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이순희,조영동,홍영남,권영명 ( Sun Hi Lee,Young Dong Cho,Young Nam Hong,Young Myung Kwon ) 생화학분자생물학회 1982 BMB Reports Vol.15 No.2
Development of chloroplast, ability of CO₂-fixation, photosynthetic early intermediates and activities of catalase and glycolate oxidase were observed during greening process. Such results were discussed with the formation of CP-complex. The phenomenon of chloroplast development was similar to other plants, but the rate of process was relatively slow, and ability of CO₂-fixation was slow accordingly. The increase in chlorophyll was observed after more than 12 hours illumination. Such results were paralleled with the formation of CP-complex in thylakoid membrane. Considering the low ability of CO₂-fixation compared with that of other sun-plants, different photosynthetic intermediates at early period, and activities of both glycolate oxidase and catalase, ginseng is more likely to be C₃-plant.
인삼엽(人蔘葉)의 엽록체발달(葉綠體發達)과 $CO_2$ 고정양상(固定樣相)에 관한 연구(硏究)
이순희,조영동,홍영남,권영명,Lee, Sun-Hi,Cho, Young-Dong,Hong, Young-Nam,Kwon, Young-Myung 생화학분자생물학회 1982 한국생화학회지 Vol.15 No.2
인삼엽의 greening과정중 엽록체발달(葉綠體發達), $CO_2$ 고정능(固定能), 초기(初期) 광합성(光合成) 중간대사산물(中間代謝産物), catalase와 glycolate oxidase 활성등을 조사(調査)하였고, 이러한 결과(結果)들은 CP-complex의 생성(生成)과 연관시켜 논의(論議)하였다. 엽록체발달양상(葉綠體發達樣相)은 타식물(他植物)과 같았으나 그 과정(過程)이 비교적 느렸고, 따라서 $CO_2$고정능(固定能)도 느렸다. 12시간 이상(以上) 빛을 조사(照射)하여야 엽록소양(量)이 증가하였다. 이러한 결과(結果)는 엽록체발달(葉綠體發達)에 따라 thylakoid막(膜)에서 CP-cmplex의 생성(生成)의 증가와 일치하였다. $CO_2$고정능(固定能)은 다른 양지식물(陽地植物)에 비하여 훨씬 낮았으며, 초기(初期) 광합성(光合成) 중간대사산물(中間代謝産物)의 변이(變異)와 glycolate oxidase 및 catalase 등의 활성(活性)으로 보아 인삼은 $C_3$-plant임을 추정할 수 있었다. Development of chloroplast, ability of $CO_2$-fixation, photosynthetic early intermediates and activities of catalase and glycolate oxidase were observed during greening process. Such results were discussed with the formation of CP-complex. The phenomenon of chloroplast development was similar to other plants, but the rate of process was relatively slow, and ability of $CO_2$-fixation was slow accordingly. The increase in chlorophyll was observed after more than 12 hours illumination. Such results were paralleled with the formation of CP-complex in thylakoid membrane. Considering the low ability of $CO_2$-fixation compared with that of other sun-plants, different photosynthetic intermediates at early period, and activities of both glycolate oxidase and catalase, ginseng is more likely to be $C_3$-plant.
생체생장에 관한 세포생물학적 연구 - 당근 뿌리의 원형질체에서 polyamine 과 Ca2+ 이 β - glucan synthetase 활성도에 미치는 영향
이순희(Sun Hi Lee),강영희(Young Hee Kang),표병식(Byoung Sik Pyo),조영동(Young Dong Cho),김명원(Myeong Won Kim),이준승(June Seung Lee) 한국식물학회 1987 Journal of Plant Biology Vol.30 No.3
The effect of polyamine, Ca^2+ and calmodulin on GS(β-glucan synthetase) activity was studied in Daucus carota root. The Ca^2+ is shown to have no effect on the GS activity wherease the GS Ⅱ activity is increase in response to increase in concentration of the Ca^2+. When the protoplasts are cultured, for 4 days, the GS Ⅱ activity increases as a tunction of time and reaches a maximum after 3 dyays at a time when the network of cellulose microfibrils is known to be synthesized. The effect of the Ca^2+ and 1 mM spermine on the GS Ⅱ activity turns out to be synergistic, especially more synergistic at lower concentration of the Ca^2+. The GS Ⅱ activity seems to be enhanced by the Ca^2+. The GS Ⅱ activity in the protoplast treated by the calcium channel blocker, verapamil, turns out to be lower than that of the control. Cumulative results suggest that the Ca^2+ stimulates the cell wall regeneration via enhancement of the GS Ⅱ activity responsible for synthesizing the cell wall component throught synergistic effect with spermine.
담배 현탁 배양세포에서 Ethylene 생합성에 미치는 Polyamine 의 작용기작 (作用機作)
이순희(Sun Hi Lee),박기영(Ky Young Park) 한국식물학회 1988 Journal of Plant Biology Vol.31 No.4
We investigated the activities of choline kinase, CTP: phosphorylcholine cytidyltransferase, and phosphatase during the greening of etiolated barley seedlings. Activities of choline kinase in leaves increasd until 6 hours after illumination and decreased considerably after 6 hours, while activities of CTP: phosphorylcholine cytidyltransferase increased after illumination. On the contrary, changes of these two enzymatic activities showed reverse pattern in roots. The activities of phosphatase which hydrolyze phosphorylcholine decreased in leaves but changed little in roots during greening. The concentration of phosphorylcholine increased in xylem exudate and in roots during greening, while decreased in leaves. These results suggested that more phosphorylcholine arrive in leaves from roots as greening of etiolated barley seedlings.
이순희(Sun Hi Lee),김성종(Seong Jong Kim),지전원휘(Motoki Ikeda) 한국식물학회 1990 Journal of Plant Biology Vol.33 No.3
Effects of blue and red light on photorespiration in the leaf disks of pea were studied. The rate of total ^14CO_2 fixation was more or less higher under red light than blue light irradiation of the same quantum (94.8 μEm^-2·S^-1/mV). The release of ^14CO_2 by photorespiration was more stimulated under blue than red light. Among the photorespiratory intermediates, ^14C was more incorporated into serine under blue light than red light. However, ^14C was more incorporated into glycine under red light than blue light. The incorporation of ^14C into glycolate was very low under both light qualities, but higher under red light than blue light. Among the enzymes related to photorespiration, only glycolate oxidase was activated and/or synthesized by blue light irradiation. Moreover, more ^14CO_2 was released from glycoate-1-^14C under blue light than red light irradiation, but ^14CO_2 release from glyoxylate-1-^14C and glycine-1-^14C showed no difference by the either light qualities. These results suggest that blue light is more effective in the photorespiratory CO_2 evolution than red light. The reason is considered that glycolate is easily metabolized under blue light due to the stimulation of the glycolated oxidase activity.
대두치엽의 (大豆稚葉) 분화에 미치는 질소 인산 가리의 영향
이순희 (Sun Hi Lee) 한국식물학회 1971 Journal of Plant Biology Vol.14 No.2
The present paper was designed to investigate the effect of nitrogen, phosphorus and potassium on the the histological differentiation of the young leaves of soybean (Glycine max, M.). Observations were made on the numbers of lamina cells and lateral veins, width and thickenness of the lamina and vascularization of the midrib in the 5th leaf, and the differentiation of leaves at 42μ from the apical tips of the shoot apecis. Samples were taken at the time when the 2nd leaf was completed. The experimental plots were divided into twelve parts. And the results obtained are as follows. 1) Nitrogen stimulated the differentiation of the leaf, the vascuralization of the midrib and increased the numbers of lamina cells and lateral veins. 2) Phosphorus promoted the differentiation of lamina at the first stage of soybean growth. It was more effective in the plots of excessive application than otherwise. It had a small effect on the differentiation of lateral veins. 3) Among the elements, a deficiency of potassium resulted in a reduced differentiation of the lamina potassium had no effect on the thickening growth of the lamina and the differentiation of the midrib. 4) It appeared that phosphorus might compensate for the negative effect of potassium in the potassium and phosphorus plots.
시금치 잎의 엽령에 (葉齡) 따라 분리한 Peroxisome 에서의 CO2 방출
이순희(Sun Hi Lee),이인철(In Cheol Lee),박기영(Ki Young Park),산전방웅(Yoshi Yamada) 한국식물학회 1988 Journal of Plant Biology Vol.31 No.3
The rates of photorespiration and total CO_2 fixation depending on leaf ages of spinach (Spinacia oleracea L.) were investigated. Metabolic rates of glycolate and glyoxylate in isolated peroxisomes were also measured. The rate of photorespiration and total CO_2 fixation ability increased with the maturing of leaf, but decreased with senescence. Activities of enzymes involved in the peroxisomal photorespiratory pathway such as catalase, glycolate oxidase, NADH-glyoxylate reductase and glutamate-glyoxylate transaminase were highest in the mature leaf, but also decreased with aging of leaf. Glutamate-glyoxylate transaminase activity significantly decreased with senescence, especially. The metabolic rate of glycolate was observed to be lower than that of glyoxylate in isolated peroxisomes. Glycolate seemed to be metabolized mainly to glycine, however, it also oxidized to CO_2 when glycolate was supplied as a substrate for glycine synthesis instead of glyoxylate. The conversion rates of glycolate and glyxylate into CO_2 increased with the senescence of leaves.
이순희(Sun Hi Lee),강영희(Young Hee Kang),진언선(Eon Seon Jin),조영동(Young Dong Cho),김명원(Myeong Won Kim),이준승(June Seung Lee) 한국식물학회 1987 Journal of Plant Biology Vol.30 No.4
The effect of polyamine and Ca^2+ on D-glucose-6-phosphate cyclohydrolase activity was studied in Daucus carota root. The enzyme activity was reduced in response to increase in concentration of Ca^2+, not the Ca^2+-calmodulin complex. The inhibition effect due to Ca^2+ was reversed by polyamine, especially remarkable at low concentration of Ca^2+. The effect of the Ca^2+ on the enzyme seemed to compete wth polyamine according to the Lineweaver-Burk plot. The enzyme activity from carrot root protoplast cultured in the prescence of verapamil was higher than that of the control. Such cumulative results suggest that the inhibition by the Ca^2+ and enhancement or reversal by polyamine could regulate the biosynthesis of pectin and hemicellulose to some extent.
이인철,이순희 ( In Cheol Lee,Sun Hi LEE ) 생화학분자생물학회 1985 BMB Reports Vol.18 No.4
Treatment of L-methionine sulfoximine (MSO), a specific irrevesible inhibitor of glutamine synthetase, caused about 60% inhibition of photorespiration in pea (Pisum sativum L.) leaf discs at a concentration of 2 mM. MSO also inhibited photosynthetic COz fixation, but inhibition rate was only about 4096 of control. There was increased incorporatation of ^(14)C into organic acids from CO₂ with MSO and decreased into amino acids and neutral fraction. Expecially, MSO increased the incorporation of ^(14)C into glyoxylate. However, ^(14)C of glycolate was lower level than that of control. These results showed that NH₃ released from photorespiration seemed to be reassimilated into glutamine by glutamine synthetase, and inhibition of photorespiration by MSO was chiefly caused by depression of photorespiratory nitrogen cycle.