A comparative study on the regulation of C3 and C4 carboxylation processes in the constitutive crassulacean acid metabolism (CAM) plant Kalanchoë daigremontiana and the C3-CAM intermediate Clusia minor

Planta ◽  
1997 ◽  
Vol 201 (3) ◽  
pp. 368-378 ◽  
Author(s):  
Anne M. Borland ◽  
Howard Griffiths
Keyword(s):  
Comparative Study ◽  
Crassulacean Acid Metabolism ◽  
Acid Metabolism ◽  
Cam Plant ◽  
Kalanchoë Daigremontiana ◽  
Kalanchoe Daigremontiana

Kinetic Properties of Phosphorylase and 6-Phosphofructokinase of Kalanchoe daigremontiana and Atriplex spongiosa

1975 ◽  
Vol 2 (3) ◽  
pp. 403 ◽  
Author(s):  
G Sutton
Keyword(s):  
Carbohydrate Metabolism ◽  
Crassulacean Acid Metabolism ◽  
Acid Metabolism ◽  
Kinetic Properties ◽  
C4 Plant ◽  
Cam Plants ◽  
Regulation Of Carbohydrate Metabolism ◽  
Cam Plant ◽  
Kalanchoë Daigremontiana ◽  
Kalanchoe Daigremontiana

The kinetic properties of phosphorylase (EC 2.4.1.1) and 6-phosphofructokinase (EC 2.7.1.11) extracted from a crassulacean acid metabolism (CAM) plant, Kalanchoe daigremontiana Hamet et Perrier, and a C4 plant, Atriplex spongiosa F. Muell., were compared. The phosphorylase from the CAM plant was strongly inhibited by P1 (1 mM), phosphoenolpyruvate (PEP) (2 mM) and glucose (4 mM). The C4 phosphorylase was less strongly inhibited by P1, and not at all by PEP or glucose. The C4 6-phosphofructokinase was, at Km levels of substrate, about 100 times more sensitive to inhibition by PEP than the CAM enzyme. These results are discussed as the basis for a biochemical regulation of carbohydrate metabolism in CAM plants at night.

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