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Biological Effect of Gamma Rays According to Exposure Time on Germination and Plant Growth in Wheat

Authors
Hong, Min JeongKim, Dae YeonJo, Yeong DeukChoi, Hong-IlAhn, Joon-WooKwon, Soon-JaeKim, Sang HoonSeo, Yong WeonKim, Jin-Baek
Issue Date
3월-2022
Publisher
MDPI
Keywords
wheat; gamma rays; exposure time; free radicals; growth inhibition; mutation breeding
Citation
APPLIED SCIENCES-BASEL, v.12, no.6
Indexed
SCIE
SCOPUS
Journal Title
APPLIED SCIENCES-BASEL
Volume
12
Number
6
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/140461
DOI
10.3390/app12063208
ISSN
2076-3417
Abstract
Gamma rays as a type of ionizing radiation constitute a physical mutagen that induces mutations and could be effectively used in plant breeding. To compare the effects of gamma and ionizing irradiation according to exposure time in common wheat (Keumgang, IT 213100), seeds were exposed to Co-60 gamma rays at different dose rates. To evaluate the amount of free radical content, we used electron spin resonance spectroscopy. Significantly more free radicals were generated in the case of long-term compared with short-term gamma-ray exposure at the same dose of radiation. Under short-term exposure, shoot and root lengths were slightly reduced compared with those of the controls, whereas long-term exposure caused severe growth inhibition. The expression of antioxidant-related and DNA-repair-related genes was significantly decreased under long-term gamma-ray exposure. Long-term exposure caused higher radiosensitivity than short-term exposure. The results of this study could help plant breeders select an effective mutagenic induction dose rate in wheat.
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