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JXB Advance Access published online on November 28, 2003
Journal of Experimental Botany, doi:10.1093/jxb/erh001
© 2003 by Oxford University Press
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Received April 28, 2003; accepted June 26, 2003
© 2003 Society for Experimental Biology

FOCUS PAPER

Targets of stress-induced oxidative damage in plant mitochondria and their impact on cell carbon/nitrogen metabolism

Nicolas L. Taylor 1, David A. Day 1, and A. Harvey Millar 1*

1 Biochemistry and Molecular Biology, School of Biomedical and Chemical Sciences, Faculty of Life and Physical Sciences, The University of Western Australia, 35, Stirling Highway, Crawley, WA 6009, Australia

* To whom correspondence should be addressed. E-mail: hmillar{at}cyllene.uwa.edu.au.


  Abstract

Plant mitochondria link the cellular processes of carbon and nitrogen metabolism through the tricarboxylic acid cycle and the photorespiratory cycle. Environmental stresses lead to damage of specific mitochondrial targets through the direct action of reactive oxygen species and indirect action of lipid peroxidation products. Uncovering the extent of this damage, the exact sites of damage and the mechanisms of avoidance and/or repair remains a largely unresearched challenge for plant scientists. Damage to Fe-S centres and proteins containing lipoic acid moieties appear to predominate in current reports. Substantial evidence that both TCA cycle and photorespiratory capacity of mitochondria are sensitive sites for damage is highlighted and the implications for mitochondrial-dependent carbon and nitrogen metabolism are discussed.

Key words: Active oxygen species, carbon metabolism, environmental stress, glycine decarboxylase, lipid peroxidation, nitrogen metabolism, plant mitochondria.


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