Mesophyll resistance to photosynthetic carbon dioxide uptake in leaves: dependence upon stomatal aperture

1984 ◽  
Vol 62 (1) ◽  
pp. 163-165 ◽  
Author(s):  
David F. Parkhurst
Keyword(s):  
Differential Equation ◽  
Carbon Dioxide ◽  
Partial Differential Equation ◽  
Chemical Reaction ◽  
Stomatal Resistance ◽  
Stomatal Aperture ◽  
Plant Leaves ◽  
Carbon Dioxide Uptake ◽  
Photosynthetic Carbon ◽  
Mesophyll Resistance

A model for carbon dioxide uptake by plant leaves, based on the partial differential equation for diffusion with chemical reaction, is used to simulate photosynthesis for various stomatal openings. The results show that not only the "stomatal resistance" but also the commonly calculated "mesophyll resistance" varies when nothing but stomatal aperture is changed. Simplistic uses of the resistance concept (or related conductances) may be more misleading than useful for modelling photosynthesis, because the various resistance components are neither independent nor additive.

PHOTOSYNTHETIC CARBON DIOXIDE UPTAKE DURING IN VITRO CULTURE OF ARNICA MONTANA

2012 ◽  
pp. 291-296
Author(s):  
M. Motounu ◽  
G.C. Popescu ◽  
V. Alexiu
Keyword(s):  
Carbon Dioxide ◽  
In Vitro Culture ◽  
Arnica Montana ◽  
Carbon Dioxide Uptake ◽  
Photosynthetic Carbon

Differential Gas Exchange Responses of Two Biotypes of Redroot Pigweed to Atrazine

Weed Science ◽  
1976 ◽  
Vol 24 (1) ◽  
pp. 68-72 ◽  
Author(s):  
L. D. West ◽  
T. J. Muzik ◽  
R. E. Witters
Keyword(s):  
Carbon Dioxide ◽  
Gas Exchange ◽  
Photosynthetic Activity ◽  
Guard Cells ◽  
Stomatal Resistance ◽  
Amaranthus Retroflexus ◽  
Redroot Pigweed ◽  
Mesophyll Tissue ◽  
Diffusive Resistance ◽  
Mesophyll Resistance

Differences were shown to exist in photosynthetic rate, transpiration rate, and carbon dioxide leaf diffusive resistance between atrazine [2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine] susceptible (S) and resistant (R) plants of redroot pigweed (Amaranthus retroflexusL.). Chlorbromuron [3-(4-bromo-3-chlorophenyl)-1-methoxy-1-methylurea] and diruon [3-(3,4-dichlorophenyl)-1,1-dimethylurea] were the only herbicides tested that controlled both biotypes, but all of the herbicides except norea [3-(hexahydro-4,7-methanoindan-5-yl)-1,1-dimethylurea] controlled the S biotype. Although photosynthetic activity and transpiration were reduced in both biotypes by atrazine at 50 and 70 ppm, the decline was much greater in the S biotype than in the R biotype and persisted a longer time in the S biotype. Leaf CO2diffusive resistances of the biotypes were increased by atrazine applications. Mesophyll resistance was increased to a greater extent than stomatal resistance suggesting that reduction of photosynthesis is due to a greater effect of atrazine on the mesophyll tissue than on the guard cells.

scholarly journals Calibration of Simultaneous Measurements of Photosynthetic Carbon Dioxide Uptake and Oxygen Evolution in Leaves

2006 ◽  
Vol 48 (1) ◽  
pp. 198-203 ◽  
Author(s):  
V. Oja ◽  
H. Eichelmann ◽  
A. Laisk
Keyword(s):  
Carbon Dioxide ◽  
Oxygen Evolution ◽  
Carbon Dioxide Uptake ◽  
Simultaneous Measurements ◽  
Photosynthetic Carbon

scholarly journals Mechanism of Photosynthetic Carbon Dioxide Uptake by the Red Macroalga, Chondrus crispus

1989 ◽  
Vol 89 (1) ◽  
pp. 93-99 ◽  
Author(s):  
Ronald G. Smith ◽  
R.G.S. Bidwell
Keyword(s):  
Carbon Dioxide ◽  
Chondrus Crispus ◽  
Carbon Dioxide Uptake ◽  
Photosynthetic Carbon ◽  
Red Macroalga

Effects of temperature on the photosynthesis–irradiance response curves of newly matured leaves of alfalfa

1977 ◽  
Vol 55 (8) ◽  
pp. 872-879 ◽  
Author(s):  
S. B. Ku ◽  
L. A. Hunt
Keyword(s):  
Carbon Dioxide ◽  
Stomatal Resistance ◽  
Carbon Dioxide Exchange ◽  
Response Curves ◽  
Oxygen Inhibition ◽  
Thermal Environments ◽  
Growth Regime ◽  
Medicago Sativa L ◽  
Effects Of Temperature ◽  
Mesophyll Resistance

Various carbon dioxide exchange characteristics are described for two alfalfa (Medicago sativa L.) genotypes (AT 171 and CC 120) grown at 20:15 °C and 30:25 °C day:night temperatures and 53 nE cm−2 s−1 irradiance (400–700 nm). Growth at 30:25 °C as compared with 20:15 °C resulted in lower net carbon dioxide exchange rates (NCE) for both genotypes when analyzed at 20 °C, but did not cause any sizeable change for CC 120 at 30 °C. Oxygen inhibition of photosynthesis increased with irradiance to 48 nE cm−2 s−1 but either declined or remained constant with further increase in irradiance. Oxygen inhibition was higher at 30 °C than at 20 °C and was not consistently influenced by growth temperature. However, the ratio of oxygen inhibition to carbon dioxide exchange rate in air containing 1% oxygen and the mesophyll resistance were greater with AT 171 grown at 30:25 °C than at 20:15 °C, particularly at high irradiances. NCE measured at 20 °C instead of 30 °C for plants grown at 30:25 °C was reduced to a much more marked extent with CC 120 than with AT 171; this difference was paralleled by a more marked increase in stomatal resistance length (rSL) for CC 120.rSL decreased with an increase in irradiance, was generally higher at 20 °C than at 30 °C, and did not differ between growth temperatures when measured at an irradiance of 116 nE cm−2 s−1 and a temperature equal to the day temperature of the growth regime. The results are discussed in relation to factors responsible for adaptability to different thermal environments.

Photosynthesis and Carbon Dioxide Transfer Resistance of Lodgepole Pine Seedlings in Relation to Irradiance, Temperature, and Water Potential

1974 ◽  
Vol 4 (2) ◽  
pp. 201-206 ◽  
Author(s):  
Gary F. Dykstra
Keyword(s):  
Carbon Dioxide ◽  
Water Potential ◽  
Environmental Conditions ◽  
Net Photosynthesis ◽  
Stomatal Resistance ◽  
Transfer Resistance ◽  
Pine Seedlings ◽  
Rate Limiting ◽  
Potential Maximum ◽  
Mesophyll Resistance

Photosynthesis and stomatal and total equivalent mesophyll resistances to CO2 transfer were measured in relation to irradiance, needle temperature, and tree water potential. Maximum rates of net photosynthesis were attained at 380 W m−2 irradiance, 20 °C needle temperature, and the highest tree water potential obtained, ca. −2.5 bars. Stomatal and total mesophyll resistances have a significant rate-limiting role when environmental conditions are less than optimum. Mesophyll resistance was larger than stomatal resistance under all environmental conditions.

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