scholarly journals Phosphorylation of Phosphoenolpyruvate Carboxylase Is Essential for Maximal and Sustained Dark CO2 Fixation and Core Circadian Clock Operation in the Obligate Crassulacean Acid Metabolism Species Kalanchoë fedtschenkoi

2017 ◽  
Vol 29 (10) ◽  
pp. 2519-2536 ◽  
Author(s):  
Susanna F. Boxall ◽  
Louisa V. Dever ◽  
Jana Kneřová ◽  
Peter D. Gould ◽  
James Hartwell
Keyword(s):  
Circadian Clock ◽  
Phosphoenolpyruvate Carboxylase ◽  
Crassulacean Acid Metabolism ◽  
Co2 Fixation ◽  
Acid Metabolism ◽  
Dark Co2 Fixation

Induction and reversal of crassulacean acid metabolism in Calandrinia polyandra: effects of soil moisture and nutrients

2011 ◽  
Vol 38 (7) ◽  
pp. 576 ◽  
Author(s):  
Klaus Winter ◽  
Joseph A. M. Holtum
Keyword(s):  
Crassulacean Acid Metabolism ◽  
Co2 Fixation ◽  
Acid Metabolism ◽  
Co2 Exchange ◽  
Edaphic Conditions ◽  
Whole Plant ◽  
Negative Effect ◽  
Photosynthetic Plasticity ◽  
Dark Co2 Fixation

Calandrinia polyandra Benth. (Montiaceae), an annual succulent herb endemic to Australia, is an exemplary facultative crassulacean acid metabolism (CAM) plant as demonstrated by continuous whole-plant lifetime CO2 exchange measurements under controlled conditions in the laboratory. Reduced soil water availability induced a shift from solely daytime CO2 fixation to dark CO2 fixation. The shift from C3 photosynthesis to CAM was reversible either upon rewatering alone, or upon a combination of rewatering and addition of nutrients. These observations highlight the role of edaphic conditions in controlling CAM expression in a plant that has the option of fixing CO2 either during the day or during the night, providing further evidence that this extreme form of photosynthetic plasticity is primarily controlled by the environment rather than plant ontogeny. The stimulating effect of soil nutrients on CO2 fixation in the light and its negative effect on dark CO2 fixation have not been described previously and deserve further attention. In the most widely used CAM model system, the halophytic Mesembryanthemum crystallinum L., CAM is typically induced by high salinity, and some metabolic responses may be CAM-unrelated and related to salt stress per se. C. polyandra could be an excellent complementary system for studying the biochemical and molecular foundations of CAM because drought stress elicits a complete C3 to CAM transition.

How to tell the time: the regulation of phosphoenolpyruvate carboxylase in Crassulacean acid metabolism (CAM) plants

2003 ◽  
Vol 31 (3) ◽  
pp. 728-730 ◽  
Author(s):  
H.G. Nimmo
Keyword(s):  
Circadian Rhythms ◽  
Phosphoenolpyruvate Carboxylase ◽  
Crassulacean Acid Metabolism ◽  
Acid Metabolism ◽  
Circadian Oscillator ◽  
Cam Plants ◽  
Reversible Phosphorylation ◽  
Circadian Expression ◽  
Phosphoenolpyruvate Carboxylase Kinase ◽  
Co2 Metabolism

Crassulacean acid metabolism (CAM) plants exhibit persistent circadian rhythms of CO2 metabolism. These rhythms are driven by changes in the flux through phosphoenolpyruvate carboxylase, which is regulated by reversible phosphorylation in response to a circadian oscillator. This article reviews progress in our understanding of the circadian expression of phosphoenolpyruvate carboxylase kinase.

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