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차나무(Camellia sinensis L.) 잎의 엽록소형광 특성과 CO₂ 고정능
오순자(Soonja Oh),이진호(Jin-ho Lee),고광섭(Kwang-Sup Ko),고석찬(Seok Chan Koh) 한국차학회 2013 한국차학회지 Vol.19 No.1
본 연구는 제주지역 다원에서 재배하는 차나무(Camellia sinensis L.)의 잎에서 엽록소형광 특성과 CO₂ 고정능의 일주기 변화를 측정하고 잎의 성숙도에 따라 비교 분석하였다. 광계II의 광화학적 효율(Fv/Fm)은 낮 시간에 다소 감소하고 저녁에는 원래 상태로 회복되었다. 이는 여름철 고광에 의해 차나무 잎의 광계II 반응중심이 저해를 받지만 고광에 적응하고 있음을 의미한다. 광계II의 에너지 흐름을 나타내는 변수들 중에서 RC/CS는 모든 생장단계에서 낮 시간에 감소하는 반면에, ABS/RC, TRo/RC, ETo/RC와 DIo/RC는 모든 생장단계에서 낮 시간에 증가하였다. 차나무의 엽면적당 CO₂ 고정률(A)의 일변화는 2개의 peak를 갖는 패턴을 보였다. 하지만, 최대 CO₂ 고정률은 잎의 생장단계별로 차이를 보여 여름 잎은 오전의 최대값이 9.41-9.67 µmol/㎡/s로 오후의 6.13 µmol/㎡/s에 비하여 훨씬 크고, 봄 잎은 오전과 오후에 각각 8.19 µmol/㎡/s와 8.03 µmol/㎡/s로 유사한 값을 나타내었다. CO₂ 고정률(A)은 여름 잎에서만 온도와 1% 수준에서 유의한 음의 상관관계를 보였으며, 습도와는 여름 잎과 봄 잎에서 각각 1%와 5% 수준에서 유의한 정의 상관관계를 보였다. 그리고, CO₂ 고정률(A)은 기공전도도(gs)나 증산률(E)과는 모든 생장단계에서 1% 수준에서 유의한 정의 상관관계가 인정되었다. CO₂ 고정률의 일변화를 토대로 산출한 일동화량은 여름 잎과 봄 잎에서 각각 312.8 mmol/㎡/d와 320.1 mmol/㎡/d로 서로 유사하며 1년 이상의 잎(281.6 mmol/㎡/d)에서 보다 높았다. Abstract The diurnal change in chlorophyll fluorescence and the CO₂ fixation capacity were examined in the leaves of tea plants (Camellia sinensis L.) under field conditions in summer. The photochemical efficiency of photosystem II (Fv/ Fm) was slightly lower at mid-day compared to the level at dawn or dusk. On the other hand, there was only a slight difference between the leaves at different developmental stages, and the decline in Fv/Fm at mid-day recovered at dusk. This suggests that C. sinensis acclimatizes to high levels of radiation under natural conditions in summer, even though the photosystem II reaction center was inhibited. In the energy flux through photosystem II, RC/CS was reduced significantly at mid-day in the leaves at all developmental stages, whereas ABS/RC, TRo/RC, ETo/RC, and DIo/RC in the leaves increased at mid-day at all developmental stages. The diurnal variation in the CO₂ fixation rate (A) showed a pattern with double peaks due to the mid-day depression, even though the maximum values differed slightly depending on the developmental stages of the leaves. This was negatively correlated with temperature only in the summer leaves and positively correlated with humidity in the spring and summer leaves. In addition, it also correlated positively with the stomatal conductance (gs) and transpiration rate (E). The daily CO₂ fixation capacity was higher in the summer (312.8 mmol/㎡/d) and spring (320.1 mmol/㎡/d) leaves than in the leaves more than 1 year old (281.6 mmol/㎡/d), suggesting that young leaves fix CO₂ more efficiently than old leaves.
대기 중 CO<sub>2</sub> 상승 조건에서 재배되는 콩의 광합성과 생장 반응의 분석
오순자 ( Soonja Oh ),고석찬 ( Seok Chan Koh ) 한국환경과학회 2017 한국환경과학회지 Vol.26 No.5
The effects of elevated atmospheric CO<sub>2</sub> on growth and photosynthesis of soybean (Glycine max Merr.) were investigated to predict its productivity under elevated CO<sub>2</sub> levels in the future. Soybean grown for 6 weeks showed significant increase in vegetative growth, based on plant height, leaf characteristics (area, length, and width), and the SPAD-502 chlorophyll meter value (SPAD value) under elevated CO<sub>2</sub> conditions (800 μmol/mol) compared to ambient CO<sub>2</sub> conditions (400 μmol/mol). Under elevated CO<sub>2</sub> conditions, the photosynthetic rate (A) increased although photosystem II (PS II) photochemical activity (F<sub>v</sub>/F<sub>m</sub>) decreased. The maximum photosynthetic rate (A<sub>max</sub>) was higher under elevated CO<sub>2</sub> conditions than under ambient CO<sub>2</sub> conditions, whereas the maximum electron transport rate (J<sub>max</sub>) was lower under elevated CO<sub>2</sub> conditions compared to ambient CO<sub>2</sub> conditions. The optimal temperature for photosynthesis shifted significantly by approximately 3°C under the elevated CO<sub>2</sub> conditions. With the increase in temperature, the photosynthetic rate increased below the optimal temperature (approximately 30°C) and decreased above the optimal temperature, whereas the dark respiration rate (R<sub>d</sub>) increased continuously regardless of the optimal temperature. The difference in photosynthetic rate between ambient and elevated CO<sub>2</sub> conditions was greatest near the optimal temperature. These results indicate that future increases in CO<sub>2</sub> will increase productivity by increasing the photosynthetic rate, although it may cause damage to the PS II reaction center as suggested by decreases in F<sub>v</sub>/F<sub>m</sub>, in soybean.