Photosynthesis and Respiration in Arctic Tundra Grasses: Field Light Intensity and Temperature Responses

1973 ◽  
Vol 5 (3) ◽  
pp. 239 ◽  
Author(s):  
L. L. Tieszen
Keyword(s):  
Light Intensity ◽  
Arctic Tundra ◽  
Temperature Responses ◽  
Photosynthesis And Respiration

scholarly journals Exploring high temperature responses of photosynthesis and respiration to improve heat tolerance in wheat

2019 ◽  
Vol 70 (19) ◽  
pp. 5051-5069 ◽  
Author(s):  
Bradley C Posch ◽  
Buddhima C Kariyawasam ◽  
Helen Bramley ◽  
Onoriode Coast ◽  
Richard A Richards ◽  
...  
Keyword(s):  
High Temperature ◽  
Heat Tolerance ◽  
Yield Losses ◽  
Warming Climate ◽  
Temperature Responses ◽  
Photosynthesis And Respiration

The high temperature responses of photosynthesis and respiration in wheat are an underexamined, yet potential avenue to improving heat tolerance and avoiding yield losses in a warming climate.

scholarly journals Differences in Leaf Temperature between Lianas and Trees in the Neotropical Canopy

2018 ◽  
Author(s):  
J. Antonio Guzmán Q. ◽  
G. Arturo Sánchez-Azofeifa ◽  
Benoit Rivard
Keyword(s):  
Primary Productivity ◽  
Net Primary Productivity ◽  
Temperature Response ◽  
Life Forms ◽  
Leaf Temperature ◽  
Response Curves ◽  
Tropical Environments ◽  
Host Trees ◽  
Temperature Responses ◽  
Photosynthesis And Respiration

Leaf temperature (Tleaf) influences photosynthesis and respiration. Currently, there is a growing interest on including lianas in productivity models due to their increasing abundance, and their detrimental effects on net primary productivity in tropical environments. Therefore, understanding the differences of Tleaf between lianas and trees is important for future of forest on whole ecosystem productivity. Here we determined the displayed leaf temperature (Td= Tleaf – ambient temperature) of several species of lianas and their host trees during ENSO and non-ENSO years to evaluate if the presence of lianas affects the Td of their host trees, and if leaves of lianas and their host trees exhibit differences in Td. Our results suggest that close to midday, the presence of lianas does not affect the Td of their host trees; however, lianas tend to have higher values of Td than their hosts across seasons, in both ENSO and non-ENSO years. Although lianas and trees tend to have similar physiological-temperature responses, differences in Td could lead to significant differences in rates of photosynthesis and respiration based temperature response curves. Future models should thus consider differences in leaf temperature between these life forms to achieve robust predictions of productivity.

Patterns of lichen photosynthesis and respiration following prolonged frozen storage

1978 ◽  
Vol 56 (17) ◽  
pp. 2119-2123 ◽  
Author(s):  
Douglas W. Larson
Keyword(s):  
Light Intensity ◽  
Low Temperatures ◽  
Physiological Activity ◽  
Frozen Storage ◽  
Experimental Systems ◽  
Long Term Storage ◽  
Photosynthesis And Respiration ◽  
Term Storage ◽  
Respiratory Responses

The effect of prolonged frozen storage on patterns of photosynthesis and respiration in the lichen Alectoria ochroleuca (Hoffm.) Massal. has been examined. The results indicate that this plant not only survives long-term exposure to low temperatures but also that its basic photosynthetic and respiratory responses to temperature, light intensity, and thallus moisture content are altered very little by long-term storage at −60 °C. This maintenance not only of absolute viability but also of the more subtle patterns of physiological activity suggests that such storage may be used to hold lichen material for use in multivariate experimental systems which require replicates having identical field pretreatment.

scholarly journals Photosynthesis and Respiration by the Flag Leaf and Components of the Ear During Grain Development In Wheat

1970 ◽  
Vol 23 (2) ◽  
pp. 245 ◽  
Author(s):  
LT Evans ◽  
HM Rawson
Keyword(s):  
Light Intensity ◽  
Dark Respiration ◽  
Flag Leaf ◽  
Gas Analysis ◽  
Constant Light ◽  
Grain Development ◽  
Flag Leaves ◽  
Photosynthesis And Respiration

Rates of photosynthesis and dark respiration of the ears and flag leaves of three varieties of wheat grown at 21 DC under a constant light intensity of 3200 f.c. were measured by infrared gas analysis twice weekly throughout the period of grain development. Measurements were made on both the intact ears and the separated grains and ear structures, in air and in a mixture of nitrogen plus 320 p.p.m. C02. Dry weights of the grains, ears, and main stems were also determined.

Efficiency of solar energy conversion as a function of light intensity

2008 ◽  
Vol 80 (10) ◽  
pp. 2069-2077
Author(s):  
Sergei Varfolomeev
Keyword(s):  
Solar Energy ◽  
Light Intensity ◽  
Energy Conversion ◽  
Solar Energy Conversion ◽  
Maximum Efficiency ◽  
Light Illumination ◽  
Photosynthetic System ◽  
System Parameters ◽  
Photosynthetic Antenna ◽  
Photosynthesis And Respiration

The kinetic model has been developed for disserting the efficiency of solar energy conversion as a function of light intensity. A comparison of theory with experimental results shows that the model provides a satisfactory agreement. We have estimated the essential parameters of photosynthetic systems (the size of the photosynthetic antenna, the rate of electron transport, the correlation between photosynthesis and respiration) that are responsible for reaching the maximum efficiency at "one sun" and "one hundred suns" light illumination intensities. Recommendations for the improvement of photosynthetic system parameters using genetic engineering methods are also provided.

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