Responses of Crassulacean Acid Metabolism (CAM) to Increasing and Decreasing Water Stress in Plants in the Southern Namib Desert

1983 ◽  
pp. 155-163 ◽  
Author(s):  
D. J. von Willert ◽  
E. Brinckmann ◽  
B. Scheitler ◽  
B. M. Eller
Keyword(s):  
Water Stress ◽  
Crassulacean Acid Metabolism ◽  
Acid Metabolism ◽  
Namib Desert

Crassulacean Acid Metabolism in Orchids under Water Stress

1982 ◽  
Vol 143 (3) ◽  
pp. 294-297 ◽  
Author(s):  
C. F. Fu ◽  
C. S. Hew
Keyword(s):  
Water Stress ◽  
Crassulacean Acid Metabolism ◽  
Acid Metabolism

scholarly journals Phosphoenolpyruvate carboxylase from pennywort (Umbilicus rupestris). Changes in properties after exposure to water stress

1984 ◽  
Vol 218 (2) ◽  
pp. 387-393 ◽  
Author(s):  
P P Daniel ◽  
J A Bryant ◽  
F I Woodward
Keyword(s):  
Water Stress ◽  
Phosphoenolpyruvate Carboxylase ◽  
Crassulacean Acid Metabolism ◽  
Acid Metabolism ◽  
Marked Decrease ◽  
Cam Plants ◽  
Allosteric Inhibitor ◽  
Allosteric Effector ◽  
Incomplete Form ◽  
C3 Photosynthesis

Umbilicus rupestris (pennywort) switches from C3 photosynthesis to an incomplete form of crassulacean acid metabolism (referred to as ‘CAM-idling’) when exposed to water stress (drought). This switch is accompanied by an increase in the activity of phosphoenolpyruvate carboxylase. This enzyme also shows several changes in properties, including a marked decrease in sensitivity to acid pH, a lower Km for phosphoenolpyruvate, very much decreased sensitivity to the allosteric inhibitor malate, and increased responsiveness to the allosteric effector glucose 6-phosphate. The Mr of the enzyme remains unchanged, at approx. 185 000. These changes in properties of phosphoenolpyruvate carboxylase are discussed in relation to the roles of the enzyme in C3 and in CAM plants.

Effect of Different CO2 Regimes on the Induction of Crassulacean Acid Metabolism in Mesembryanthemum crystallinum L

1979 ◽  
Vol 6 (6) ◽  
pp. 589 ◽  
Author(s):  
K Winter
Keyword(s):  
Water Stress ◽  
Phosphoenolpyruvate Carboxylase ◽  
Crassulacean Acid Metabolism ◽  
Acid Metabolism ◽  
High Salinity ◽  
Stomatal Closure ◽  
Initial Step ◽  
Mesembryanthemum Crystallinum ◽  
Initial Event ◽  
Response To Water

Induction of crassulacean acid metabolism (CAM) in Mesembryanthemum crystallinum in response to high salinity was studied in plants grown in different CO2 regimes to determine whether the induction of CAM could be controlled by CO2 supply in the light and dark; a possible consequence of stomatal closure in response to water stress. The activity of extractable phosphoenolpyruvate carboxylase (EC 4.1.1.31) and the nocturnal change in malate content were followed at frequent intervals after onset of the treatments. The results suggest that the initial event during the induction of CAM is a change in the biochemical apparatus, indicated by the activity of phosphoenolpyruvate carboxylase, which then leads to the day/night fluctuations of malate synthesis typical of CAM. This initial step is not controlled by the availability of CO2 in the light or dark.

scholarly journals Effect of Severe Water Stress on Aspects of Crassulacean Acid Metabolism in Xerosicyos

1993 ◽  
Vol 103 (4) ◽  
pp. 1089-1096 ◽  
Author(s):  
B. Bastide ◽  
D. Sipes ◽  
J. Hann ◽  
I. P. Ting
Keyword(s):  
Water Stress ◽  
Crassulacean Acid Metabolism ◽  
Acid Metabolism ◽  
Severe Water Stress

Availability of water controls Crassulacean acid metabolism in succulents of the Richtersveld (Namib desert, South Africa)

Planta ◽  
1985 ◽  
Vol 164 (1) ◽  
pp. 44-55 ◽  
Author(s):  
D. J. von Willert ◽  
E. Brinckmann ◽  
B. Scheitler ◽  
B. M. Eller
Keyword(s):  
South Africa ◽  
Crassulacean Acid Metabolism ◽  
Acid Metabolism ◽  
Namib Desert
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