Chlorophyll fluorescence quenching and violaxanthin deepoxidation of FBPase antisense plants at low light intensities and low temperatures

1995 ◽  
Vol 95 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Joachim Fisahn ◽  
Jens Kossmann ◽  
Gernot Matzke ◽  
Heidemarie Fuss ◽  
Wolfgang Bilger ◽  
...  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Fluorescence Quenching ◽  
Low Temperatures ◽  
Low Light ◽  
Chlorophyll Fluorescence Quenching ◽  
Light Intensities

Analysis of the control of photosynthesis in C 4 plants by changes in light and carbon dioxide

1989 ◽  
Vol 323 (1216) ◽  
pp. 339-355 ◽  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Fluorescence Quenching ◽  
Electron Flow ◽  
Calvin Cycle ◽  
Carbon Assimilation ◽  
Photon Flux ◽  
Low Light ◽  
Chlorophyll Fluorescence Quenching ◽  
Photosynthetic Carbon ◽  
Photosynthetic Carbon Assimilation

Parallel measurements of contents of photosynthetic intermediates, activities of enzymes of photosynthetic carbon assimilation, gas-exchange rates and components of chlorophyll-fluorescence quenching in leaves of C 4 plants are considered in relation to changes in photon flux density (PFD) and CO 2 . The influence of varying light and CO 2 concentration upon changes in the amounts of phosphoenolpyruvate (PEP) in leaves of C 4 plants during steady-state photosynthesis are interpreted in terms of the regulatory properties of PEP carboxylase and in terms of feedback interactions between the Calvin cycle and the C 4 cycle. Relations between electron transport and carbon assimilation are discussed in terms of the regulation of the supply of ATP and NADPH and the demands of carbon assimilation. In low light these relations differ in C 3 and C 4 plants. The lag in photosynthetic carbon assimilation in maize that follows a decrease in PFD has been analysed. The changes that occur in enzyme activities, metabolites and components of chlorophyll-fluorescence quenching following the transition from high to low light indicate that diminished production of ATP and NADPH is responsible for the lag in photosynthetic carbon assimilation and may reflect a stimulation of cyclic electron flow to make up a deficit in ATP.

Sign in / Sign up

Export Citation Format

Share Document