NDLI: Changes in Properties of Phosphoenolpyruvate Carboxylase with Induction of Crassulacean Acid Metabolism (CAM) in the C$

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Changes in Properties of Phosphoenolpyruvate Carboxylase with Induction of Crassulacean Acid Metabolism (CAM) in the C$_{4}$ Plant Portulaca Oleracea

Content Provider	Springer Nature Link
Author	Mazen, A.M.A.
Copyright Year	2001
Abstract	Aiming at understanding the odd case of CAM expression by a C$_{4}$ plant, some properties of phosphoenolpyruvate carboxylase (PEPC, EC 4.1.1.31, orthophosphate: oxaloacetate carboxylyase, phosphorylating) were comparatively studied in leaves of CAM-expressing and non-expressing Portulaca oleracea L. plants. CAM expression was induced by growing plants under an 8-h photoperiod and under water-stress. CAM induction in leaves of these plants (designated as CAM) is indicated by the nocturnal acidification and by the clear diurnal oscillation pattern and amplitude of acidity, malic acid, and PEPC activity characteristic of CAM plants. Treatment of the other plant group (designated as C$_{4}$) by growth under a 16-h photoperiod and well-watered conditions did not induce expression of the tested criteria of CAM in plants. In these C$_{4}$ plants, the mentioned CAM criteria were undetectable. PEPC from CAM and C$_{4}$ Portulaca responded differently to any of the studied assay conditions or effectors. For example, extent and timing of sensitivity of PEPC to pH change, inhibition by malate, activation by glucose-6-phosphate or inorganic phosphate, and the enzyme affinity to the substrate PEP were reversed with induction of CAM from the C$_{4}$-P. oleracea. These contrasting responses indicate distinct kinetic and regulatory properties of PEPC of the two modes. Thus by shifting to CAM in the C$_{4}$ Portulaca a new PEPC isoform may be synthesised to meet CAM requirements. Simultaneous occurrence of both C$_{4}$ and CAM is suggested in P. oleracea when challenged with growth under stress.
Starting Page	385
Ending Page	391
Page Count	7
File Format	PDF
ISSN	03003604
Journal	Photosynthetica
Volume Number	38
Issue Number	3
e-ISSN	15739058
Language	English
Publisher	Springer Netherlands
Publisher Date	2000-04-01
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science

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