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Journal of Experimental Botany, Vol. 53, No. 371, pp. 1081-1088, May 2002
© 2002 Oxford University Press

Original Papers

Role of sugars and organic acids in regulating the concentration and activity of the alternative oxidase in Poa annua roots

Frank F. Millenaar1 6, Miquel A. Gonzalez-Meler2,3, James N. Siedow2, Anneke M. Wagner4 and Hans Lambers1,5

1Plant Ecophysiology, Utrecht University, Sorbonnelaan 16, 3584 CA Utrecht, The Netherlands
2Botany Department-DCMB Group, Duke University, Durham, North Carolina, USA
3Department of Biological Sciences, University of Illinois, 845 West Taylor Street, Chicago, IL 60607, USA
4Department of Molecular Cell Physiology, Vrije Universiteit, Amsterdam, The Netherlands
5School of Plant Biology, Faculty of Natural and Agricultural Sciences, The University of Western Australia, 35 Stirling Highway, Crawley WA 6009 Australia.

Detached roots of Poa annua were used to study alternative oxidase protein expression upon the addition of sucrose, glucose, fructose, inositol, mannitol, citrate or malate, at a concentration of 1 or 10 mM for 24 h. After 24 h the capacity of cytochrome c oxidase was decreased equally in all treatments. Only citrate induced the expression of the alternative oxidase, especially at a concentration of 1 mM (15-fold). The activity of the alternative pathway (measured with the 18O-fractionation technique) was not affected by the addition of sucrose for 24 h as compared with time zero. However, after the addition of citrate or mannitol the activity of the alternative pathway decreased to almost zero. The discrepancy between the large increase in alternative oxidase protein concentration when citrate was applied and the concomitant decrease in alternative pathway activity is discussed.

Key words: Alternative oxidase, citrate, organic acid, Poa annua, sugar.


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