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  • 1
    Electronic Resource
    Electronic Resource
    Transpiration and Leaf Temperature (1968)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Plant Physiology 19 (1968), S. 211-238 
    Details
    ISSN: 0066-4294
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.pp.19.060168.001235
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  • 2
    Electronic Resource
    Electronic Resource
    Non-stomatal limitation of CO2 assimilation in three tree species during natural drought conditions (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 66 (1986), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The effect of drought on CO2 assimilation and leaf conductance was studied in three northern hardwood species: Quercus rubra L., Acer rubrum L. and Populus grandidentata Michx. Leaf gas exchange characteristics at two CO2 levels (320 and 620 μl I−1) and temperatures from 20 to 35°C were measured at the end of a dry period and shortly after 10 cm of rainfall. The effects of drought varied with species, temperature and CO2 level. Calculated values of internal CO2 concentration showed little or no decline during drought. Differences in assimilation, before vs after the rains, were most apparent at the higher CO2 level. These latter two observations indicate nonstomatal disruption of CO2 assimilation during the dry period. In P. grandidentata there was a substantial interaction between drought and temperature, with a resultant shift in the temperature for maximum assimilation to lower temperatures during drought. During drought, internal CO2 concentrations increased sharply in all three species under the combined conditions of high temperatures and the higher CO2 level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1986.tb05961.x
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  • 3
    Electronic Resource
    Electronic Resource
    Development of a photosynthesis model with an emphasis on ecological applications (1980)
    Springer
    Oecologia 45 (1980), S. 147-155 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A physiologically based steady-state model of whole leaf photosynthesis (WHOLEPHOT) is used to describe net photosynthesis daily time courses in Prunus armeniaca. Net photosynthesis rates are calculated in response to incident light intensity, leaf temperature, air carbon dioxide concentration, and leaf diffusion resistance measured at five minute intervals. The steady-state calculations closely approximate the observed net photosynthesis rates for a broad range of weather conditions and leaf stomatal behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00346453
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  • 4
    Electronic Resource
    Electronic Resource
    The diurnal time course of net photosynthesis of soybean leaves: Analysis with a physiologically based steady-state photosynthesis model (1980)
    Springer
    Oecologia 46 (1980), S. 314-321 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A physiologically based steady-state model of whole leaf photosynthesis (WHOLEPHOT) is used to analyze observed net photosynthesis daily time courses of soybean, Glycine max (L.) Merr., leaves. Observations during two time periods of the 1978 growing season are analyzed and compared. After adjustment of the model for soybean, net photosynthesis rates are calculated with the model in response to measured incident light intensity, leaf temperature, air carbon dioxide concentration, and leaf diffusion resistance. The steady-state calculations closely approximate observed net photosynthesis. Results of the comparison reveal a decrease in photosynthetic capacity in leaves sampled during the second time period, which is associated with decreasing ability of leaves to respond to light intensity and internal air space carbon dioxide concentration, increasing mesophyll resistance, and increasing stomatal resistance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00346258
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  • 5
    Electronic Resource
    Electronic Resource
    Development of a photosynthesis model with an emphasis on ecological applications (1977)
    Springer
    Oecologia 30 (1977), S. 189-207 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A theoretical description of the simultaneous processes of photosynthesis and photorespiration in a single leaf is developed, based on the hypothesis that carbon dioxide and oxygen compete for the active site of ribulose diphosphate carboxylase. Michaelis-Menten kinetics and competitive inhibition at the end of a diffusion path provide the basic structure of the model. Data of Ludwig (1972) from sunflower are analyzed according to the formulation. This description is part of a more general physiological-ecological model of photosynthesis presented previously (Tenhunen et al., 1976a, b) and continues to elaborate sub-processes in terms of physiologically meaningful parameters. The description is considered a working hypothesis. Data on photorespiration from the literature are reviewed as they relate to this working hypothesis. Several lines of investigation are thereby suggested that will help clarify the role of photorespiration in whole leaf photosynthesis and determine the over-all utility of this modeling approach.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01833627
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  • 6
    Electronic Resource
    Electronic Resource
    Development of a photosynthesis model with an emphasis on ecological applications (1976)
    Springer
    Oecologia 26 (1976), S. 101-119 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Photosynthesis was measured in leaves ofPhaseolus vulgaris and analyzed according to the set of equations outlined previously by Tenhunen et al. (1976).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00582889
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  • 7
    Electronic Resource
    Electronic Resource
    Development of a photosynthesis model with an emphasis on ecological applications (1976)
    Springer
    Oecologia 26 (1976), S. 89-100 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary In this paper, a description of photosynthesis in a single leaf is developed that separates physiological sub-processes and that is practical to apply as an ecological tool. Temperature dependencies are emphasized with the ultimate aim of linking such a description of photosynthesis with equations describing the energy budget of particular leaves. The description of photosynthesis can be applied toC 4 plants at this time and is needed to describe photosynthesis inC 3 plants when photorespiration is included. If the model is used to analyze at various times the response of a plant adjusting its metabolism to changes in light, temperature, or other factors experienced during growth, we will obtain a dynamic picture of the acclimation process. It will also be possible to determine the phenotypic plasticity of particular plants with respect to the metabolic sub-processes outlined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00582888
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  • 8
    Electronic Resource
    Electronic Resource
    Analysis of gas exchange in seedlings of Acer saccharum: integration of field and laboratory studies (1985)
    Springer
    Oecologia 65 (1985), S. 338-347 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In the field, photosynthesis of Acer saccharum seedlings was rarely light saturated, even though light saturation occurs at about 100 μmol quanta m-2 s-1 photosynthetic photon flux density (PPFD). PPFD during more than 75% of the daylight period was 50 μmol m-2 s-1 or less. At these low PPFD's there is a marked interaction of PPFD with the initial slope (CE) of the CO2 response. At PPFD-saturation CE was 0.018 μmol m-2 s-1/(μl/l). The apparent quantum efficiency (incident PPFD) at saturating CO2 was 0.05–0.08 mol/mol. $${\text{CO}}_{2^ - }$$ and PPFD-saturated CO2 exchange was 6–8 μmol m-2 s-1. The ratio of internal CO2 concentration to external (C i /C a ) was 0.7 to 0.8 except during sunflecks when it decreased to 0.5. The decrease in C i /C a during sunflecks was the result of the slow response of stomates to increased PPFD compared to the response of net photosynthesis. An empirical model, which included the above parameters was used to simulate the measured CO2 exchange rate for portions of two days. Parameter values for the model were determined in experiments separate from the daily time courses being sumulated. Analysis of the field data, partly through the use of simulations, indicate that the elimination of sunflecks would reduce net carbon gain by 5–10%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00378907
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  • 9
    Electronic Resource
    Electronic Resource
    Interactive effects of light, leaf temperature, CO2 and O2 on photosynthesis in soybean (1985)
    Springer
    Planta 165 (1985), S. 249-263 
    Details
    ISSN: 1432-2048
    Keywords: Glycine (photosynthesis) ; Photosynthesis model ; Ribulose-1,5-bisphosphate carboxylase-oxygenase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A biochemical model of C 3photosynthesis has been developed by G.D. Farquhar et al. (1980, Planta 149, 78–90) based on Michaelis-Menten kinetics of ribulose-1,5-bisphosphate (RuBP) carboxylase-oxygenase, with a potential RuBP limitation imposed via the Calvin cycle and rates of electron transport. The model presented here is slightly modified so that parameters may be estimated from whole-leaf gas-exchange measurements. Carbon-dioxide response curves of net photosynthesis obtained using soybean plants (Glycine max (L.) Merr.) at four partial pressures of oxygen and five leaf temperatures are presented, and a method for estimating the kinetic parameters of RuBP carboxylase-oxygenase, as manifested in vivo, is discussed. The kinetic parameters so obtained compare well with kinetic parameters obtained in vitro, and the model fits to the measured data give r 2values ranging from 0.87 to 0.98. In addition, equations developed by J.D. Tenhunen et al. (1976, Oecologia 26, 89–100, 101–109) to describe the light and temperature responses of measured CO2-saturated photosynthetic rates are applied to data collected on soybean. Combining these equations with those describing the kinetics of RuBP carboxylase-oxygenase allows one to model successfully the interactive effects of incident irradiance, leaf temperature, CO2 and O2 on whole-leaf photosynthesis. This analytical model may become a useful tool for plant ecologists interested in comparing photosynthetic responses of different C3 plants or of a single species grown in contrasting environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00395048
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  • 10
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    Interactive effects of light, leaf temperature, CO2 and O2 on photosynthesis in soybean (1985)
    Springer
    Details
    Publication Date: 1985-01-01
    Print ISSN: 0032-0935
    Electronic ISSN: 1432-2048
    Topics: Biology
    Published by Springer
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