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Relationship between Growth and Electric Oscillations in Bean Roots. 1990

M Souda, and K Toko, and K Hayashi, and T Fujiyoshi, and S Ezaki, and K Yamafuji
Department of Electronics, Faculty of Engineering, Kyushu University 36, Fukuoka 812, Japan.

Extracellular and intracellular electric potentials in bean roots are known to show electric oscillations along the longitudinal axis with a period of several minutes. The relationship between growth and the electric oscillations was studied using roots of adzuki (Phaseolus chrysanthos). We measured surface electric potentials with a multielectrode apparatus while simultaneously measuring elongation using a CCD camera and monitor. Roots having an electric oscillation grew faster than roots with no oscillation. Furthermore, elongation rate was higher in roots with higher oscillation frequency. Oscillation frequency had a strong dependence on temperature; i.e. Q(10) was estimated at 1.7. These results suggest a correlation between electric oscillation and elongation.

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