Search Results - "photon"

Ljusets betydelse för rotknoppars groningsvillighet i åkermolke (Sonchus arvensis L.) by Åhman, Magnus

“…In the experimental part perennial sow thistle was exposed to three treatments: (i) long-day with low intensity (18/6 light/dark, photon irradiance 324 μmol/m2s), (ii) short-day with low intensity (12/12 h light/dark, photon irradiance 324 μmol/m2s) and (iii) short-day with high intensity (12/12 h light/dark, photon irradiance 485 μmol/m2s). …”
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Bud activity of decapitated, nurserygrown plants of triplochiton scleroxylon in Nigeria: effect of light, temperature and humidity by Ladipo, D.O., Leakey, R.R.B., Grace, J.

“…Bud activity, shoot length and numbers of leaves produced following decapitation were all increased by high photon flux density and high humidity. In contrast to similar studies under glasshouse conditions in Britain, dominance was not re-established following the initial period of sprouting. …”
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Digital imaging as scoring method for spittlebug tolerance in Urochloa humidicola hybrids by CGIAR Research Program on Livestock

“…Comparison of single-photon avalanche diode (SPAD) measurements and digital images, visual scoring by an inexpert evaluator, and expert visual scoring, indicates that the digital imaging method for phenotyping developed by CIAT and available for uptake might improve the efficiency of breeding for increased tolerance to spittlebugs in U. humidicola.…”
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Photosynthesis and successional status of seedlings in a tropical semideciduous rain forest in Nigeria by Riddoch, I., Grace, J., Fasehun, F.E., Riddoch, B., Ladipo, D.O.

“…According to this hypothesis, pioneers display an enhanced capacity to utilize the high photon flux density associated with a gap. (2) Data were collected from nine species representing three ecological groupings: weeds of gaps, pioneer trees and climax trees. …”
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Multi-sensor approach to improve optical monitoring of papaya shrinkage during drying by Udomkun, Patchimaporn, Nagle, Marcus, Argyropoulos, D., Mahayothee, B., Müller, Joachim

“…The top-side area and total surface area derived from computer vision were analyzed, while the illuminated area and light intensity from optical scattering images were used to interpret photon migration in the fruit tissue. The relationship between moisture content and shrinkage in terms of volume and area reduction during drying was satisfactorily explained by a linear model. …”
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Morphogenesis and Tissue-Culture of Sweet Orange (Citrus-Sinensis (L) Osb) - Effect of Temperature and Photosynthetic Radiation by Durán-Vila, Núria, Gogorcena, Y., Ortega, Violeta, Ortiz Marcide, Jesús M., Navarro, Luis

“…Incubation in the dark or under low photosynthetic photon flux density (PPFD) was beneficial for callus induction and growth and also favored the production of rooted plantlets from bud cultures. …”
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Response of spinach leaves (Spinacia oleracea L.) to ozone measured by gas exchange, chlorophyll a fluorescence, antioxidant systems, and lipid peroxidation by Calatayud, Ángeles, Iglesias, Domingo J., Talón, Manuel, Barreno, Eva

“…The development of non-photochemical quenching was not high enough to decrease the photon excess in the PS2. The limitation of photosynthetic activity was probably correlated with stomata closure and with an increase in intercellular CO2 concentration. …”
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Linking photosynthesis and yield reveals a strategy to improve light use efficiency in a climbing bean breeding population by Keller, Beat, Soto, Jonatan, Steier, Angelina, Portilla-Benavides, Ana Elisabeth, Raatz, Bodo, Studer, Bruno, Walter, Achim, Muller, Onno, Urban, Milan Oldřich

“…Photosynthetic efficiency, specifically the operating efficiency of photosystem II (Fq'/Fm'), is highly responsive to actual growth conditions, especially to fluctuating photosynthetic photon fluence rate (PPFR). Under field conditions, plants constantly balance energy uptake to optimize growth. …”
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Kiselalgers anpassning till ljus : en jämförelse mellan Brachysira neoexilis och Eunotia incisa by Friheden, Ylva

Uptake of 137Cs by fungi and plants due to potassium fertilization in Heby municipality in response to the Chernobyl nuclear accident by Nilsson, Therèse

“…These samples were then placed in a High-Purity Germanium Coaxial Photon Detector to accurately determine the 137Cs activity concentration levels. …”

An architectural analysis of the elongation of field-grown sunflower root systems. Elements for modelling the effects of temperature and intercepted radiation by Aguirrezabal, Luis, Tardieu, F.

“…The effects of photosynthetic photon flux density (PPFD) and soil temperature on root system elongation rate have been analysed by using an architectural framework. …”
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Modeling leaf maximum net photosynthetic rate of Festuca pallescens, the dominant perennial grass of Patagonian pine-based silvopastoral systems by Caballe, Gonzalo, Fernandez, Marí­a Elena, Gyenge, Javier, Aparicio, Alejandro Gabriel, Schlichter, Tomas Miguel

“…We measured pre-dawn water potential (ψpd), leaf temperature and net photosynthetic rate (Pn), stomatal conductance (gs) and intercellular CO2 concentration (Ci) as a function of photosynthetic photon flux density (PPFD). The highest Pmax under non-limiting conditions was 20.4 μmol CO2 m−2 s−1 and was defined as standardized dimensionless Pmaxs = 1 for comparison of environmental factors. …”
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Dry matter production, morphology and nutritive value of Dactylis glomerata growing under different light regimes by Peri, Pablo Luis, Lucas, R.J., Moot, Derrick

“…Four levels of light intensity were compared: full sunlight (100% photosynthetic photon flux density-PPFD), open + wooden slats (∼43% PPFD), trees (∼58% PPFD) and tree + slats (∼24% PPFD). …”
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Photosynthetic response to different light intensities and water status of two main Nothofagus species of southern Patagonian forest, Argentina by Peri, Pablo Luis, Martínez Pastur, Guillermo José, Lencinas, María Vanessa

“…Net photosynthetic rate (A) and stomatal conductance (gs) of leaves of Nothofagus pumilio and N. antarctica seedlings were measured at different photosynthetic photon flux densities (PPFDs, 20, 150, 250, 500, 750, 1,000, 1,500 and 2,200 µmol/m2/s) and after 60 minutes of shade to determine the rate of photosynthetic induction after seedling transition from low to high PPFD. …”
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Morphological, anatomical, and physiological changes of orchardgrass leaves grown under fluctuating light regimes by Peri, Pablo Luis, Moot, Derrick, Jarvis, Peter, McNeil, David L., Lucas, R.J.

“…Physiologically, leaf adaptation to different light regimes was characterized by: (i) the light-saturated rate of net photosynthesis (Pmax) and to less extent the photosynthetic efficiency (a) in sun conditions was double; (ii) in sunny conditions plants grown under shade were photosynthetically less efficient than plants grown in full sunlight with lower Pmax and a values; (iii) when plants were exposed to severe shade, leaves adapted to severe shade condition had the highest Pmax, a, and u, and saturated at the minimum photosynthetic photon flux density (PPFD) value. These changes in leaf photosynthesis characteristics under different light regimes were attributed to anatomical changes that caused reductions in stomatal conductance (gs), the mesophyll surface area/leaf surface area ratio (Ames/A) and maintenance respiration for shade adapted plants. …”
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Validation of a canopy photosynthesis model for cocksfoot pastures grown under different light regimes by Peri, Pablo Luis, Moot, Derrick, McNeil, David L.

“…When shade was the only limiting factor, the maximum Pn (Pnmax) was predicted to decrease approximately linearly from 33.4 g CO2 mÿ2 dÿ1 to zero as photosynthetic photon flux density (PPFD) fell from full sunlight (1800 lmol mÿ2 sÿ1 PPFD) to 10% of this in a fluctuating light regime. …”
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Morpho-physiological responses of Nothofagus obliqua to light intensity and water status, with focus on primary growth dynamics by Torres, Cristian Daniel, Magnin, Amaru, Varela, Santiago Agustin, Stecconi, Marina, Grosfeld, Javier Edgardo, Puntieri, Javier Guido

“…For trunk shoots, we analysed the net photosynthetic rate at saturating photosynthetic photon flux density (Psat) of proximal and distal leaves. …”
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Dataset on Response of Megathyrsus maximus genotypes to shade conditions by Mayorga Cobos, Mildred Julieth, Cardoso Arango, Juan Andres

“…Red and far-red radiation were measured using a LightScout Red/Far Red Meter (Spectrum Technologies, USA), while photosynthetically active radiation (PAR) was measured using a SpectraPen Mini (Photon Systems Instruments, Czech Republic). Gas exchange and chlorophyll fluorescence: Stomatal conductance, transpiration rate, and the effective quantum yield of photosystem II were measured using a LI-600 porometer/fluorometer (LI-COR, Lincoln, NE, USA). …”
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Asociación simbiótica de dos cepas de Azospirillum con cultivares de Digitaria eriantha: respuestas al estrés abiótico by Osses, Romina Gisel, Masciarelli, Oscar, Quiroga, Andrea Mariela, Terenti, Oscar Antonio, Pedranzani, Hilda Elizabeth

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Light for dairy cows by Lindkvist, Sofia

“…The results in this study showed that a lux meter is not optimal when measuring light for a dairy cow, since a lux meter does not show color occurrence nor the variation of photon flux over the wavelength spectrum. A spectrophotometer or the ELF-method would be recommended, due to the results that shows light intensities and the distribution of colors within a specific wavelength spectrum. …”
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