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KMID : 0368419900330020111
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Journal of Plant Biology
1990 Volume.33 No. 2 p.111 ~ p.117
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Characteristics of Photosynthetic Electron Transport Activity in Isolated Chloroplasts of Korean Ginseng and Radish
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Kim, Kab Sig/金甲植
Son, Jong Hyeoun/Choi, Kwang Tae/孫宗玄/崔光泰
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Abstract
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In order to characterize the chloroplasts of Korean ginseng as a semi-shade plant and radish as a sun plant, effects of growth light intensity on photosynthetic electron transport (PS) activity in chloroplasts and superoxide (O_2·^-) production in thylakoid membrane by irradiation were investigated. High-light chloroplasts of both plants showed higher PS activities than those grown under low growth light intensity. High PSⅡ and low PSⅠ activities in ginseng chloroplasts (ratio of PSⅡ/PSⅠ:1.1) were observed, but radish chloroplasts showed low PSⅡ and high PSⅠ activities (ratio of PSⅡ/PSⅠ:0.3). PSⅡ activity of both plants was little affected by temperature in ranges of 15-35℃. Activities of whole-chain (PSⅡ+Ⅰ) in ginseng and PSⅠ in radish were increased at high temperature (40℃). Preincubation of chloroplasts at 40℃ during 30 min, as a mild heat stress, caused rapid decrease in PSⅡ and PSⅡ+Ⅰ activities of both plants. However PSⅠ activity was not decreased in ginseng and rather increased in radish. O_2·^- production (NBT reduction) in Mehler reaction in the thylakoid membrane was inhibited by DCMU in both plants. DMBIB inhibited O_2·^- production in ginseng, but radish was insensitive to DMBIB. Electron flow system in ginseng thylakoid membrane was more susceptible to damage of photooxidation than that of radish.
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