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보리와 옥수수 잎의 생소 , 단백질 함량 및 광계 (光系) 2 활성에 미치는 SO2 의 영향
정화숙 (Hwa Sook Chung) 한국식물학회 1982 Journal of Plant Biology Vol.25 No.3
This investigation was carried out to clarify the changes of pigments and soluble protein, and photosystem Ⅲ activity in the leaves of barley (SO_2-sensitive) and corn (SO_2-resistant) seedlings induced by the SO_2 fumigation (10, 50ppm). The pH changes of the leaf extract, the content of sulfite and sulfate, the activities of catalase, peroxidase, and polyphenoloxidase were compared in the leaves of barley and corn seedlings induced by SO_2 fumigation. The results are summarized as follows; An appreciable effect of pH change of leaf extract by SO_2 fumigation was observed in barley leaves (pH 6.10 to 5.18), but only a small change occurred in corn leaves (pH 5.66 to 5.50). Ths same pattern of pH changes was recorded when the solution of 0.2N HCl was added to leaf extract, providing lower buffering capacity of the barley leaves than corn leaves. After 2 hours of exposure to 10ppm SO_2, the contents of SO^2-_3 and SO^2-_4 were increased in barley leaves, while only SO^2-_4 increased in corn leaves. After fumigation with 10ppm SO_2 for 2 hours, barley leaves showed significant decreases in activities of caralase, to 17% peroxidase, to 58%, and polyphenoloxidase, to 88%. Corn leaves showed increases in activities of peroxidase, to 136%, and polyphenoloxidase, to 128%. Absorption spectra of pigments obtained from SO_2-fumigated leaves were gradually decreased with the fumigation time increases, but the decrease was more significant in barley leaves. Fumigation with 50ppm SO_2 for 2 hours induced the greatest decomposition in carotenoid, followed by chlorophyⅡ a and then chlorophyⅡ b in barley leaves. The ratio of chlorophyⅡa/b was decreased from 4.1 to 3.6 in barley leaves, but in corn leaves it was maintained almost a constant level (4.9-4.8). The rate of decomposition of chlorophyⅡ and carotenoid in corn leaves was very slow than those in the barley leaves. Fumigation with 50 ppm SO_2 for 2 hours, decreased the protein content of barley leaves to 59%, and that of corn leaves to 89%, and the extent of decrease in protein content was greater than that of pigments in barley and corn leaves. The rate of DCIP(dichlorophenol indophenol) photoreduction in SO_2-fumigated leaves was decreased to 18 and 67% in barley and corn leaves, respectively. However, DCIP photoreduction was considerably recovered about 32 and 92% with the addition of DPC(diphenylcarbazide) as an exogenous electron donor in barley and corn leaves, respectively.
오존이 보리 ( Hordeum vulgare L. ) 엽록체의 광합성 활성에 미치는 영향
박강은(Kang Eun Park),정화숙(Hwa Sook Chung),송승달(Seung Dal Song),노광수(Kwang Soo Roh),송종석(Jong Suk Song) 한국식물학회 1995 Journal of Plant Biology Vol.38 No.4
The effects of 0.5 and 1.0 ppm of ozone on the developing chloroplast of barley (Hordeum vulgare L.) seedling during greening were investigated by PSⅠ and Ⅱ activities, chlorophyll fluorescence, and the contents of chlorophyll. Etiolated barley seedling was treated 0.5 and 1.0 ppm ozone for the first 4 h during greening. In 24 h greening experiment, the contents of chlorophyll were decreased by increasing ozone concentration from 0.5 ppm to 1.0 ppm. In 24 h greening experiment, Fo, Fv, Fm and qE were greatly decreased as the concentration of ozone was increased, but those were not considerably decreased in 48 h greening experiment. In another experiment, the developing barley seedling was treated with 0.5 and 1.0 ppm ozone for the last 4 h during greening period, which was 24 h or 48 h. In both experiments the PS Ⅱ activity was decreased as the concentration of ozone was increased, but not in PS Ⅰ activity. Fv, Fm and Fv/Fo were also decreased as the concentration of ozone was increased. qP and qR were strikingly decreased as the concentration of ozone was increased in both experiments.
시금치 엽록체의 광합성 전자전달 활성에 미치는 Cd2+ 의 저해 효과
박강은(Kang Eun Park),정화숙(Hwa Sook Chung) 한국식물학회 1994 Journal of Plant Biology Vol.37 No.2
The effect of Cd^2+ on the electron transport rate of PSⅠ and PSⅡ was investigated in isolated spinach chloroplasts. In photosystem Ⅱ, the rate of electron transport was decreased as the concentration of Cd^2+ was increased from 1 to 100 μM. The inhibitory effect of Cd^2+ was reduced when diphenylcarbazide was added to the reaction medium, indicating that Cd^2+ affects primarily PSⅡ oxygen evolving complexes of thylakoid membrane. The inhibitory effect of Cd^2+ was reduced when Mn^2+ and Ca^2+ were added to the reaction medium, but the inhibitory effect was not fully relieved. Although the activity of PSⅡ was decreased significantly by the treatment of 50 μM Cd^2+, Fv/Fm was decreased slightly. However, the treatment of 100 μM Cd^2+ resulted in the marked decrease of Fv/Fm. In hotosystem Ⅰ, the rate of electron transport decreased as the concentration of Cd^2+ was increased from 0.2 to 3.2 mM. The inhibitory effect of Cd^2+ was decreased when the chloroplast treated with Cd^2+ was washed by centrifugation.
산성 전해수가 보리 (Hordeum vulgare L.) 엽록체의 발달에 미치는 영향
정화숙,송승달,노광수,송종석,박강은 한국환경과학회 1999 한국환경과학회지 Vol.8 No.2
To investigate the effects of strong acidic electrolytic water on the chloroplast, barley leaves were treated with strong acidic electrolytic water(pH 2.5). And to investigate the effects of weak acidic electrolytic water on the chloroplast development, etiolated barley leaves were treated with weak acidic electrolytic water(pH 6.5) during greening period. Chl contents, Fo, Fv, and Chl fluorescence quenching coefficient in barley leaves were measured during and after treatment of acidic electrolytic water. The following results were obtained. Chl a, b, and carotenoid were decreased with treatment of strong acidic electrolytic water. Chl contents were significantly decreased than that of the control after 5 min. These results provide evidence that the strong acidic electrolytic water dissimilate the Chl and so that the value of Fo was slightly increased. The strong acidic electrolytic water damaged PS Ⅱ because Fo was increased and Fv, Fm, and Fv/Fm ratio were decreased. qP, qNP and qE were decreased. On the other hand qI was increased than that of the control. But Chl content and Chl fluorescence patterns were a little changed as the pH increase over 4.0. Chl a, b, and carotenoid were increased with treatment of weak acidic electrolytic water during greening period. Chl contents were significantly increased than that of control after 12 hours greening. These results provide evidence that the weak acidic electrolytic water accelerated the chlorophyll synthesis. And the weak acidic electrolytic water accelerated PS Ⅱ development because Fv, Fm, qP and Fv/Fm ratio were increased than that of the control.
Alcohol류가 시금치(Spinacia oleracea L.)잎의 색소, 광계 Ⅱ 활성 및 엽록소-단백질 복합체에 미치는 영향
鄭華淑 慶北大學校 師範大學 1989 敎育硏究誌 Vol.31 No.-
Effect of different alcohols on spinach(Spmacia oleracea L.) leaves in the light and dark was investigated to clearify the changes of pigments contents and soluble protein, PS Ⅱ activity and CP-complex. Spinach leaves were treated with different alcohols at different concentrations and illuminated at 5,000 lux and placed in darkness at 25℃ for 24 hours. Under the light condition pigments contents and soluble protein content were gradually reduced with the increase of alcohols concentration, but not in darkness. The stomata of spinach leaf epidermis were markedly opened with treatment of alcohols in darkness. Alcohols treatment either in light or darkness markedly decline of DCIP photoreduction rate with the increase of alcohols concentrations.