Experiments were conducted on the bioelectrical potential and resistance of soybean (Glycine max) roots, stems, leaves and pods. Results showed a higher potential and lower electrical resistance associated with the leaf cushion, main vein and small vein areas in comparison with other parts of the plant. When two needles were inserted into one of the low resistance points, i.e., the leaf cushion area, the electrical resistance decreased 26.0% on the main vein and 4.5% on the mesophyll of the soybean leaf for at least 5 hours after acupuncture. These characteristics, similar to those of meridian transmission lines in humans and other animals, suggest that a meridian system might also exist in plants.
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Hou et al. (1994) studied this question.