CO2 compensation concentration in bean Leaves: Effect of photon flux density and leaf age

1979 ◽  
Vol 21 (5) ◽  
pp. 361-364 ◽  
Author(s):  
J. Čatský ◽  
Ingrid Tichá
Keyword(s):  
Flux Density ◽  
Leaf Age ◽  
Photon Flux ◽  
Photon Flux Density ◽  
Co2 Compensation Concentration ◽  
Compensation Concentration ◽  
Bean Leaves

scholarly journals Isoprene Emission from Velvet Bean Leaves (Interactions among Nitrogen Availability, Growth Photon Flux Density, and Leaf Development)

1994 ◽  
Vol 105 (1) ◽  
pp. 279-285 ◽  
Author(s):  
P. C. Harley ◽  
M. E. Litvak ◽  
T. D. Sharkey ◽  
R. K. Monson
Keyword(s):  
Flux Density ◽  
Leaf Development ◽  
Nitrogen Availability ◽  
Photon Flux ◽  
Photon Flux Density ◽  
Velvet Bean ◽  
Isoprene Emission ◽  
Bean Leaves

Leaf nitrogen distribution in relation to leaf age and photon flux density in dominant and subordinate plants in dense stands of a dicotyledonous herb

Oecologia ◽  
1998 ◽  
Vol 113 (3) ◽  
pp. 314-324 ◽  
Author(s):  
N. P. R. Anten ◽  
K. Miyazawa ◽  
K. Hikosaka ◽  
H. Nagashima ◽  
T. Hirose
Keyword(s):  
Flux Density ◽  
Leaf Age ◽  
Leaf Nitrogen ◽  
Photon Flux ◽  
Photon Flux Density ◽  
Nitrogen Distribution

Transient Depression of Photosynthesis in Bean Leaves During Rapid Water Loss

1993 ◽  
Vol 20 (1) ◽  
pp. 45 ◽  
Author(s):  
H Modau ◽  
SC Wong ◽  
CB Osmond
Keyword(s):  
Partial Pressure ◽  
Flux Density ◽  
Water Loss ◽  
Loss Rate ◽  
Photon Flux ◽  
Photon Flux Density ◽  
Co2 Uptake ◽  
Co2 Partial Pressure ◽  
Water Loss Rate ◽  
Bean Leaves

The response of the photosynthetic capacity of mesophyll to a rapid loss of water from the leaf was evaluated by measuring transpiration, net CO2 uptake and temperature in dwarf bean leaves exposed to saturating CO2 partial pressures in a leaf chamber before and after cutting the petiole in air. Some plants were pre-exposed to low or high photon flux density, or to water deficit before measurements. During 3-5 min after cutting, when the turgorpassive opening of the stomata accelerated the water loss from the leaf, the rate of CO2 uptake was depressed; the depression was more pronounced in young leaves, under higher CO2 partial pressure, and in leaves pre-exposed to low photon flux density or to slight water deficit. During subsequent closure of the stomata, the CO2 uptake rate accelerated, although the leaf water content and the internal CO2 partial pressure declined. The depression in CO2 uptake was poorly correlated with the water loss rate after cutting, but it was positively correlated with the increase in water loss rate relative to the transpiration rate before the cutting. It is speculated that sharp perturbation in leaf water regime may induce a transient leakage of cellular membranes and redistribution of metabolites between cell compartments, resulting in a depression of photosynthesis. Subsequent restoration of the concentrations of metabolites in compartments tends to restore the rate of photosynthesis, which then declines due to substantial stomatal closure.

Diffusive conductances of adaxial and abaxial epidermes: Response to photon flux density during development of water stress in primary bean leaves

1979 ◽  
Vol 21 (6) ◽  
pp. 446-451 ◽  
Author(s):  
Jarmila Solárová ◽  
Jana Pospíšilová
Keyword(s):  
Water Stress ◽  
Flux Density ◽  
Photon Flux ◽  
Photon Flux Density ◽  
Bean Leaves

Effect of leaf age on photosynthesis and transpiration of cassava (Manihot esculenta)

1977 ◽  
Vol 55 (17) ◽  
pp. 2288-2295 ◽  
Author(s):  
M. Aslam ◽  
S. B. Lowe ◽  
L. A. Hunt
Keyword(s):  
Chlorophyll Content ◽  
Manihot Esculenta ◽  
Leaf Age ◽  
Gas Analysis ◽  
Photon Flux ◽  
Photon Flux Density ◽  
Genotypic Differences ◽  
Specific Leaf Weight ◽  
Manihot Esculenta Crantz ◽  
Leaf Weight

The effect of plant and leaf age on CO2-exchange rates (CER) and transpiration rates in 15 genotypes of cassava (Manihot esculenta Crantz) was measured in situ by infrared gas analysis. The plants were grown in a controlled-environment room with a 14-h photoperiod, day–night temperatures of 29–24 °C, and 60–70% relative humidity.Plant age had no effect on leaf CER, whereas transpiration rates in 14-week-old plants were significantly greater than those in 7-week-old plants. Both CER and transpiration rates decreased with leaf age. The decline was negligible when measured at low photosynthetic photon flux density. At saturating light, however, both CER and transpiration rates decreased significantly in most of the genotypes. Significant genotypic differences were observed in the pattern of decline. Both stomatal (rs) and residual (rr) resistances to the diffusion of CO2 increased with leafage in all the genotypes. The relative increase in rr was much greater than the increase in rs. In all the genotypes the ratio rr:rs was greater than unity, suggesting that rr is the major component of the total resistance to photosynthesis. Chlorophyll content and specific leaf weight also varied significantly among the genotypes. However, chlorophyll content decreased and specific leaf weight increased with leaf age.

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