Spectroscopy / Q000379:methods*; D017097:Electric Impedance; D018517:Plant Roots / Q000737:chemistry*; D032108:Salix / Q000737:chemistry*
Ann Biomed Eng. 1992;20(3):289-305
1443825
Tree Physiol. 2006 Sep;26(9):1105-12
16740486
New Phytol. 1991 Sep;119(1):137-147
33874339
J Exp Bot. 2000 Dec;51(353):2095-107
11141183
Tree Physiol. 2006 Sep;26(9):1113-21
16740487
J Exp Bot. 2010 May;61(9):2491-7
20363862
Tree Physiol. 2004 Jul;24(7):833-43
15123455
Annu Rev Biomed Eng. 2006;8:63-91
16834552
J Anim Sci. 2004 Mar;82(3):816-25
15032439