engleski

Effect of Electromagnetic Field Exposure on Lemna Minor

Increased use of cellular phones and other sources of microwave radiation require investigations of their effects on living organisms. Such experiments can be conducted in a GTEM-cell, which simulates free space electromagnetic field distribution. Duckweed Lemna minor L. was exposed to the electric field similar to those of the cellular phones and after that growth was measured during two weeks. Growth of plants exposed two hours to the electric field (f = 900 MHz, E=22 V/m) significantly decreased in comparison with the control. Longer exposure period (four hours) did not cause stronger decrease of growth but the (same) electric field with modulation (80% AM) had more inhibitory effect. The electric field with frequencies of 400 MHz (E = 22 V/m, 2 hours) and 1900 MHz (E = 9 V/m, 14 hours) was also investigated but the growth inhibition was not significant in comparison with the control. Preliminary investigations of peroxidase activity were carried out 24 and 72 hours after the exposure to the electromagnetic fields. Increased peroxidase activity suggests that microwave radiation could cause oxidative stress in plants.

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