Characteristics of C4 plants containing varying levels of phosphoenolpyruvate carboxylase

1994 ◽  
Vol 22 (4) ◽  
pp. 404S-404S
Author(s):  
LOUISA DEVER ◽  
RICHARD C. LEEGOOD ◽  
PETER J. LEA
Keyword(s):  
Phosphoenolpyruvate Carboxylase ◽  
C4 Plants

Possible involvement of phosphoenolpyruvate carboxylase and NAD-malic enzyme in response to drought stress. A case study: a succulent nature of the C4-NAD-ME type desert plant, Salsola lanata (Chenopodiaceae)

2017 ◽  
Vol 44 (12) ◽  
pp. 1219
Author(s):  
Zhibin Wen ◽  
Mingli Zhang
Keyword(s):  
Enzyme Activity ◽  
Drought Stress ◽  
Phosphoenolpyruvate Carboxylase ◽  
Malic Enzyme ◽  
C4 Plants ◽  
Leaf Water Content ◽  
Transcriptional Level ◽  
Desert Plant ◽  
Severe Stress ◽  
Real Time Quantitative Pcr

The co-ordination between the primary carboxylating enzyme phosphoenolpyruvate carboxylase (PEPC) and the further decarboxylating enzymes is crucial to the efficiency of the CO2-concentrating mechanism in C4 plants, and investigations on more types of C4 plants are needed to fully understand their adaptation mechanisms. In this study we investigated the effect of drought on carboxylating enzyme PEPC, and the further decarboxylating NAD-malic enzyme (NAD-ME) of Salsola lanata Pall. (Chenopodiaceae) – an annual succulent C4-NAD-ME subtype desert plant. We investigated enzyme activity at the transcriptional level with real-time quantitative PCR and at the translational level by immunochemical methods, and compared S. lanata with other forms of studied C4 plants under drought stress. Results showed that only severe stress limited PEPC enzyme activity (at pH 8.0) of S. lanata significantly. Considering that PEPC enzyme activity (at pH 8.0) was not significantly affected by phosphorylation, the decrease of PEPC enzyme activity (at pH 8.0) of S. lanata under severe stress may be related with decreased PEPC mRNA. The suggestion of increased phosphorylation of the PEPC enzyme in plants under moderate stress was supported by the ratio of PEPC enzyme activity at pH 7.3/8.0, as PEPC enzyme is inhibited by L-malate and the evidence of the 50% inhibiting concentration of L-malate. NAD-ME activity decreased significantly under moderate and severe stress, and coincided with a change of leaf water content rather than the amount of α-NAD-ME mRNA and protein. Leaf dehydration may cause the decrease of NAD-ME activity under water stress. Compared with other C4 plants, the activities of PEPC and NAD-ME of S. lanata under drought stress showed distinct features.

scholarly journals Detecting Photoactivation of Phosphoenolpyruvate Carboxylase in C4 Plants

1985 ◽  
Vol 77 (2) ◽  
pp. 300-302 ◽  
Author(s):  
George Karabourniotis ◽  
Yiannis Manetas ◽  
Nikos A. Gavalas
Keyword(s):  
Phosphoenolpyruvate Carboxylase ◽  
C4 Plants

scholarly journals Photoregulation of Phosphoenolpyruvate Carboxylase in Salsola soda L. and Other C4 Plants

1983 ◽  
Vol 73 (3) ◽  
pp. 735-739 ◽  
Author(s):  
George Karabourniotis ◽  
Yiannis Manetas ◽  
Nikos A. Gavalas
Keyword(s):  
Phosphoenolpyruvate Carboxylase ◽  
C4 Plants
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