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Mannose 처리된 배추 잎의 무기인산 감소에 따른 비광화학성 소산의 증가
박연일(Youn Il Park),서계홍(Kye Hong Suh),홍영남(Young Nam Hong) 한국식물학회 1991 Journal of Plant Biology Vol.34 No.4
Limitation of photosynthesis in detached Chinese cabbage (Brassica campestris L.) leaves was induced by feeding of mannose (25 mM) for 12 h in the light, and changes in the basic thylakoid functions under this condition were investigated. The acid soluble phosphate content and CO_2 uptake rate was decreased by 66% and 67%, respectively. However, the starch content was increased by 24% compared to those of controls. From the fast induction curves of chlorophyll fluorescence, dark level fluorescence (F_O) slightly increased while intermediate plateau fluorescence level (F_I) to peak level fluorescence (F_P) transient was significantly decreased with a slight decrease in the F_O-to-F_I transient. This data means that reduction of secondary electron acceptor of PSⅡ (Q_B) might be more severely inhibited than that of primary electron acceptor of PSⅡ (Q_A) by decrease in phosphate level. The strong decline of (F_V)_m//F_m ratio suggests that efficiency of excitation energy capture by PSⅡ was decreased markedly. The quenching of F_O (qO), an indicator of state transition, was also occurred over the slow induction kinetics of chlorophyll fluorescence. From quenching analysis, fluorescence was dominantly quenched by nonphotochemical quenchings (qE+qT). These results showed that the capture and transfer efficiency of excitation energy to PSⅡ reaction center in thylakoid was decreased with the decline of leaf phosphate level, and that the state transition was occurred during the induction of photosynthesis under these conditions.
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고온 스트레스를 받은 밀 엽록체에서 광합성능과 엽록소 형광의 관계
박연일(Youn Il Park),박민철(Min Chul Park),홍영남(Young Nam Hong) 한국식물학회 1994 Journal of Plant Biology Vol.37 No.1
Correlative changes between photosynthetic O_2 exchange rates and room temperature Chl fluorescence were investigated in wheat (Triticum aestivum L.) chloroplasts treated with high temperature for 5 min. With increaseing treatment temperature, photosynthetis O_2 evolution rate mediated by PSⅡ was decreased, showing 50% inhibition at 38℃ (Ⅰ_50). But PSⅠ activity measured by O_2 uptake rates was stimulated as a function of increasing temperature. Dark level fluorescence (Fo)-temperature (T) analysis showed that florescence rising temperature( T_r), critical temperature (T_c), and peak temperature (T_p) was 38, 43, and 52℃, respectively. Quenching analysis of Chi fluorescnece showed that both the oxidized fraction of plastoquinone (qQ) and the degree of thylakoid membrane energization (qNP) increased up to 40℃ and then declined dramatically. These results suggest that T_r is correlated with temperature showing a 50% inhibition of photosynthesis and under mild high temperature stress, qNP is worth regarding as indicator for heat-induced damage of photosynthesis.
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청록색광에 색성적응된 Anacystis niduland 의 상전이 증가
박연일,양덕조,홍영남 ( Youn Il Park,Duck Jo Yang,Young Nam Hong ) 생화학분자생물학회 1994 BMB Reports Vol.27 No.2
Photoacclimation of Anacystis nidulans toward blue-green light was investigated in terms of sensitivity of state transition. Ratio of phycobilin/chlorophyll and maximal photosynthetic rates of A. nidulans grown in blue-green light increased 7.6 and 1.5 times as large as those of white light-grown cells, respectively, but there was no apparnnt change in the energy transfer efficiency from phycocyanin to chlorophyll. The magnitude of state transition of blue-green light grown cells under preferential excitation of photosystem I by red light ($gt;630 ㎚) was increased by 38% in comparision with that of white-light grown cells. Uncoupler, m-chlorophenylhydrazone, and protein kinase inhibitor, 5`-p-fluorosulfonylbenzoyladenosine, severely inhibited the state 2 transition, but ATP synthase inhibitor, N,N`-dicyclohexylcarbodiimide, did the state 1/2 transitions. These results suggest that state transition in A. nidulons should be regulated by redox state of plastoquinone, and photoacclimation to blue-green light is related to the increased senstitivity of state transition.
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고온 스트레스가 Anacystis nidulans 의 광합성에 미치는 영향
박연일,양덕조,홍영남 ( Youn Il Park,Duck Jo Yang,Young Nam Hong ) 한국하천호수학회 1993 생태와 환경 Vol.26 No.1
4Effects of high temperature stress on the photosynthesis of Anacystis nidulans were investigated by using the measurements of oxygen exchange rates and room temperature chlorphyll fluorescence. With increasing pretreated-temperature for 5 min, oxygen evolution rates of A. nidulans were increased up to 50˚C , and then rapidly decreased. Especially, the oxygen evolution rates were inhibited by 50˚C(I_50) at 53˚C. These inhibition of photosynthesis by high temperature were caused by the restrictions of PS II activites. Hydroxylamine could not restore the oxygen evloution rates of PS II in A. nidulans pretreated with high temperature at 53˚C for 5 min. Ca^2+ pretreatment before temperature treatment for 5 min at 53˚C prevented PS II function from high temperature stress. Constant fluorescence level(Fo)-temperature curves showed the increase of F_O level with increaing heating temperature. However, Ca^2+ prevented increase of F_O from heat treatment. From the analysis of fast induction kinetics of room tenpe-rature chlorophyll fluorescence, F_O level was increased by 79%, but variable fluroescence(Fv) was declined by 24% in 53˚C treated A. nidulans as compared to controls. Ca^2+ pretreatment also inhibited both the increase of F_O and the decrease of Fv levels induced by high temperature stress. Frnm above results, it was concluded that the inhibition of PS II function in A. nidulans by high temperature stress was resulted from the restrictions of PS II reaction center rather than the malfunction of oxygen evolution complex or the strucutral changes of photosyntheic thyakoid membranes.
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