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JXB Advance Access originally published online on July 16, 2004
Journal of Experimental Botany 2004 55(403):1663-1669; doi:10.1093/jxb/erh199
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Journal of Experimental Botany, Vol. 55, No. 403, © Society for Experimental Biology 2004; all rights reserved

RESEARCH PAPER

Mitochondria are the main target for oxidative damage in leaves of wheat (Triticum aestivum L.)

Carlos Guillermo Bartoli*, Facundo Gómez, Dana Ethel Martínez and Juan José Guiamet

Instituto de Fisiología Vegetal, Universidad Nacional de La Plata, cc 327, (1900) La Plata, Argentina

* To whom correspondence should be addressed. Fax: +54 221 4233698. E-mail: barcap{at}way.com.ar

Photosynthesis, respiration, and other processes produce reactive oxygen species (ROS) that can cause oxidative modifications to proteins, lipids, and DNA. The production of ROS increases under stress conditions, causing oxidative damage and impairment of normal metabolism. In this work, oxidative damage to various subcellular compartments (i.e. chloroplasts, mitochondria, and peroxisomes) was studied in two cultivars of wheat differing in ascorbic acid content, and growing under good irrigation or drought. In well-watered plants, mitochondria contained 9–28-fold higher concentrations of oxidatively modified proteins than chloroplasts or peroxisomes. In general, oxidative damage to proteins was more intense in the cultivar with the lower content of ascorbic acid, particularly in the chloroplast stroma. Water stress caused a marked increase in oxidative damage to proteins, particularly in mitochondria and peroxisomes. These results indicate that mitochondria are the main target for oxidative damage to proteins under well-irrigated and drought conditions.

Key words: Ascorbic acid, chloroplasts, drought, mitochondria, oxidative damage, peroxisomes, Triticum aestivum L., wheat


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