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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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We studied the radiation-induced stress resistance in red pepper leaves under conditions of low-temperature photoinhibition or artificially induced photo-oxidative stress. Plants irradiated with 4, 8, or 16-Gy gamma rays were more resistant to both stress factors than were the controls. However, exposure to a low temperature for 12 h with illumination or photo-oxidative treatment for 1 h differentially affected the irradiated leaves, although they had similar stress intensities as defined by their maximal photochemical efficiencies (Fv/Fm). Decreases in Fv/Fm induced by the two stress factors were instead alleviated, dose-dependently, by as much as 22 to 41% (low temperature) or 14 to 29% (photo-oxidation) in the irradiated groups. In contrast, non-photochemical quenching (NPQ) and the de-epoxidation state of xanthophyll cycle pigments could not be correlated with this enhanced stress resistance in the irradiated groups. These results suggest that the adaptive response of plants exposed to gamma radiation is more effective in protecting against low-temperature photoinhibition than against photo-oxidative stress. We also discuss here the involvement of antioxidative defense systems for increased resistance against low-temperature photoinhibition in irradiated red pepper.
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