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Microwaves affect Myriophyllum aquaticum plants differently depending on the wave polarization

  • Original Paper
  • Published:
Biologia Plantarum

Abstract

Previous studies on microwave exposure on plants have revealed variations in sensitivity of plants to different microwave frequencies, exposure durations, and power intensities. However, the effects of different polarizations of microwaves on plants have not been studied. Therefore, we investigated the effect of horizontally and vertically polarized 2 GHz continuous microwaves on Myriophyllum aquaticum plants at 1.8 W m-2 power density. The electric potential variation along the vascular tissues were investigated for 1.5 h and growth parameters, pigmentation, and H2O2 formation were studied during 48 h microwave exposure. Exposure to horizontally polarized microwaves, decreased standard deviation of electric potential variation and increased H2O2 content significantly. Vertically polarized microwaves increased the standard deviation of electric potential variation and photosynthetic pigments significantly. However, none of the polarizations altered growth parameters (shoot length, stem diameter, and internodal length). Thermographic images taken for 1 h continuous microwave exposure did not indicate alteration in the temperature of the plants for both vertical and horizontal polarities.

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Abbreviations

EMR:

electromagnetic radiation

EP:

electric potential

hPol:

horizontally polarized

on-EMR:

during microwave exposure

post-EMR:

post microwave exposure

pre-EMR:

before microwave exposure

ROS:

reactive oxygen species

Rx:

receiving

SDEP:

standard deviation of the electric potential fluctuations

Tx:

transmission

vPo:

vertically polarized

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Authors and Affiliations

  1. Ocean University of Sri Lanka, Crow-Island, Colombo 15, Sri Lanka

    M. D. H. J. Senavirathna

  2. Department of Environmental Science and Technology, Saitama University, Sakura-ku, Saitama, 338-8570, Japan

    T. Asaeda

Authors
  1. M. D. H. J. Senavirathna
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  2. T. Asaeda
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Correspondence to M. D. H. J. Senavirathna.

Additional information

Acknowledgements: The authors would like to thank Prof. Hirofumi Kadono and Dr. Makoto Miwa for their supports during the study and Prof. Yuichi Kimura and Mr. Sakuyoshi Saito for their support in the preparation of the microwave exposure system. This work was financially supported by the Ministry of Education, Culture, Sports, Science and Technology, Japan.

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Senavirathna, M.D.H.J., Asaeda, T. Microwaves affect Myriophyllum aquaticum plants differently depending on the wave polarization. Biol Plant 61, 378–384 (2017). https://doi.org/10.1007/s10535-016-0660-0

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  • DOI: https://doi.org/10.1007/s10535-016-0660-0

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