TY - JOUR
T1 - Physiological changes and anti-oxidative responses of Arabidopsis plants after acute and chronic γ-irradiation
AU - Goh, Eun Jeong
AU - Kim, Jin Baek
AU - Kim, Wook Jin
AU - Ha, Bo Keun
AU - Kim, Sang Hoon
AU - Kang, Si–Yong –Y
AU - Seo, Yong Weon
AU - Kim, Dong Sub
N1 - Funding Information:
This work was supported by grants from the Korea Atomic Energy Research Institute (KAERI) and the Nuclear R and D Program by the Ministry of Science, ICT and Future Planning (MSIP), Republic of Korea.
Publisher Copyright:
© 2014, Springer-Verlag Berlin Heidelberg.
PY - 2014/11
Y1 - 2014/11
N2 - To identify the effects of acute and chronic γ-irradiation in Arabidopsis plants, physiological responses and antioxidant-related gene expression were investigated. Seedlings were exposed to 200 Gy of γ-irradiation in acute manner for 1 or 24 h (A1 and A24) or in chronic manner for 1, 2, or 3 weeks (C1 W, C2 W, and C3 W). Plant height, silique number, and silique length in A1 and A24 irradiated plants were significantly reduced when compared to non-irradiated plants. Silique number decreased in response to both acute and chronic irradiation, except with the C3 W treatment, and the number of trichomes dramatically increased in A1 and C1 W. Electron spin resonance signal intensities increased in A1 and in all chronically irradiated plants, but decreased in the A24-treated plant. To investigate the effects of acute and chronic γ-irradiation on antioxidant enzymes, we examined activity of four antioxidant enzymes: catalase (CAT), peroxidase (POD), ascorbate peroxidase, and superoxide dismutase. In general, POD and CAT activities decreased in response to acute and chronic γ-irradiation. Oligonucleotide microarrays were used to investigate transcriptional changes after irradiation. Several genes related to reactive oxygen species signaling were up-regulated after acute and chronic exposure, including genes encoding heat shock factors, zinc finger proteins, NADPH oxidase, WRKY DNA-binding proteins, and calcium binding proteins. Taken together, our data indicate that the responses and activation of antioxidant systems prompted by irradiation exposure are dependent upon the γ-ray dose rate.
AB - To identify the effects of acute and chronic γ-irradiation in Arabidopsis plants, physiological responses and antioxidant-related gene expression were investigated. Seedlings were exposed to 200 Gy of γ-irradiation in acute manner for 1 or 24 h (A1 and A24) or in chronic manner for 1, 2, or 3 weeks (C1 W, C2 W, and C3 W). Plant height, silique number, and silique length in A1 and A24 irradiated plants were significantly reduced when compared to non-irradiated plants. Silique number decreased in response to both acute and chronic irradiation, except with the C3 W treatment, and the number of trichomes dramatically increased in A1 and C1 W. Electron spin resonance signal intensities increased in A1 and in all chronically irradiated plants, but decreased in the A24-treated plant. To investigate the effects of acute and chronic γ-irradiation on antioxidant enzymes, we examined activity of four antioxidant enzymes: catalase (CAT), peroxidase (POD), ascorbate peroxidase, and superoxide dismutase. In general, POD and CAT activities decreased in response to acute and chronic γ-irradiation. Oligonucleotide microarrays were used to investigate transcriptional changes after irradiation. Several genes related to reactive oxygen species signaling were up-regulated after acute and chronic exposure, including genes encoding heat shock factors, zinc finger proteins, NADPH oxidase, WRKY DNA-binding proteins, and calcium binding proteins. Taken together, our data indicate that the responses and activation of antioxidant systems prompted by irradiation exposure are dependent upon the γ-ray dose rate.
KW - Acute and chronic irradiation
KW - Antioxidant enzymes
KW - Microarray
KW - Physiological response
UR - http://www.scopus.com/inward/record.url?scp=84919913745&partnerID=8YFLogxK
U2 - 10.1007/s00411-014-0562-5
DO - 10.1007/s00411-014-0562-5
M3 - Article
C2 - 25169704
AN - SCOPUS:84919913745
VL - 53
SP - 677
EP - 693
JO - Radiation and Environmental Biophysics
JF - Radiation and Environmental Biophysics
SN - 0301-634X
IS - 4
ER -