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Alleviation of low-temperature photoinhibition in gamma-irradiated red pepper (Capsicum annuum L.) plants

한국식물학회지 2006년 49권 5호 p.353 ~ 353
 ( Kim Jin-Hong ) - Korea Atomic Energy Research Institute Advanced Radiation Technology Institute

 ( Kim Jae-Sung ) - Korea Atomic Energy Research Institute Advanced Radiation Technology Institute
 ( An Byung-Chull ) - Korea Atomic Energy Research Institute Advanced Radiation Technology Institute
정병엽 ( Chung Byung-Yeoup ) - Korea Atomic Energy Research Institute Advanced Radiation Technology Institute

Abstract


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.

키워드

Capsicum annuum; chlorophyll fluorescence; gamma radiation; low-temperature photoinhibition; photo-oxidative stress
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