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Regulation of Photosynthesis during Abiotic Stress-Induced Photoinhibition

Molecular Plant 2015年第9期8卷 1304-1320页

作者： Mayank Anand Gururani Jelli Venkatesh Lam-Son Phan Tran School of Biotechnology Yeungnam University Gyeongsan Gyeongbook 772-749 Korea Department of Bioresource and Food Science Konkuk University Seou1143-701 Korea Signaling Pathway Research Unit RIKEN Center for Sustainable Resource Science 1-7-22 Suehiro-cho Tsurumi Yokohama Kanagawa 230-0045 Japan

Plants as sessile organisms are continuously exposed to abiotic stress conditions that impose numerous detrimental effects and cause tremendous loss of yield. Abiotic stresses, including high sunlight, confer serious damage on the photosynthetic machinery of plants. Photosystem II （PSII） is one of the most susceptible components of the photosynthetic machinery that bears the brunt of abiotic stress. In addition to the generation of reactive oxygen species （ROS） by abiotic stress, ROS can also result from the absorption of excessive sunlight by the light-harvesting complex. ROS can damage the photosynthetic apparatus, particularly PSII, resulting in photoinhibition due to an imbalance in the photosynthetic redox signaling pathways and the inhibition of PSII repair. Designing plants with improved abiotic stress tolerance will require a comprehensive understanding of ROS signaling and the regulatory functions of various components, including protein kinases, transcription factors, and phytohormones, in the responses of photosynthetic machinery to abiotic stress. Bioenergetics approaches, such as chlorophyll a transient kinetics analysis, have facilitated our understanding of plant vitality and the assessment of PSII efficiency under adverse environmental conditions. This review discusses the current understanding and indicates potential areas of further studies on the regulation of the photosynthetic machinery under abiotic stress.

关键词： abiotic stress chlorophyll a fluorescence hormones light-harvesting complex photosynthesis

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Feasibility Analysis of MERIS as a Tool for Monitoring Lake Guiers (Senegal) Water Quality

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Journal of Water Resource and Protection 2016年第1期8卷 100-119页

作者： Seybatou Diop Souléye Wade Moshood N. Tijani Institute of Earth Sciences Faculty of Sciences and Techniques Cheikh Anta Diop University of Dakar Dakar Senegal Department of Geology University of Ibadan Ibadan Nigeria

ENVISAT/MERIS scenes of Lake Guiers covering the period 2003-2010 were processed for concentration retrieval of chlorophyll a (CHLa), suspended particulate matter (SPM) and colored fraction of dissolved organic matter (CDOM), i.e. the three main parameters relevant to the water quality management of the lake. Estimates in the range of 30 - 117 μg CHLa L-1 (average 62.13 μg·L-1), 0.10 - 29.0 mg SPM L-1 (average 22.01 mg·L-1), and 1.10 - 1.90 CDOM m-1 (average 1.33 m-1) were recorded, suggesting the possibility of occasional poor quality waters in some compartments of the lake. The values calculated as part of this study are consistent with literature data. On the basis of these estimates, interpretations were made as to the feasibility of applying MERIS data for synoptic environmental monitoring purposes. The data were subjected to statistical analysis, including regression analysis and significance tests. Estimates of CHLa and CDOM revealed some level of correlation, which suggests that phytoplankton biomass degradation may account for nearly 47% of the dissolved optical compounds CDOM. Notable areas of high CHLa and CDOM concentrations are found in the southern inshore zone, an environment with less water agitation. In contrast, SPM concentrations tend to increase in environments of very shallow water marked by high water turbulence and bottom mobility. However, it was not possible to fully assess the model performance and detection accuracy of the results due to lack of ground truths. Nonetheless, the results show concentrations that compared well with the insitu data from earlier studies and data reported elsewhere from other lacustrine systems. Therefore, it can be inferred from this study that MERIS data present a useful low-cost (i.e. cost effective and readily available) approach for environmental monitoring of Lake Guiers waters with excellent spatial coverage. In addition, the study highlight

关键词： Lake Guiers MERIS Environmental Monitoring Water Quality chlorophyll a Suspended Particulate Matter Colored Dissolved Organic Matter

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Vertical　distribution　and　seasonal　variation　in　ice　algae　biomass　in　coastal　sea　ice　off　Zhongshan　Station，　East　Antarctica

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Chinese Journal of Polar Science 1996年第2期7卷 150-163页

作者：何剑锋陈波

the biomass of ice algal communities in coastal sea ice off zhongshan Station, antarctica were monitored from april to december 1992. The maximum Thickness of ice cover was 1. 74 m in november/december and covered-snow was less than35 cm in depth throughout the study period. Brown layers occurred in 2～5 cm of theIce bottom in late april and november, with chlorophyll a peak values of 360. 7 and2810 mg/m3 respectively. The integrated chlorophyll a values ranged from 1. 17 to59. 7 mg/m2 with the peak occurring in november when ice algae bloomed, and theValues never exceeded 6 mg/m2 before mid october except at one site, the highest valueOccurred in april and then decreased nuctuatedly throughout the year. The biomassWas concentrated mainly in the bottom of the ice, and might be also partly concentratedIn the interior sections where autumn bloom had occurred. The dominant diatoms wereComposed of nitzschia lecointei, n. Barkleyi, n. Cylindrus in austral autumn and Amphiphiprora kjellmanii, berkeleya rutilans, nitzschia lecointei in austral spring, andShowed some difference at sites owing to the environmental conditions.

关键词： antarctica fast ice ice algae chlorophyll a biomass seasonal Variation.

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Distribution of Sediment Chloroplastic Pigments in the Southern Yellow Sea,China

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Journal of Ocean University of China 2005年第2期4卷 163-172页

作者： LIUXiaoshou ZHANGZhinan WUYiping HUANGYong ZHANGYan CollegeofMarineLifeSciences OceanUniversityofChinaQingdao266003P.R.China CollegeofMarineLifeSciences OceanUniversityofChinaQingdao266003P.R.China／／AgriculturalCollegeLiaochengUniversityLiaochengShandong252000P.R.China

The distribution of sediment chloroplastic pigments (Chl-a, i.e. chlorophylla and Pha-a, i.e. phaeophorbide a) in the Southern Yellow Sea of China was studied. Samples werecollected from four cruises in January and June 2003, and January and June 2004. The results showthat the vertical distribution of Chl-a and Pha-a in the sediment layers 0-2cm, 2-5cm and 5-8cm,follows a stable ratio, 5:3:2. The average ratio of Pha-a to Chl-a in sediment is 2.83. Spearman2-tailed rank correlation analysis shows that Chl-a and Pha-a contents in each sediment layer have ahighly significant correlation. The average contents of Chl-a and Pha-a in the sediment of the0-8cm layer in the investigated area are 0.31-0.47 μg g^(-1) and 1.28-1.40 μg g^(-1) sediment (dryweight), respectively. The average Chl-a and Pha-a contents in sediment are higher in summer thanin winter. ANOVA analysis shows that there is a highly significant variation among the Chl-acontents (P = 0.002 0.05). The average Chl-a and Pha-a contents in the 2 sediment layers (0-2cm and 2-5cm)have significant or highly significant correlations with organic matter (OM), median diameter(Md_φ), silt plus clay percentage in the January 2003 cruise. In the June 2003 cruise, the averageChl-a content in the 3 sediment layers (0-2cm, 2-5cm, and 5-8cm) has a significant correlation withmeiofauna biomass, and Pha-a content has highly significant correlations with water depth, bottomwater temperature, OM and Md_φ. The contents of Chl-a and Pha-a are lower than those in estuariesand intertidal areas, but close to those in the same area studied previously.

关键词： Southern Yellow Sea sediment chlorophyll a phaeophorbide a distribution

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Phytoplankton Productivity and Hydrology in an Impacted Estuarine Complex in Northeastern Brazil

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Open Journal of Ecology 2019年第10期9卷 458-477页

作者： Laisa Madureira da Silva Fernando Antonio do Nascimento Feitosa Manuel de Jesus Flores Montes Amanda Yumi Otsuka Flavia Saldanha-Correa Carlos Noriega Oceanography Department Federal University of Pernambuco—UFPERecifeBrazil Oceanographic Institute of the University of So Paulo University of So Paulo—USPSo PauloBrazil

The aim of the current study was to evaluate the productive capacity of the phytoplankton community and other environmental variables in the estuarine area of Suape;while considering the constant morphological, sedimentological and hydrological changes, the site has been facing due to the implementation and expansion of an industrial and port complex. The study comprised 6 campaigns: 3 in the dry season and 3 in the rainy season. Water samples were collected from the surface layer of the internal and external portions of the estuarine bay during low spring tides. The salinity ranged from 32.20 to 37.10, the water temperature ranged from 26.60°C to 29.40°C, and the oxygen saturation rate ranged from 58.5% to 114.5%. There was significant seasonal variation. The nitrite concentration was higher during the rainy season, whereas the ammonia concentration was higher during the dry season;the higher ammonia concentration helped increase chlorophyll-a levels and rates of primary productivity, which ranged from 0.02 - 2.45 mg·m−3 and from 0.34 to 4.32 mg·C·m−3·h−1, respectively. chlorophyll-a a-containing biomass, and this reflected the low nutrient content in the water and indicated that the area was free from eutrophication processes. The decrease of rainfall during the sampling months and the anthropogenic changes in the environment led to reduced continental contributions, increased marine interference, nutrient dilution and loss of phytoplankton production capacity in Suape Bay, which severely damaged other trophic links in the ecosystem.

关键词： Estuarine Area Phytoplankton Primary Productivity chlorophyll a Suape Bay

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Identification and Fine Mapping of a Gene Related to Pale Green Leaf Phenotype near the Centromere Region in Rice(Oryza sativa)

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Rice science 2007年第3期14卷 172-180页

作者： ZHU Li LiuWenzhen WU Chao LUAN Wei jiang Fu Ya ping Hu Guo cheng SI Hua min SUN Zong xiu State Key Laboratory of Rice Biology China National Rice Research InstituteHangzhou310006China

A thermo-insensitive pale green leaf mutant （pgl2） was isolated from T-DNA inserted transgenic lines of rice （Oryza sativa L. subsp, japonica cv. Nipponbare）. Genetic analysis indicated that the phenotype was caused by a recessive mutation in a single nuclear-encoded gene. To map the PGL2gene, an F2 population was constructed by crossing the mutant with Longtefu （Oryza sativa L. subsp, indica）. The PGL2 locus was roughly linked to SSR marker RM331 on chromosome 8. To finely map the gene, 14 new InDel markers were developed around the marker, and PGL2 was further mapped to a 2.37 Mb centromeric region. Analysis on chlorophyll contents of leaves showed that there was no obvious difference between the mutant and the wild type in total chlorophyll （Chl） content, while the ratio of Chl a / Chl b in the mutant was only about 1, which was distinctly lower than that in the wild type, suggesting that the PGL2 gene was related to the conversion between Chl a and Chl b. Moreover, the method of primer design around the centromeric region was discussed, which would provide insight into fine mapping of the functional genes in plant centromeres.

关键词： centromere gene fine mapping pale green leaf mutant chlorophyll a chlorophyll b rice

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Physico-Chemical Analysis of Eutrophication’s Parameters in a Coastal River(Cote D’ivoire)

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Journal of Environmental Protection 2014年第13期5卷 1285-1293页

作者： Koffi Sebastien Ouffoue Moreto Salla Denis Yapo Kicho Dodiomon Soro Kouhete Philippe Da Zanahi Felix Tonzibo Laboratoire de Chimie Organique U.F.R.SSMTUniversite Felix Houphouet-BoignyAbidjanCote d’Ivoire Centre Ivoirien Anti-Pollution(C.I.A.POL.) AbidjanCote d’Ivoire Laboratoire de Botanique U.F.R.BiosciencesUniversite Felix Houphouet-BoignyAbidjanCote d’Ivoire

A study on some physico-chemical and biological variables of water quality was conducted on a coastal river in Ivory Coast. It’s the first assessment on water quality state. Those coastal rivers actually play an important role in the physical, biological and hydrological exchange between lagoons and the sea. Unfortunately, they are not taken into account by the national monitoring for water quality (RNO-CI). The samples were collected along Boubo River body through three stations, in the south of Cote d’Ivoire, during two years. Results show sharp fluctuations of the concentration N-NO3- nitrate, N-NH4+ ammonium and chlorophyll a with more than 20% variation. However, small fluctuations were noted for temperature, pH and conductivity with 4% - 20%. Measures are generally inferior to the threshold for hazardous water class. But respective average concentrations of N-NO3-, P-PO43-, COD and BOD5 are above natural water threshold, representing 67% of the analyzed samples of P-PO43- and 100% of the other. These results show that the river is not exempt of pollution: 0.2 mg/l of P-PO43- and 0.9 mg/l of N-NO3- are the limits of appropriate siege for the proliferation of invasive aquatic plants (IAP).

关键词： Water Quality Nutriments chlorophyll a Pollution Eutrophication River Cote d’Ivoire

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Increasing the Protein Amount of Chlorella vulgaris [Chlorphyta] Strains Isolated from Different Fresh Water Ponds

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Journal of Environmental Science and Engineering(B) 2017年第4期6卷 201-208页

作者： Dilek Yalcin Duygu Department of Biology Education Gazi University Ankara 06530 Turkey

Chlorella vulgaris is a single-cell, spherical green algae and one of the microalgae on which many applied studies are conducted. In the present study, five strains displaying fast and efficient reproduction were chosen among 11 C. vulgaris strains isolated from different fresh water ponds and their cell numbers and the amount of chlorophyll a, protein, lipid, cellulose and carbohydrate were examined. The main goal of the study is to investigate increasing the biochemical contents especially the protein content of C. vulgaris strains in different mediums. In the present study, cell densities were determined through cell count for five days. In parallel with cell count, their chlorophyll a content was determined. The highest cell density was observed with C. vulgaris TOH （Tourism and Hotel Management Pond） strain as 5.5 × 104 h/mL, and the chlorophyll a content as 4.3 × 102 mg/m3. The highest intracellular protein amount was determined with C. vulgaris GUH （Gazi University Rectorship Pond）（0.061 g/100 mL） and the highest lipid amount was attained with C. vulgaris UIK （Ulus Construction Well） strain as 0.019 g/100 mL. The process of increasing the intracellular protein amount in C. vulgaris GUH strain was carried out in Prat, Yagojinski and Chlorella medium. The results indicated that Chlorella medium increased the intracellular protein amount.

关键词： Chlorella vulgaris chlorophyll a microalgae biomass biochemical analysis

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Investigation on Filtration Rate and Subsequent Nutrient Removal by Green Mussel Perna viridis

Investigation on Filtration Rate and Subsequent Nutrient Rem...

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2012年环境污染与大众健康学术会议

作者： Chayarat Tantanasarit, Sandhya Babel Environmental Technology Program, School of Biochemical Engineering and Technology Sirindhorn International Institute of Technology (SIIT), Thammasat University Pathum Thani, Thailand

Green mussels （Perna viridis） effectively clean coastal waters by removing nutrients from seawater through phytoplankton consumption. This investigation evaluates green mussel filtration rates and attempts to correlate these with the amount of phytoplankton consumed by kinetic modeling. Results can assist in under-standing nutrient removal rates by estimating carbon, nitrogen and phosphorus contents in the phytoplankton cells. Two ranges of mussel size （2.8-3.0 and 6.8-7.0 cm） were selected and individually cultured in filtered seawater. Pure cultures of the unicellular diatom Chaetoceros calcitrans （C. calcitrans） were added and chlorophyll a concentration was monitored as C. calcitrans cells remaining. Seawater volumes were varied to yield 0.5, 1, 5 and 10 L/mussel. C. calcitrans cells were analyzed for CNP content. Results indicated that the filtration behaviors of both small and large mussels were found to be similar. The increase in seawater volume per g DW tissue resulted in higher filtration rate at both sizes until a maximum plateau at 10.37 L/hr*g DW tissue. For the 7 cm mussels at a volume of seawater 5 L/mussel （3.37 L/g DW tissue） the filtration rate were found to be 0.94 L/hr*g DW tissue. Based on consumption of phytoplankton, nutrient uptake by green mussels is calculated. Carbon, nitrogen and phosphorus contents of C. calcitrans were determined at 34.86, 4.35 and 1.09 pg/cell, respectively. Thus, carbon, nitrogen and phosphorous removal by green mussels were found effective at a minimum rate of 3.93, 0.49 and 0.12 mg/day*g DW tissue, respectively.

关键词： Green mussel filtration rate nutrient removal chlorophyll a

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Changes of Water Temperature and Harmful Algal Bloom in the Daya Bay in the Northern South China Sea

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Marine Science Bulletin 2007年第2期9卷 25-33页

作者：余景唐丹玲王素芬练建生王友绍中国科学院南海海洋研究所热带海洋环境动力学重点实验室遥感与海洋生态环境学科组广东广州510301 中国科学院研究生院中国水产科学研究院南海水产研究所广东广州510301 中国科学院南海海洋研究所热带海洋环境动力学重点实验室

Economic development around the Daya Bay, China has profoundly affected the marine environment in the bay area in recent years, particularly since the operation of Daya Bay Nuclear Power Station （DNPS） in 1994. This study analyzed the changes of water temperature and harmful algal blooms （HABs） for two periods： 1983-1993 and 1994-2004, using in situ and satellite data. Results showed that yearly mean surface water temperature （SWT） and Chl-a concentration （Chl-a） increased by 1.1 ℃ and 1.9 mg/m^3, respectively, after 1994. The monthly occurrence of HAB was found to have increased also. HABs appeared only in spring and autumn before 1994, but occurred all the year round after 1994. SWT, Chl-a and HABs all increased significantly in May. Those changes were associated with environmental changes in this area, such as thermal discharge from the DNPS and enhancement of eutrophication from human activities around the Daya Bay.

关键词： water temperature Harmful Algal Bloom chlorophyll a nuclear power station Daya Bay, China

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