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Alterations in the photosynthetic pigments and antioxidant machineries of red pepper (Capsicum annuum L.) seedlings from gamma-irradiated seeds

한국식물학회지 2004년 47권 4호 p.314 ~ 321
 ( Kim Jin-Hong ) - Korea Atomic Energy Research Institute Division of Radiation Application Research

 ( Baek Myung-Hwa ) - Korea Atomic Energy Research Institute Division of Radiation Application Research
정병엽 ( Chung Byung-Yeoup ) - Korea Atomic Energy Research Institute Division of Radiation Application Research
위승곤 ( Wi Seung-Gon ) - Korea Atomic Energy Research Institute Division of Radiation Application Research
 ( Kim Jae-Sung ) - Korea Atomic Energy Research Institute Division of Radiation Application Research

Abstract


To characterize the stimulatory effects of low-dose gamma radiation on early plant growth, we investigated alterations in the photosynthesis and antioxidant capacity of red pepper (Capsicum annuum L.) seedlings produced from gamma-irradiated seeds. For two cultivars (Yeomyung and Joheung), three irradiation groups (2, 4, and 8 Gy, but not 16 Gy) showed enhanced development, although Fv/Fm, the maximum photochemical efficiency of Photosystem II (PSII), did not differ significantly among any of the four groups. In contrast, values for 1/Fo ? 1/Fm, i.e., a measure of functional PSII content, decreased in the irradiated groups of ‘Yeomyung’ but increased in those of ‘Joheung’. Pigment analyses and enzyme activity assays revealed that irradiation altered the compositions of photosynthetic pigments (chlorophylls and carotenoids) as well as the activities of antioxidant enzymes (superoxide dismutase and glutathione reductase). However, these shifts were not directly related to the increase in early growth, although they were cultivar-and developmental stage-dependent In addition, the effects of irradiation on the enzymatic activities measured here were at opposition between the two cultivars.

키워드

antioxidant enzyme; carotenoid; chlorphyll a fluorescence; low-dose radiation; photosynthesis
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