scholarly journals Rate of photosynthesis of some forest mosses as a function of temperature and light intensity and effect of water content of moss cushion on photosynthetic rate.

Silva Fennica ◽  
1976 ◽  
Vol 10 (4) ◽  
Author(s):  
Seppo Kellomäki ◽  
Pertti Hari
Keyword(s):  
Light Intensity ◽  
Water Content ◽  
Photosynthetic Rate ◽  
Effect Of Water ◽  
Rate Of Photosynthesis

Photosynthetic characteristics of a purple sulfur bacterium grown under different light intensities

1972 ◽  
Vol 18 (12) ◽  
pp. 1825-1828 ◽  
Author(s):  
M. Takahashi ◽  
K. Shiokawa ◽  
S. Ichimura
Keyword(s):  
Light Intensity ◽  
Photosynthetic Rate ◽  
Photosynthetic Characteristics ◽  
High Light ◽  
Bacteriochlorophyll A ◽  
Low Light ◽  
Purple Sulfur Bacterium ◽  
Light Intensities ◽  
Rate Of Photosynthesis ◽  
Structural Mechanisms

Photosynthetic characteristics of a purple sulfur bacterium, Chromatium, strain D, cultured under various light intensities were examined. With a decrease in the light intensity used for culture, the bacteriochlorophyll a content per unit cell nitrogen increased. Also, at low light intensities, the rate of photosynthesis (per unit bacteriochlorophyll a) was higher in samples grown under low light than in those grown under high light. These two responses to low light intensity are adaptations that ensure a high photosynthetic rate for the purple sulfur bacterium that usually occurs in a dimly lit environment. Possible chemical and structural mechanisms involved are discussed.

The effect of some environmental factors on the growth of young aspen trees (Populus tremuloides) in controlled environments

1971 ◽  
Vol 49 (8) ◽  
pp. 1443-1453 ◽  
Author(s):  
G. C. Bate ◽  
D. T. Canvin
Keyword(s):  
Light Intensity ◽  
Photosynthetic Rate ◽  
Populus Tremuloides ◽  
Dark Respiration ◽  
Continuous Light ◽  
Carbon Gain ◽  
Fluorescent Light ◽  
Controlled Environment ◽  
Rate Of Photosynthesis ◽  
Photosynthesis And Respiration

Several populations (each of 32 trees) of young aspen trees (Populus tremuloides Michx) were allowed to break from dormancy in controlled environment cabinets. The rate of photosynthesis and dark respiration and the rate of carbon gain (as difference between photosynthesis and respiration) of the population as affected by photoperiod duration, light intensity, and day/night temperatures was determined by measuring the CO2 exchange of the whole population using the controlled environment cabinet as the plant chamber.The rates of photosynthesis of the plants were similar during both 12- or 18-h photoperiods. The rates of respiration during the corresponding night periods were also similar. In continuous light the photosynthetic rate remained unchanged if growth (expansion of new leaves) was rapid. During periods of slower growth, the photosynthetic rate in continuous light was reduced. In spite of this reduction in the rate of photosynthesis, carbon gain was still greatest under continuous light.In the day/night temperature study, the largest gains in carbon per day by the aspen trees were obtained at day/night temperatures of 15/10 °C or 15/15 °C. Higher day or night temperatures resulted in decreased rates of carbon gain.Increased light intensity from fluorescent lamps resulted in increased rates of photosynthesis. Addition of incandescent light to the fluorescent light resulted, in almost all cases, in decreased rates of photosynthesis. This may, in part, be due to effects on leaf temperature.Photosynthesis of the populations was usually maximal at the beginning of the photoperiod and decreased steadily during the photoperiod. The rate of decrease was directly related to the rate of photosynthesis at the beginning of the photoperiod.Both photosynthesis and respiration were affected by temperature and light but no clear relationship existed between the rate of CO2 exchange during the photoperiod and that during the nyctoperiod following.

The Effect of Water Stress on the Physiology of Vinca major 'Variegata'

2013 ◽  
Vol 409-410 ◽  
pp. 782-787 ◽  
Author(s):  
Fei Yong Liao ◽  
Ying Xie ◽  
Hui Jiang
Keyword(s):  
Water Stress ◽  
Drought Stress ◽  
Plant Growth ◽  
Water Content ◽  
Net Photosynthetic Rate ◽  
Photosynthetic Rate ◽  
Irrigation Water ◽  
Robinia Pseudoacacia ◽  
Effect Of Water ◽  
Vinca Major

The effects of water stress on the two year old Vinca majorVariegata were tested for proving the irrigation guidance for its application in the garden. The results showed that the water flood and the drought stress suppressed the plant growth. After treated with flooding for 13days, the qP, ETR, Fv'/Fm' and net photosynthetic rate were decreased, but the qN were increased and the plants were dead. The mid drought stress (the water content of soil were between 20 percent and 30 percent) slightly affected the growth of plant, which embodies in the slight decline of chlorophyll, qP, ETR, Fv'/Fm', Fv/Fm and qP, the ascend of net photosynthetic rate. Drought Stress badly affected the growth of plant, which embodies in the decline of chlorophyll, qP, ETR, Fv'/Fm', Fv/Fm, qP and net photosynthetic rate. The best irrigation for plant was the water content of soil between 20 percent and 30 percent, which does not affect the ornamental value of Robinia pseudoacacia and save the irrigation water. So the application of V. majorVariegata should avoid in the place for over 13 days water flood.

EFFECT OF WATER CONTENT ON PROPERTIES OF Na2O, 3SiO2 GLASSES

1982 ◽  
Vol 43 (C9) ◽  
pp. C9-455-C9-458 ◽  
Author(s):  
M. Takata ◽  
M. Tomozawa ◽  
J. Acocella ◽  
J. Molinelli ◽  
C. Y. Erwin ◽  
...  
Keyword(s):  
Water Content ◽  
Effect Of Water

Effect of water content on microwave dielectric properties of building materials

2020 ◽  
Vol 263 ◽  
pp. 120107
Author(s):  
Romain Damez ◽  
Philippe Artillan ◽  
Arthur Hellouin de Menibus ◽  
Cédric Bermond ◽  
Pascal Xavier
Keyword(s):  
Dielectric Properties ◽  
Water Content ◽  
Building Materials ◽  
Microwave Dielectric Properties ◽  
Effect Of Water ◽  
Microwave Dielectric

The influence of red and blue light on the rate of photosynthesis and the CO2 compensation point at various oxygen concentrations

1970 ◽  
Vol 48 (6) ◽  
pp. 1251-1257 ◽  
Author(s):  
N. P. Voskresenskaya ◽  
G. S. Grishina ◽  
S. N. Chmora ◽  
N. M. Poyarkova
Keyword(s):  
Nicotiana Tabacum ◽  
Blue Light ◽  
Photosynthetic Rate ◽  
Prolonged Exposure ◽  
Red Light ◽  
Compensation Point ◽  
Gas Analyzer ◽  
Co2 Compensation Point ◽  
Rate Of Photosynthesis ◽  
Light Inhibition

Apparent photosynthesis of attached leaves of Phaseolus vulgaris, Vicia faba, Pisum sativum, and Nicotiana tabacum at various intensities of blue and red light was measured by infrared CO2 gas analyzer in a closed system. Simultaneously the CO2 compensation point was measured.It was found that light-limited photosynthetic rate in blue light was equal to or more than that in red light. Inhibition of photosynthesis, which sometimes occurred at light-saturated intensities of blue light, could be avoided by addition of red light, prolonged exposure of the plants to blue light, or by lowering the O2 concentration. Accordingly, the increase of photosynthetic rate due to change of O2 concentration from 21 to 3% O2 is higher in blue light only when photosynthesis is inhibited by blue light at 21% O2. The data on the action of blue and red light on the CO2 compensation point seems to exclude the activation of photorespiration by blue light.The possible effects of blue light on apparent photosynthesis are discussed on the basis of the results presented.

Effect of water content on solute transport in a porous medium containing reactive micro-aggregates

1998 ◽  
Vol 33 (1-2) ◽  
pp. 211-230 ◽  
Author(s):  
Claudia Fesch ◽  
Peter Lehmann ◽  
Stefan B. Haderlein ◽  
Christoph Hinz ◽  
René P. Schwarzenbach ◽  
...  
Keyword(s):  
Porous Medium ◽  
Solute Transport ◽  
Water Content ◽  
Effect Of Water
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