Effects of pH on the induction of phosphoenolpyruvate carboxylase kinase in Kalanchoë fedtschenkoi

Paterson, K. M. and Nimmo, H. G. (2000) Effects of pH on the induction of phosphoenolpyruvate carboxylase kinase in Kalanchoë fedtschenkoi. Plant Science, 154(2), pp. 135-141. (doi: 10.1016/S0168-9452(99)00249-6) (PMID:10729612)

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Abstract

Previous work has shown that an increase in cytosolic pH plays an important role in the induction of phosphoenolpyruvate carboxylase (PEPc) kinase by light in C4 plants. The potential involvement of a similar effect in the induction of PEPc kinase in the Crassulacean acid metabolism (CAM) plant Kalanchoë fedtschenkoi was assessed using leaf disks. Treatment of disks with the weak base NH4Cl did not affect induction of the kinase. Prolonged treatment of disks with weak acids prevented both decarboxylation of malate during the day and induction of the kinase in the following night, but short treatments had no effect. The data are consistent with the view that a high cytosolic malate content can prevent induction of phosphoenolpyruvate carboxylase kinase. Changes in cytosolic pH may affect induction of the kinase in CAM plants by a secondary effect rather than as part of a primary signalling pathway.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Nimmo, Professor Hugh
Authors: Paterson, K. M., and Nimmo, H. G.
College/School:College of Medical Veterinary and Life Sciences > School of Molecular Biosciences
Journal Name:Plant Science
Publisher:Elsevier
ISSN:0168-9452
ISSN (Online):1873-2259
Published Online:20 March 2000

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