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The chlorophyll meter (SPAD-502) is a simple, portable diagnostic tool that measures the greenness or relative content of leaves. Compared to the traditional destructive methods, the use of this equipment saves time, space and resources.... more
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      FluorescenceNitrogenPhotosynthetic PigmentChlorophyll a Fluorescence
The main objective of this study was to evaluate the effects of drought and re-watering on 10 varieties of barley (Hordeum vulgare L.) originating from Morocco. Five varieties obtained from the National Institute of Agricultural Research... more
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      Drought StressBiological SciencesEnvironmental SciencesStress tolerance
In order to study the effects of high salt stress on PS II in detached wheat (Triticum aestivum) leaves, the seedlings were grown in Knop solution and temperature was 20 AE 2 C. Detached leaves were exposed to high salt stress (0.1e0.5 M... more
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    •   21  
      KineticsPlant BiologyFluorescenceStress
Four methods commonly used to count phytoplankton were evaluated based upon the precision of concentration estimates: Sedgewick Rafter and membrane filter direct counts, flow cytometry, and flow-based imaging cytometry (FlowCAM). Counting... more
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      Plant BiologyFlow CytometryEnvironmental BiotechnologyApplied
Four clones of robusta coffee representing drought-tolerant (14 and 120) and drought-sensitive (46 and 109A) genotypes were submitted to a slowly imposed water deficit. Sampling and measurements were performed when predawn leaf water... more
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    •   13  
      Biological SciencesEnvironmental SciencesChlorophyll FluorescenceExperimental Botany
The photosynthetic activity of two Syrian barley landraces, Arabi (A.) Aswad and A. Abiad, grown under 120 mM NaCl, was studied, using gas exchange and chlorophyll (Chl) a fluorescence transient (OJIP) measurements. Salt treatment of... more
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    •   17  
      PhotosynthesisSalt StressBiological SciencesEnvironmental Sciences
Esca disease, as well as other trunk diseases of grapevine, is an important wood disease that impedes the water transport in plants by clogging the xylem vessels. This type of effect is not detectable for years, due to the long latency... more
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    •   16  
      Drought StressBiological SciencesEnvironmental SciencesElectron Transfer
An aggregate flux event was observed by ship and by four underwater gliders during the 2008 subpolar North Atlantic spring bloom experiment (NAB08). At the height of the diatom bloom, aggregates were observed as spikes in measurements of... more
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      GeochemistryOceanographyTemporal ResolutionOptical Sensor
The physiological response of four commercial sugarcane genotypes to water stress was evaluated by measuring the photochemical efficiency of the photosystem II (chlorophyll a fluorescence ratio, F v /F m ), estimated chlorophyll content... more
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      Factorial DesignWater StressPhysiological ResponseDrought tolerance
Survival and recovery of the seagrass Halophila ovalis (R.Br.) Hook during and after light deprivation was investigated to assist in the interpretation of recent losses of Halophila spp. in Queensland, Australia. Light deprivation... more
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      PhotosynthesisBiomassBiological SciencesGrowth
This study uses chlorophyll a fluorescence to examine the effect of environmentally relevant (1-4 h) exposures of thermal stress (35-45 8C) on seagrass photosynthetic yield in seven tropical species of seagrasses. Acute response of each... more
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      Global WarmingBiological SciencesEnvironmental SciencesThermal Stress
Effects of NaCl and KCl alone or in combination with CaCl 2 , Na 2 SO 4 or K 2 SO 4 on fast chlorophyll a (Chl a) fluorescence kinetics of mung bean (Vigna radiata L.) and Brassica (Brassica juncea Coss.) were studied. The concentrations... more
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    •   12  
      KineticsPhotosynthesisPlant BiologyFluorescence
The possible effects of selenium (Se) foliar spraying and drought were studied for 3 months in potato (Solanum tuberosum L.) cultivar Desiree in Ljubljana, Slovenia. Four combinations of treatments were conducted: well-watered plants with... more
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    •   25  
      WaterPhotosynthesisPlant BiologyMitochondria
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      Plant BiologyPlant ScienceElectron TransportAntioxidant enzyme
Water status parameters, flag leaf photosynthetic activity, abscisic acid (ABA) levels, grain yield, and storage protein contents were investigated in two droughttolerant (Triticum aestivum L. cv. MV Emese and cv. Plainsman V) and two... more
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      Plant BiologyDrought StressPlant growthPlant Growth Regulation
Young plants of two Brazilian Green Dwarf coconut ecotypes from contrasting regions in relation to climate (UGD, from a hot and humid climate and JGD, from a hot and dry climate) were submitted to three consecutive drying/recovery cycles,... more
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      PhotosynthesisStressDrought StressBiological Sciences
Anatomical, histochemical and biochemical approaches were used to study mercury uptake and phytotoxicity as well as anti-oxidative responses in two species of ferns [Chinese brake fern (Pteris vittata) and Boston fern (Nephrolepis... more
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    •   44  
      Free RadicalsEcotoxicologyPhotosynthesisBiomass
Plants of cassava (Manihot esculenta Crantz cv. Cigana Preta) grown in a sand root medium were watered with nutrient solutions containing either 3 mM nitrate (low N) or 12 mM nitrate (high N). Chlorophyll concentration, chlorophyll a/b... more
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      Biological SciencesEnvironmental SciencesChlorophyll FluorescenceNitrogen
The quality of leafy vegetables has to be guaranteed for consumers for the whole postharvest period, usually limited to 5-7 days. The quality of vegetables during storage is difficult to determine. The aim of this work was to evaluate the... more
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      Postharvest Biology and TechnologyChlorophyll a FluorescenceTotal Phenolics
The influence of ambient and filtered solar ultraviolet-B (UV)-B radiation and of selenium treatment was determined on photochemical efficiency, respiratory potential measured by electron transport system (ETS) activity, and yield in... more
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    •   17  
      PhotosynthesisPlant BiologyIntelligent Transport SystemInt
This research focuses on the effect of trampling on vegetation in high-mountain ecosystems through the electromagnetic spectrum's interaction with plant pigments, cell structure, water content and other substances that have a direct... more
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      Remote SensingFluorescence SpectroscopyFluorescenceVegetation Ecology
We review here the background and the experiments that led to the concept of excitation energy transfer among photosystem (PS) II units. On the basis of a kinetic analysis of oxygen evolution and chlorophyll a fluorescence yield, the... more
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      PhotosynthesisPlant BiologyChlorophyll a FluorescenceExcitation Energy Transfer
The sensitivity of three foliose lichen species to urban environments with different air pollution loads and climatic conditions was tested using chlorophyll a fluorescence (Chl a F) PAM measurements. Transplants of Xanthoria parietina... more
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      Air pollutionBiological SciencesEnvironmental SciencesNegative Affect
This chapter investigates the use of chlorophyll a fluorescence to better understand changes in the regulation of photosynthetic electron transport. It describes the different electron pathways utilised by photosynthetic organisms,... more
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      Chlorophyll FluorescenceElectron TransportChlorophyll a FluorescenceNon-photochemical quenching
The in-vitro acclimatization of Phalaenopsis plantlets under photoautotrophic conditions, with 0 (control), 3.43, 6.86 and 13.72 mM uniconazole (UCZ) treatments for 30 days was investigated before the plantlets were transferred to... more
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      Photosynthetic PigmentChlorophyll a FluorescenceQuantum YieldChlorophyll a
The experiment was conducted to assess the differential morpho-physiological response to stimulated water deficit and to determine the relationship between some of these morphological and physiological traits and yield components of... more
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    •   29  
      Environmental ScienceEnvironmental EducationResearch MethodologyOpen Access
Chlorophyll a fluorescence has been extensively studied over the last few years. As demonstrated, this phenomenon is closely related to the state of photosystem II, which plays a leading role in the photosynthetic process, and therefore... more
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      EngineeringFluorescenceEnvironmental MonitoringBiological Sciences
Ammonia from livestock farming affects lichen photosynthesis.
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      PhotosynthesisEnvironmental MonitoringAir pollutionEnvironmental Pollution
The success of initial tree seedling establishment is related to the capture and use of primary resources such as light and nutrients. The selection of tree species with a greater potential to assimilate carbon and capacity to efficiently... more
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    •   30  
      PhotosynthesisForest Ecology And ManagementForest EcologyBiological Sciences
Olive mill wastewater (OMW) management is a serious environmental issue for the Mediterranean area where there is the most production of olive oil. OMW contains a high organic load, substantial amounts of plant nutrients but also several... more
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      Olive OilBiological SciencesEnvironmental SciencesEnvironmental Issues
This paper deals first with the early, although incomplete, history of photoinhibition, of 'non-Q A -related chlorophyll (Chl) a fluorescence changes', and the xanthophyll cycle that preceded the discovery of the correlation between... more
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    •   49  
      BiochemistryGeneticsPhysiologyBiophysics
Esca disease, as well as other trunk diseases of grapevine, is an important wood disease that impedes the water transport in plants by clogging the xylem vessels. This type of effect is not detectable for years, due to the long latency... more
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    •   17  
      StressDrought StressBiological SciencesEnvironmental Sciences
All photosynthetic organisms endeavor to balance energy supply with demand. For sea-ice diatoms, as with all marine photoautotrophs, light is the most important factor for determining growth and carbon-fixation rates. Light varies from... more
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      Antarctic EcologyAntarcticaChlorophyllPulse Amplitude Modulation (PAM)
Increased temperature, atmospheric CO 2 and change in precipitation patterns affect plant physiological and ecosystem processes. In combination, the interactions between these effects result in complex responses that challenge our current... more
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      Climate ChangeWaterCarbon DioxidePhotosynthesis
Temperature response curves of chlorophyll a Xuorescence parameters were used to assess minimum subzero temperature assuring functioning of photosynthetic photochemical processes in photosystem II (PS II) of Antarctic lichens. Umbilicaria... more
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      Image AnalysisBiological SciencesChlorophyll a FluorescencePolar Biology
Recently a new Maxi-Imaging-PAM (Max-I-PAM) instrument for phytotoxicity assessment via chlorophyll fluorescence imaging was introduced. This new instrument allows rapid detection of the effects of PS II inhibiting herbicides which are... more
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    •   28  
      Water qualityAustraliaFluorescence MicroscopyRisk assessment
Anatomical, histochemical and biochemical approaches were used to study mercury uptake and phytotoxicity as well as anti-oxidative responses in two species of ferns [Chinese brake fern (Pteris vittata) and Boston fern (Nephrolepis... more
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    •   44  
      Free RadicalsEcotoxicologyPhotosynthesisBiomass
After briefly describing my early collaborative work at the University of Allahabad, that had laid the foundation of my research life, I present here some of our research on photosynthesis at the University of Illinois at... more
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      History of SciencePhotosynthesisArtificial PhotosynthesisChlorophyll a Fluorescence
Iron (Fe) is an essential nutrient for plant growth and development. In plant tissues, approximately 80% of Fe is found in photosynthetic cells. This study was carried out to determine the effect of different iron concentrations on the... more
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      KineticsPhotosynthesisPlant BiologyHydroponics
Mediterranean maquis coastal ecosystems are subject to multiple oxidative stresses of both natural and anthropic origin, as sea spray, drought, high irradiance and ozone. In this article it is hypothesized that the interaction of ozone... more
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      Biological SciencesEnvironmental SciencesNegative AffectStress response
The effects of DCMU (3-(3V,4V-dichlorophenyl)-1,1-dimethylurea) on the fluorescence induction transient (OJIP) in higher plants were reinvestigated. We found that the initial ( F 0 ) and maximum ( F M ) fluorescence levels of DCMU-treated... more
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      FluorescenceBiological SciencesPhysical sciencesphotosystem I
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      PhysiologyPhotosynthesisFluorescenceMultidisciplinary
In order to study the effects of high salt stress on PS II in detached wheat (Triticum aestivum) leaves, the seedlings were grown in Knop solution and temperature was 20 AE 2 C. Detached leaves were exposed to high salt stress (0.1e0.5 M... more
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    •   21  
      KineticsPlant BiologyFluorescenceStress
Assessments of photosynthetic activity in marine plants can now be made in situ using a newly developed, submersible, pulse-amplitude modulated (PAM) fluorometer: Diving-PAM. PAM fluorometry provides a measure of chlorophyll a... more
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      Marine BiologyBiological SciencesEnvironmental SciencesWestern Australia
In order to detect early effects of plant contamination by fluoride emission on two tropical grasses, Chloris gayana and Panicum maximum, previously cultivated under greenhouse conditions, were exposed to a single source of fluoride... more
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      EcotoxicologyPhotosynthesisFluorescenceBrazil
Some ecophysiological parameters related to plant performance and fitness (carbon and nitrogen isotope composition and total C and N concentrations; in situ chlorophyll fluorescence measurements) were determined for over 30 species in... more
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      Plant BiologyRain forestWater use efficiencyAtlantic Forest
High temperatures and high atmospheric vapor pressure deficits (VPDs) are usually encountered in greenhouses in hot climates. For citrus, these environmental conditions can lead to decreases in photosynthetic activity with detrimental... more
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    •   14  
      Chlorophyll FluorescencePlant growthPolypropyleneHigh Temperature
Measurements of laser-induced chlorophyll fluorescence of living leaves were compared to ecophysiological parameters, both in near and far field conditions. Near field measurements were carried out with a two-wavelength portable... more
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      Remote SensingGeomatic EngineeringChlorophyll a FluorescenceEnvironmental Stress
High temperatures and high atmospheric vapor pressure deficits (VPDs) are usually encountered in greenhouses in hot climates. For citrus, these environmental conditions can lead to decreases in photosynthetic activity with detrimental... more
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      PhotosynthesisArboricultureChlorophyll FluorescenceNet
In this work, the effect of sucrose on photosynthetic activity during in vitro culture was studied. Experiments were carried out using uniform somatic embryo-derived germlings of Gentiana kurroo (Royle) confirmed by chromosome counting... more
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    •   7  
      Plant BiologyFlow CytometryIn vitro cultureChlorophyll a Fluorescence