Alleviation of salt stress by low dose gamma-irradiation in rice
Baek, M.H.(Korea Atomic Energy Research Inst., Daejon (Korea Republic). Div. of Radiation Application Research) | Kim, J.H. | Chung, B.Y.E-mail:bychung@kaeri.re.kr | Kim, J.S. | Lee, I.S.
The effects of salt stress on the growth, photosynthesis, and antioxidative ability of rice plants started from gamma-irradiated seeds were investigated using two cultivars, Ilpumbyeo and Sanghaehyanghyella. The 50 and 100 mM NaCl solutions caused a remarkable decrease of the early germination rate and seedling growth. However, the salt stress-induced inhibition of the growth was significantly alleviated in the gamma-irradiated plants. The chlorophyll contents and the effective quantum yield of photosystem 2 ( PS 2) were lower in the NaCl-treated plants than in the control ones, whereas the non-photochemical quenching was higher in the former ones. Superoxide dismutase (SOD) and ascorbate peroxidase (APX) activities increased with increasing NaCl concentrations, the irradiated groups had even higher SOD and APX activities than the non-irradiated ones. These effects were observed in both cultivars.
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