The relationship between carbon dioxide fixation and chlorophyll a fluorescence during induction of photosynthesis in maize leaves at different temperatures and carbon dioxide concentrations

Planta ◽  
1984 ◽  
Vol 160 (6) ◽  
pp. 550-558 ◽  
Author(s):  
C. R. Ireland ◽  
S. P. Long ◽  
N. R. Baker
Keyword(s):  
Carbon Dioxide ◽  
Chlorophyll A ◽  
Chlorophyll A Fluorescence ◽  
Carbon Dioxide Fixation ◽  
Carbon Dioxide Concentrations ◽  
Maize Leaves ◽  
Different Temperatures ◽  
The Relationship

The relationship between water status and chlorophyll a fluorescence in grapes (Vitis spp.)

2009 ◽  
Vol 51 (2) ◽  
pp. 193-199 ◽  
Author(s):  
Harrison Wright ◽  
John DeLong ◽  
Rajasekaran Lada ◽  
Robert Prange
Keyword(s):  
Chlorophyll A ◽  
Chlorophyll A Fluorescence ◽  
Water Status ◽  
The Relationship ◽  
Vitis Spp

scholarly journals Alkenone isotopes show evidence of active carbon concentrating mechanisms in coccolithophores as aqueous carbon dioxide concentrations fall below 7 μmol L<sup>−1</sup>

2020 ◽  
Author(s):  
Marcus P. S. Badger
Keyword(s):  
Carbon Dioxide ◽  
Cell Membrane ◽  
Ice Core ◽  
Co2 Concentration ◽  
Global Ocean ◽  
Carbon Dioxide Concentrations ◽  
Show Evidence ◽  
Carbon Concentrating Mechanisms ◽  
Through Diffusion ◽  
The Relationship

Abstract. Coccolithophores and other haptophyte algae acquire the carbon required for metabolic processes from the water in which they live. Whether carbon is actively moved across the cell membrane via a carbon concentrating mechanism, or passively through diffusion, is important for haptophyte biochemistry. The possible utilisation of carbon concentrating mechanisms also has the potential to over-print one proxy method by which ancient atmospheric CO2 is reconstructed using alkenone isotopes. Here I show that carbon concentrating mechanisms are likely used when aqueous carbon dioxide concentrations are below 7 μmol L−1. I use published alkenone based CO2 reconstructions from multiple sites over the Pleistocene, which allows comparison to be made with ice core CO2 records. Interrogating these records reveal that the relationship between proxy- and ice core-CO2 breaks down when local aqueous CO2 concentration falls below 7 μmol L−1. The recognition of this threshold explains why many alkenone based CO2 records fail to accurately replicate ice core CO2 records, and suggests the alkenone proxy is likely robust for much of the Cenozoic when this threshold was unlikely to be reached in much of the global ocean.

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