Related Experiment Video
Updated: Feb 21, 2026

Enhancement of the Initial Growth Rate of Agricultural Plants by Using Static Magnetic Fields
Published on: July 8, 2016
Biophysical control of the growth of Agrobacterium tumefaciens using extremely low frequency electromagnetic waves at
M Ali Fadel1, Reem H El-Gebaly1, Shaimaa A Mohamed1
1Biophysics Department, Faculty of Science, Cairo University, Egypt.
Abstract:
Isolated Agrobacterium tumefaciens was exposed to different extremely low frequencies of square amplitude modulated waves (QAMW) from two generators to determine the resonance frequency that causes growth inhibition. The carrier was 10 MHz sine wave with amplitude ±10 Vpp which was modulated by a second wave generator with a modulation depth of ± 2Vpp and constant field strength of 200 V/m at 28 °C. The exposure of A. tumefaciens to 1.0 Hz QAMW for 90 min inhibited the bacterial growth by 49.2%. In addition, the tested antibiotics became more effective against A. tumefaciens after the exposure. Furthermore, results of DNA, dielectric relaxation and TEM showed highly significant molecular and morphological changes due to the exposure to 1.0 Hz QAMW for 90 min. An in-vivo study has been carried out on healthy tomato plants to test the pathogenicity of A. tumefaciens before and after the exposure to QAMW at the inhibiting frequency. Symptoms of crown gall and all pathological symptoms were more aggressive in tomato plants treated with non-exposed bacteria, comparing with those treated with exposed bacteria. We concluded that, the exposure of A. tumefaciens to 1.0 Hz QAMW for 90 min modified its cellular activity and DNA structure, which inhibited the growth and affected the microbe pathogenicity.
More Related Videos
11:16A Hydroponic Co-cultivation System for Simultaneous and Systematic Analysis of Plant/Microbe Molecular Interactions and Signaling
Published on: July 22, 2017
08:00Author Spotlight: Optimized Transformation Protocol for Chlorella vulgaris Using Agrobacterium tumefaciens
Published on: October 27, 2023
Related Concept Videos
Physical Methods for Controlling Microbial Growth: Radiation and Filtration
Biological Methods for Microbial Control
Gene Regulation in Microbial Communities: Quorum Sensing
Physical Methods for Controlling Microbial Growth: Temperature
Methods for Controlling Microbial Growth