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53 results for “chlorophyll fluorescence”
Fig. 6 in Rosmarinic acid and hesperidin regulate gas exchange, chlorophyll fluorescence, antioxidant system and the fatty acid biosynthesis-related gene expression in Arabidopsis thaliana under heat stress
Fig. 6. The changes of the relative band intensity of different types of ascorbate glutathione isoenzymes (APX, A) and APX activity (B), and glutathione reductase activity (GR, C) after rosmarinic acid (RA, 100 μM) and/or hesperidin (HP, 100 μM) with/without heat stress (38 ◦C) in A. thaliana leaves.
Data from: Comparison of solar-induced chlorophyll fluorescence, light-use efficiency, and process-based GPP models in maize
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Data for: The photosynthetic response of spectral chlorophyll fluorescence differs across species and light environments in a boreal forest ecosystem
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Cell size, chlorophyll fluorescence and cadmium bioaccumulation between wild-type and mutant strains of Chlamydomonas reinhardtii upon exposure to cadmium
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Genetic Diversity, Ecological Niches, and Climate Change Vulnerability of Aspens in the Upper Midwest:chlorophyll fluorescence
Quaking aspen (Populus tremuloides) is the most cosmopolitan tree species in North America and an important native at Cedar Creek and across the Midwest. Aspen stands are quite common through eastern, central, and northern Minnesota, and occur sporadically in cool, wet microclimates across the Great Plains. Currently, these stands are in decline, are poorly reproducing in the wild, and are suffering from a range of stresses. Climate change associated phenomena, drought and altered freeze-thaw cycles, have contributed to massive aspen dieback, especially in the American West. We have received funding from the National Park Service to assess the genetic diversity and hybrid status, age structure and health, ecological niche and historical rate of range contraction, and drought and freezing tolerance physiology of an aspen stand of interest at the Niobrara National Scenic River (NNSR) in northern Nebraska. As part of this project, we are also studying genetic diversity and physiological vulnerability to climate change in quaking and bigtooth (P. grandidentata) aspen populations in Minnesota, Wisconsin, Iowa, South Dakota, and Nebraska. We will use genetic markers to identify genetically unique stands and compare growth and survival of these to populations of the parent species under different drought and freeze-thaw conditions. This study will allow us to better pinpoint the causes of decline in the NNSR aspen stands and aspen stands across the upper Midwest, and potentially provide guidance to managers on the prioritization of particular stands for conservation or in identifying genetic sources for any ex situ conservation or assisted migration.
Chlorophyll fluorescence:FAB 1 : Forests and Biodiversity Experiment - High density diversity
A forest biodiversity experiment (FAB) focused on trees of our region investigates the consequences of multiple dimensions of tree diversity for soil, food webs, plant communities and ecosystems. FAB is designed to unravel effects of three forms of biological diversity: species richness (SR), functional diversity (FD), and phylogenetic diversity (PD). We define FD as the representation of multiple traits of leaves, roots, seeds, and the whole organism that are correlated with species positions along gradients of resource supply, growth, and decomposition. PD is the representation of evolutionary lineages measured as the genetic distances between species. While PD and FD are often correlated, convergent evolution and adaptive differentiation can decouple them. When functional traits that drive specific ecosystem functions are not phylogenetically conserved, PD and FD may give contrasting predictions. SR, PD, and FD are not independent, and we posit that PD may help explain SR effects, and FD may help explain both PD and SR effects. Thus FAB is designed to examine the separate and combined effects of all three components of diversity for multiple ecosystem functions and to distinguish between ???sampling??? and ???complementarity??? effects of biodiversity. Due to the long lag between planting tree seedlings and determining effects of tree composition and diversity on ecosystem functioning, fewer experiments have been established to elucidate the role of biodiversity in the functioning of forest ecosystems than grassland experiments. FAB will contribute to this gap and is a member of the IDENT and TreeDiv network of forest biodiversity experiments (www.treedivnet.ugent.be). Hypotheses: 1. PD, FD, and SR will all contribute to increased productivity, stability, and diversity of other trophic levels (herbivores, predators, parasitoids, soil microbes, soil flora and fauna) as well as to greater soil C sequestration. 2. Because PD incorporates both the number of species a
Chlorophyll fluorescence, moisture and chloride content for Morella cerifera on Hog Island, VA, 2007
Water content and fluorescence were measured for Morella cerifera shrubs on Hog Island, VA in 2007.
Data from 'Tracking canopy chlorophyll fluorescence with a low-cost LED platform', Brissette et al., AoBP Plants
<p>This is data to accompany the following publication:</p><p>Logan E G Brissette, Christopher Y S Wong, Devin P McHugh, Jessie Au, Erica L Orcutt, Marie C Klein, Troy S Magney, Tracking canopy chlorophyll fluorescence with a low-cost LED platform, <i>AoB PLANTS</i>, 2023;, plad069, <a href="https://doi.org/10.1093/aobpla/plad069">https://doi.org/10.1093/aobpla/plad069</a></p><p>Abstract:</p><p>Chlorophyll fluorescence measured at the leaf scale through pulse amplitude modulation has provided valuable insight into photosynthesis. At the canopy- and satellite-scale, solar-induced fluorescence (SIF) provides a method to estimate the photosynthetic activity of plants across spatiotemporal scales. However, retrieving SIF signal remotely requires instruments with high spectral resolution, making it difficult and often expensive to measure canopy-level steady-state chlorophyll fluorescence under natural sunlight. Considering this, we built a novel low-cost photodiode system that retrieves far-red chlorophyll fluorescence emission from a far-red photodiode induced by a blue light emitting diode (LED) light-source, for two hours at night, above the canopy. Our objective was to determine if an active remote sensing based nighttime photodiode method could track changes in canopy-scale LED-induced chlorophyll fluorescence (LEDIF) during an imposed drought on a broadleaf evergreen shrub, <i>Polygala myrtifolia</i>. Far-red LEDIF (720 - 740 nm) was retrieved using low-cost photodiodes (LEDIFphotodiode) and validated against measurements from aa hyperspectral spectroinstrument radiometer (LEDIFhyperspectral). To link the LEDIF signal with physiological drought response, we tracked stomatal conductance (gsw) using a porometer, as an indicator of plant water status, two leaf-level vegetation indices — photochemical reflectance index, PRI; normalized difference vegetation index, NDVI— to represent xanthophyll and chlorophyll pigment dynamics, respectively, and a pulse-amplitude modulation (PAM) device to measure photochemical and non-photochemical dynamics of photochemistry. Our results demonstrate a similar performance between the photodiode and hyperspectral retrievals of LEDIF (<i>R2=0.77</i>). Furthermore, LEDIFphotodiode closely tracked drought responses with photochemical quenching (<i>R2=0.69</i>), Fv/Fm (<i>R2=0.59</i>), and leaf-level PRI (<i>R2= 0.59</i>). Therefore, the low-cost LEDIFphotodiode approachappraoch has the potential to be a meaningful indicator of photosynthetic activity at spatial scales greater than an individual leaf and over time. </p>
Advanced Laser Fluorescence (ALF) measurements of chlorophyll-a (Chl), phycoerythrin (PE), chromophoric dissolved organic matter (CDOM), and variable fluorescence (Fv/Fm) from CCE process cruises in the California Current System, 2006 - 2012.
The Advanced Laser Fluorometry (ALF) provides spectral deconvolution (SDC) analysis of the laser-stimulated emission (LSE) excited at 405 or 532/510 nm for assessment of chlorophyll a, phycoerythrin, and chromophoric dissolved organic matter. Three spectral types of phycoerythrin are discriminated for characterization of cyanobacteria and cryptophytes in mixed phototrophic populations. The SDC analysis is integrated with measurements of variable fluorescence, Fv/Fm, corrected for the SDC-retrieved background fluorescence, BNC, for improved photophysiological assessments of phytoplankton photochemical efficiency. Fluorescence measurements are normalized to the water Raman scattering to improve the accuracy of measurements. The ALF measurements of discrete water samples from various depths were made using several ALF instrument modifications (ALF-1, ALF-T, Aquatic Laser Fluorescence Analyzer (ALFA) , or Custom Laser Analytical Spectroscopic System (CLASS)) during CCE process cruises.
ABoVE: Needle-Level Chlorophyll Fluorescence, Alaska and Idaho, USA, 2017 and 2019
This dataset provides the results of in situ measurements of needle-level chlorophyll fluorescence (ChlF) obtained from a pulse amplitude modulated (PAM) fluorometer from evergreen needleleaf forested sites one in Alaska and one in Idaho. Measured light-adapted minimal fluorescence (Ft) is reported as the quantum yield of fluorescence and light-adapted variable fluorescence over maximal fluorescence (Fv/Fm) and is reported as the quantum yield of photosystem II. Also reported for both sites are two modeled irradiance products: (1) the top-of-canopy instantaneous irradiance (W/m2) and (2) needle-level irradiance (W/m2) that was modeled to account for shadow casting and canopy orientation in modulating direct radiation. Both products were modeled to be contemporaneous with ChlF observations. At the Idaho site only, needle-level irradiance (W/m2) was measured in situ with a handheld pyranometer. The Alaska field site is located in the northern latitudinal forest-tundra ecotone (FTE) near the Dalton Highway in Northern Alaska. Thirty-six Picea glauca (white spruce) trees were sampled on 2017-07-07 to 2017-07-08. The Idaho field site is located in a montane forest near McCall, Idaho. Ten selected Abies grandis (grand fir) trees were sampled on 2019-07-05 to 2019-07-06. Measurement of needle-level ChlF occurred during clear-sky conditions such that the canopies experienced a broad range of variability in sunlit-shading patterns across the day during these near-solstice periods.
Conifer Needle Chlorophyll Fluorescence, Niwot Ridge, Colorado, USA, 2017-2018
This dataset provides chlorophyll fluorescence measurements made on pine and spruce needle tissues at the Niwot Ridge AmeriFlux Core site (US-NR1) near Nederland, Colorado, USA, during the summers of 2017 and 2018. Two types of measurements were made using pulse-amplitude-modulation (PAM) fluorometry: the photosystem II (PSII) operating efficiency in the light (Fq'/Fm' at variable light levels), and the maximum quantum efficiency of PSII photochemistry (Fv/Fm) on dark-acclimated tissues. Chlorophyll fluorescence measurements were made to determine seasonality of photosynthetic performance at the needle level.
Tundra Plant Leaf-level Spectral Reflectance and Chlorophyll Fluorescence, 2019-2021
This dataset provides leaf-level visible-near infrared spectral reflectance, chlorophyll fluorescence spectra, species, plant functional type (PFT), and chlorophyll content of common high latitude plant samples collected near Fairbanks, Utqiagvik, and Toolik, Alaska, U.S., during the summers of 2019, 2020, and 2021. A FluoWat leaf clip was used to measure leaf-level visible-near infrared spectral reflectance and chlorophyll fluorescence spectra. Fluorescence yield (Fyield) was calculated as the ratio of the emitted fluorescence divided by the absorbed radiation for the wavelengths from 400 nm up to the wavelength of the cut off for the FluoWat low pass filter (either 650 or 700 nm). Chlorophyll content of samples was measured using a CCM-300 Chlorophyll Content. The data are provided in comma-separated values (.csv) format.
Seasonal biases in fluorescence estimated chlorophyll-a derived from biogeochemical profiling floats
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Allen Brain Atlas
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