Effects of Low Dose Gamma-irradiation on Alleviation of Salt Stress in Rice (Oryza sativa L.) Seedling

저선량 감마선 조사가 벼 유묘의 염 스트레스 경감에 미치는 영향

  • Baek, Myung-Hwa (Division of Radiation Application Research, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute) ;
  • Kim, Jin-Hong (Division of Radiation Application Research, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute) ;
  • Wi, Seung-Gon (Division of Radiation Application Research, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute) ;
  • Lee, In-Jung (Department of Agronomy, Kyungpook National University) ;
  • Lee, Kyu-Seong (National Institute of Crop Science, R.D.A.) ;
  • Kim, Jae-Sung (Division of Radiation Application Research, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute)
  • 백명화 (한국원자력연구소 방사선이용연구부) ;
  • 김진홍 (한국원자력연구소 방사선이용연구부) ;
  • 위승곤 (한국원자력연구소 방사선이용연구부) ;
  • 이인중 (경북대학교 농학과) ;
  • 이규성 (농촌진흥청 작물과학원) ;
  • 김재성 (한국원자력연구소 방사선이용연구부)
  • Published : 2005.06.30


To investigate alleviation effects of salt stress by low dose gamma-irradiation on seedling growth of rice (Oryza shrive L), in plants of two rice cultivars (Ilpumbyeo and Gancheokbyeo), seeds were irradiated with the different doses $(0{\sim}32\;Gy)$ of gamma-ray by irradiator ($^{60}Co$, ca.150 TBq of capacity, AECL). The salt stress caused a remarkable decrease of seedling growth, particularly for dry weight. In addition, relative growth rate was decreased over 50% by the salt stress. However, the salt stress-induced inhibition of growth was alleviated by gamma-irradiation. Especially, the relative growth rate of shoot showed the reduction effect over 30% at 4 Gy-irradiated groups as compared with that of control. Also, electrolyte leakage and relative water content were damaged, respectively 4 times and 30% by the salt stress but the damages were alleviated by the gamma-irradiation. These alleviation effects were observed similarly in both the cultivars tested. These results suggest that the low dose gamma-irradiation may have a better protection or the salt stress.


Alleviation effects;low dose gamma-irradiation;salt stress;seedling growth;electrolyte leakage;relative water content


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