Introducing The “Newmed Effect”:A New Phenomenon which Mimic Radiation Induced bystander Effect and Amplifies The Biopositive Effects of very Low Doses of Gamma Radiation

B. Nosrati ¹,  S. M. J Mortazavi ^2,3*, T. Nejadsattari⁴ and P. Jonoubi ⁵

¹Department of Biology, Faculty of Sciences , Science and Research Branch, Islamic Azad University , Tehran, Iran.

²Ionizing and Non-ionizing Radiation Protection Research Center (INIRPRC), Shiraz University of Medical Sciences, Shiraz, Iran.

³Professor of Medical Physics, Medical Physics Department, School of Medicine, University of Medical Sciences, Shiraz, Iran.

⁴Department of Biology, Faculty of Sciences , Science and Research Branch, Islamic Azad University , Tehran, Iran.

⁵Department of Plant Biology, Faculty of Biological Sciences Section, Kharazmi University, Tehran, Iran.

Corresponding Author E-mail: mmortazavi@sums.ac.ir

DOI : http://dx.doi.org/10.13005/bbra/2124

ABSTRACT: In this paper we present our findings regarding a phenomenon which mimic bystander effect and significantly amplifies the stimulatory effects of low dose radiation. Thirty Triticum aestivum grains served as the “control group” while in the 2nd group 30 grains were exposed to gamma radiation emitted by Tc-99m. In the 3rd group, irradiated seeds were transferred to a new culture medium. The seeds in the 4th group were discarded after irradiation andt new un-irradiated cells were transferred to the irradiated medium. Exposure of Triticum aestivum to very low levels of ionizing radiation in the range of a few mSv enhanced root length, stem length, germination capacity, germination speed, fresh weight and the chlorophyll content. It was interestingly discovered that transferring irradiated seeds to a new medium, enhances root length, stem length, dry weight and the chlorophyll content. To the best of our knowledge this is the first report on the phenomenon we called it “New Med effect”. As far as we know, this is the 1st report on the stimulatory bioeffects of exposure to very low doses of gamma radiation in Triticum aestivum. Further studies are needed to shed light on different aspects as well as potential applications of this effect.

KEYWORDS: Hormetic Effects; Low Dose Radiation; Bystander Effect; Growth; Wheat; Triticum aestivum

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