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http://dx.doi.org/10.5010/JPB.2016.43.3.359

Expression profile of defense-related genes in response to gamma radiation stress  

Park, Nuri (Dept. of Horticulture, Chungnam National University)
Ha, Hye-Jeong (Dept. of Horticulture, Chungnam National University)
Subburaj, Saminathan (Dept. of Horticulture, Chungnam National University)
Choi, Seo-Hee (Dept. of Horticulture, Chungnam National University)
Jeon, Yongsam (Dept. of Horticulture, Chungnam National University)
Jin, Yong-Tae (Dept. of Horticulture, Chungnam National University)
Tu, Luhua (Dept. of Horticulture, Chungnam National University)
Kumari, Shipra (Dept. of Horticulture, Chungnam National University)
Lee, Geung-Joo (Dept. of Horticulture, Chungnam National University)
Publication Information
Journal of Plant Biotechnology / v.43, no.3, 2016 , pp. 359-366 More about this Journal
Abstract
Tradescantia is a perennial plant in the family of Commelinaceae. It is known to be sensitive to radiation. In this study, Tradescantia BNL 4430 was irradiated with gamma radiation at doses of 50 to 1,000 mGy in a phytotron equipped with a $^{60}Co$ radiation source at Korea Atomic Energy Research Institute, Korea. At 13 days after irradiation, we extracted RNA from irradiated floral tissues for RNA-seq. Transcriptome assembly produced a total of 77, 326 unique transcripts. In plantlets exposed to 50, 250, 500, and 1000 mGy, the numbers of up-regulated genes with more than 2-fold of expression compared that in the control were 116, 222, 246, and 308, respectively. Most of the up-regulated genes induced by 50 mGy were heat shock proteins (HSPs) such as HSP 70, indicating that protein misfolding, aggregation, and translocation might have occurred during radiation stress. Similarly, highly up-regulated transcripts of the IQ-domain 6 were induced by 250 mGy, KAR-UP oxidoreductase 1 was induced by 500 mGy, and zinc transporter 1 precursor was induced by 1000 mGy. Reverse transcriptase (RT) PCR and quantitative real time PCR (qRT-PCR) further validated the increased mRNA expression levels of selected genes, consistent with DEG analysis results. However, 2.3 to 97- fold higher expression activities were induced by different doses of radiation based on qRT-PCR results. Results on the transcriptome of Tradescantia in response to radiation might provide unique identifiers to develop in situ monitoring kit for measuring radiation exposure around radiation facilities.
Keywords
Differentially expressed genes; Gamma radiation; Radiation indicator; Tradescantia; Transcriptome analysis;
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