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Article

Effects of Acute and Chronic Gamma Irradiation on the Cell Biology and Physiology of Rice Plants

1
Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup 56212, Korea
2
Division of Ecological Safety, National Institute of Ecology, Seocheon 33657, Korea
*
Author to whom correspondence should be addressed.
Both authors contributed equally to this work.
Academic Editor: Christopher Cazzonelli
Plants 2021, 10(3), 439; https://doi.org/10.3390/plants10030439
Received: 21 January 2021 / Revised: 17 February 2021 / Accepted: 22 February 2021 / Published: 25 February 2021
(This article belongs to the Special Issue Effects of Radiation on Plants)
The response to gamma irradiation varies among plant species and is affected by the total irradiation dose and dose rate. In this study, we examined the immediate and ensuing responses to acute and chronic gamma irradiation in rice (Oryza sativa L.). Rice plants at the tillering stage were exposed to gamma rays for 8 h (acute irradiation) or 10 days (chronic irradiation), with a total irradiation dose of 100, 200, or 300 Gy. Plants exposed to gamma irradiation were then analyzed for DNA damage, oxidative stress indicators including free radical content and lipid peroxidation, radical scavenging, and antioxidant activity. The results showed that all stress indices increased immediately after exposure to both acute and chronic irradiation in a dose-dependent manner, and acute irradiation had a greater effect on plants than chronic irradiation. The photosynthetic efficiency and growth of plants measured at 10, 20, and 30 days post-irradiation decreased in irradiated plants, i.e., these two parameters were more severely affected by acute irradiation than by chronic irradiation. In contrast, acutely irradiated plants produced seeds with dramatically decreased fertility rate, and chronically irradiated plants failed to produce fertile seeds, i.e., reproduction was more severely affected by chronic irradiation than by acute irradiation. Overall, our findings suggest that acute gamma irradiation causes instantaneous and greater damage to plant physiology, whereas chronic gamma irradiation causes long-term damage, leading to reproductive failure. View Full-Text
Keywords: acute and chronic irradiation; DNA damage; oxidative stress; antioxidant activity; photosynthetic efficiency; growth and reproduction acute and chronic irradiation; DNA damage; oxidative stress; antioxidant activity; photosynthetic efficiency; growth and reproduction
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MDPI and ACS Style

Choi, H.-I.; Han, S.M.; Jo, Y.D.; Hong, M.J.; Kim, S.H.; Kim, J.-B. Effects of Acute and Chronic Gamma Irradiation on the Cell Biology and Physiology of Rice Plants. Plants 2021, 10, 439. https://doi.org/10.3390/plants10030439

AMA Style

Choi H-I, Han SM, Jo YD, Hong MJ, Kim SH, Kim J-B. Effects of Acute and Chronic Gamma Irradiation on the Cell Biology and Physiology of Rice Plants. Plants. 2021; 10(3):439. https://doi.org/10.3390/plants10030439

Chicago/Turabian Style

Choi, Hong-Il, Sung M. Han, Yeong D. Jo, Min J. Hong, Sang H. Kim, and Jin-Baek Kim. 2021. "Effects of Acute and Chronic Gamma Irradiation on the Cell Biology and Physiology of Rice Plants" Plants 10, no. 3: 439. https://doi.org/10.3390/plants10030439

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