• Ocean and Polar Research
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• 제30권3호
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• pp.277-287
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• 2008

We collected information on seasonal and interannual variability of surface chlorophyll a concentration between 1997-2007 from the Northwest Pacific Ocean. Satellite data were used to acquire chlorophyll a and sea surface temperature from six regions: East Sea/Ulleung Basin, East China Sea, Philippin Sea, Warm Pool region, Warm Pool North region, and Warm Pool East region. Mixed layer depth (MLD) was calculated from temperature profiles of ARGO floats data in four of the six regions during 2002-2007. In the East Sea/Ulleung Basin, seasonal variability of chlorophyll a concentration was attributed to seasonal change of MLD, while there was no significant relationship between chlorophyll a concentration and MLD in the Warm Pool region. Interannual anomaly in sea surface temperature were similar among the East Sea, East China Sea, Philippin Sea, and Warm Pool North region. The anomaly pattern was reversed in the Warm Pool East region. However, the anomaly pattern in the Warm Pool region was intermediate of the two patterns. In relation to chlorophyll a, there was a reversed interannual anomaly pattern between Warm Pool North and Warm Pool East, while the anomaly pattern in the Warm Pool region was similar to that of Warm Pool North except for the El $Ni\tilde{n}o$ years (1997/1998, 2002/2003, 2006/2007). However, there was no distinct relationship among other seas. Interestingly, in the Warm Pool and Warm Pool East regions, sea surface temperature showed a pronounced inverse pattern with chlorophyll a. This indicates a strong interrelationship among sea surface temperature-MLD-chlorophyll a in the regions. In the Warm Pool and Warm Pool East, zonal distribution of chlorophyll a concentration within the past 10 years has shown a good relationship with sea surface temperature which reflects ENSO variability.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.23-23
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• 2017

Rice (Oryza sativa L.) is the world's most important cereal crop. In crop plant, chlorophyll content and leaf senescence could affect grain filling and yield. We analyzed a QTL associated with chlorophyll content and delayed leaf senescence using high chlorophyll near isogenic line (HC-NIL). HC-NIL derived from a cross between Oryza sativa cv. Hwaseong as a recurrent parent and wild species O. grandiglumis as a donor parent showed higher chlorophyll content than Hwaseong. To identify QTL associated with chlorophyll content, 58 $F_3$ and 38 $F_4$ lines were developed from a cross between HC-NIL and Hwaseong. For QTL analysis, simple sequence repeat (SSR) markers were used for genotyping and one-way ANOVA was conducted. A QTL for chlorophyll content (qCC2) was detected in chromosome 2 and explained 24.63% of phenotypic variation. The senescence effect of the qCC2 was examined in dark-induced incubation (DII). Detached leaves from Hwaseong and HC-NIL were incubated on 3mM MES buffer (pH 5.8) at $27^{\circ}C$ under complete dark condition. After 3 days of incubation, the Hwaseong leaves turned yellow, but the HC-NIL leaves were green. HC-NIL has higher chlorophyll content with delayed senescence than Hwaseong. These results indicated that qCC2 is associated with stay-green phenotype. To know whether the qCC2 is responsible for leaf functionality, ion leakage test and Fv/Fm measurement were performed. Both experiment results showed that differences were observed between Hwaseong and HC-NIL but it was not statistically significant. These results might suggest that the qCC2 is possibly related to chlorophyll content and non-functional stay-green phenotype.

• 대한공간정보학회지
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• 제4권2호
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• pp.35-45
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• 1996

호수의 수질관리시 가장 중요한 수질인자 중의 하나인 클로로필의 반사도를 측정하여 가시광선과 근적외선 영역에서 클로로필의 파장별 반사특성을 파악하였고, 클로로필 반사도 스펙트럼에 TM데이터를 적용시켜 TM데이터만으로 클로로필 농도를 추정할 수 있는 변환식을 유도하였다. 또한 1995년 6월 20일과 1996년 3월 18일자의 LANDSAT TM데이터와 위성 통과시간에 대청호에서 측정한 클로로필의 상관관계로부터 회귀모델을 유도하여 대청호 전역의 영양상태 분포도를 작성하였고 계절에 따른 영양상태를 평가하였다.

• 농업생명과학연구
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• 제53권3호
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• pp.17-26
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• 2019

Chamaecyparis obtusa is one of the economical conifers planted in Korea due to its good quality timber and wood characteristics. Individuals of C. obtusa containing high terpenes (HT) and low terpenes (LT) were selected for by colorimetric method. The HT of C. obtusa was delayed in wilting against various abiotic stresses compared to the LT plants. The HT group exposed to UV did not significant influence the chlorophyll content, and the chlorophyll value was higher in the HT group than the LT group. Also, chilling treatment (5℃) did not significant influence on the chlorophyll content. However treatment at -4℃ showed relatively low chlorophyll content in the LT group than the HT group. Plants exposure to high temperature was not a difference between the HT and the LT group. However, treatment at 38℃ influenced the chlorophyll content that was increased exposure time-dependently. In salt treatments, chlorophyll in the HT group was lower at high concentrations (300 and 500 mM) of NaCl. However, chlorophyll content increased to slightly in treatment time-dependently, which is 6.7% to 40%. H2O2 treatment has been a negative effect on the chlorophyll content in the HT group. All concentration of H2O2 decreased the chlorophyll content of 5% to 35%. Plants containing high terpenoids were resisted against some abiotic stress such as salt and H2O2. Our results implied that terpenoids could cause various abiotic stress resistance. These results could be utilized for efficient management and biomass production during forest silvicultures.

• Journal of Photoscience
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• 제9권2호
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• pp.362-363
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• 2002

Since chlorophyll a and bacteriochlorophyll a are asymmetric molecules, an external ligand can coordinate to the central Mg atom either from the chiorin macrocycle side where the C13$^2$-methoxycarbonyl moiety protrudes (denoting as the 'back' side) or frome the other side (the 'face' side). We investigated which side of the macrocycle is favored for the ligand coordination, by survey of the highly resolved crystal structures of various photosynthetic proteins and theoretical model calculations. It is found that chlorophyll a as well as bacteriochlorophyll a and b in the photosynthetic proteins mostly bind their ligands on the 'back' sides. This finding was confirmed by the theoretical calculations for methyl chlorophyllide a and methyl bacteriochlorophyllide a as models: the 'back' type ligand-(bacterio )chlorophyll complex was more stable than the 'face' type one. The calculations predicted influence of the Cl3$^2$-stereochemistry on the choice of the side of the ligand coordination, which is discussed in relation to the presence of the Cl3$^2$-epimer of chlorophyll a in photosystem I reaction center [I].

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.1-3
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• 2003

In this study, spectroradiometer data were coupled with fluorometer data to find out the best suited bands ratio to monitor the chlorophyll a concentration for inland water. Remote sensing reflectance measurements were used to evaluate the performance of several default ocean color chlorophyll algorithms for SeaWiFS data. This study shows that the chlorophyll a concentration from fluorometer and reflectance from spectroradiometer lies in exploiting the signal provided by the chlorophyll a red absorption peak near 670nm. Two-band ratio based on a ratio of reflectance 670 and 700nm provided a good correlation for a linear model, compare with blue-green two band ratio.

• Journal of Plant Biology
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• 제14권1호
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• pp.15-23
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• 1971

The productivity of summer phytoplankton communities in Lake Hwajinpo, Lake Yongrang and Lake Changja were studied by measuring vertical variation of chlorophyll a amounts. The author also classified the lake types on the basis of the amount of chlorophyll in the lake water. And in Lake Changja, the seasonal changes of stratification of chlorophyll were studies. In Lake Hwajinpo, the productive structure of the phytoplankton community in summer was found to be L-shaped and of the mesotrophic type. In Lake Yongrang, the productive structure of the phytoplankton community in summer was alo L-shaped and of the mesotrophic type. And maximum chlorophyll layer was near the lake bottom below the compensation depth. In Lake Changja, the structure of phytoplankton community in summer was reversed L-shaped and of the eutrophic type, with the maximum chlorophyll layer just below the surface. The vertical distribution of chlorophyll amounts as a measure of the productive structure almost always formed a stratum distribution except in September and sometimes in May, in Lake Changja. In September homogeneous distribution was observed.

• 한국환경과학회지
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• 제2권4호
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• pp.279-289
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• 1993

자연광 및 여러 파장의 광선과 NAA, GA$_3$, BA 등의 식물호르몬을 옥수수 유식물에 처리하여 엽록소-단백질 복합체 형성에 미치는 효과를 조사하였다. 자연광하에서 3 종류의 호르몬 처리는 전체적으로 엽록소-단백질 복합체, 특히 LHCP-1과 LHCP-3의 형성을 촉진하였으나, 2 종류의 호르몬 조합은 엽록소-단백질 형성에 효과적이지 못하였다. LHCP-1, CPA 및 LHCP-3 등의 광계 II 관련 엽록소 형성에 있어서 백색광은 자연광에 비하여 효과가 적었으나 적색광은 효과적이었다. 적색광하에서 식물호르몬의 단독처리는 엽록체 발달 초기에 광계 II의 엽록소-단백질의 양적 증가를 유도하였다. 한편, 적색광하에서 2 종류의 호르몬 조합 처리도 자연광하에서의 처리와는 대조적으로 광계 II의 엽록소-단백질 형성에 매우 효과적이었다. 이와 같은 결과는 광선처리의 효과가 호르몬처리 효과보다 엽록소-단백질 복합체 형성에 중요한 인자로 작용한다는 것을 시사해 준다.

• 한국해양학회지
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• 제12권2호
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• pp.57-66
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• 1977

무기물에서 유기물을 생산하는 곳으로서 뿐만 아니라 인류의 마지막 식량공급처로서의 해양에 대한 기초생산의 중요성이 날로 높아져 국제인도양조사때나 Kuroshio해역조사때 생산력이 측정되었고 북서태평양(Sorokin and Koblentz-Miskke; 1958, Ichimura and Saijo; 1959, Saijo and Ichimura; 1960, Aruga and Monsi; 1962, 천촌;1963), 인도네시아 주변해역(Doty et al;1963)등에서도 기초생산이 측정된 바 있다. 일본의 주요 9개만에서는 월별측정(송평 등;1964)이 되었다. 우리 나라 연안에서는 최와 정(1966)이 $C^{14}$를 이용하여 광합성량을 측청하였고 Kang(1967) 은 수영만에서 계절별로 산소소모에 의한 광합성량을 측정했다.다.

• 기술사
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• 제18권4호
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• pp.12-22
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• 1985

This investigation was attempted to determine changes in chlorophyll. Pheophytin content PH and titratable acidity during young redish Kim chi fermentation. Young redishes divied in to leaf and vein and fermented in dark room for 35 days at 10$^{\circ}C$ after pickling each group. Samples were collected at 5 days interval for the chemical analysis. The following results were obtained. 1. Chlorophyll content in young redish was decreased by decreasing PH during fermentation periods. Chlorophyll content decreased from 11.60mg/g to 7.62mg/g in leaf, from 0.48mg/g to 0.33mg/g in vein respectively during 35 days fermentation periods. In contrast to chlorophyll. pheophytin content increased as chlorophyll content decreased during the period. The ratio of chlorophyll a and b content in young redish about 3 : 1 in leaf and vein and decreased nearly the same ratio during fermentation periods. In case of pheophytin a and b it was increased without any relation with the ratio chlorophyll a and b. In generally, the optimum PH for eating was known 4.3 to 5.0. Young redish Kim chi was reached the optimun PH at 15 to 25 days of fermentation at 10$^{\circ}C$. At this periods. Chlorophyll content varied from 11.32mg/g to 9.30mg/g for leaf and from 0.43mg/g to 3.37mg/g for vein, respectively. 2. Titratable acidity(as lactic acid) was increased to 0.54% in leaf at 20 days fermentation period during Kim chi fermentation. and nearly unchanged until 30days. At the end of fermentation period the titratable acidity was about 0.30％. Titratable acidity was increased as decreasing pH. and the correlation coefficients was -0.92 in leaf and -0.77 in Vien. 3. Correlation between titratable acidity and chlorophll, pheophytin content was not significant statistically.