Ultrastructure and Lipid Alterations Induced by Cadmium in Tomato (Lycopersicon esculentum) Chloroplast Membranes
Identifieur interne : 000183 ( France/Analysis ); précédent : 000182; suivant : 000184Ultrastructure and Lipid Alterations Induced by Cadmium in Tomato (Lycopersicon esculentum) Chloroplast Membranes
Auteurs : W. Djebali [Tunisie] ; M. Zarrouk [Tunisie] ; R. Brouquisse [France] ; S. El Kahoui [Tunisie] ; F. Limam [Tunisie] ; M. H. Ghorbel [Tunisie] ; W. Chaïbi [Tunisie]Source :
- Plant Biology [ 1435-8603 ] ; 2005-07.
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Abstract
Abstract: The effects of cadmium (Cd) uptake on ultrastructure and lipid composition of chloroplasts were investigated in 28‐day‐old tomato plants (Lycopersicon esculentum var. Ibiza F1) grown for 10 days in the presence of various concentrations of CdCl2. Different growth parameters, lipid and fatty acid composition, lipid peroxidation, and lipoxygenase activity were measured in the leaves in order to assess the involvement of this metal in the generation of oxidative stress. We first observed that the accumulation of Cd increased with external metal concentration, and was considerably higher in roots than in leaves. Cadmium induced a significant inhibition of growth in both plant organs, as well as a reduction in the chlorophyll and carotenoid contents in the leaves. Ultrastructural investigations revealed that cadmium induced disorganization in leaf structure, essentially marked by a lowered mesophyll cell size, reduced intercellular spaces, as well as severe alterations in chloroplast fine structure, which exhibits disturbed shape and dilation of thylakoid membranes. High cadmium concentrations also affect the main lipid classes, leading to strong changes in their composition and fatty acid content. Thus, the exposure of tomato plants to cadmium caused a concentration‐related decrease in the fatty acid content and a shift in the composition of fatty acids, resulting in a lower degree of fatty acid unsaturation in chloroplast membranes. The level of lipid peroxides and the activity of lipoxygenase were also significantly enhanced at high Cd concentrations. These biochemical and ultrastructural changes suggest that cadmium, through its effects on membrane structure and composition, induces premature senescence of leaves.
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DOI: 10.1055/s-2005-837696
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El Kahoui</name><affiliation wicri:level="1"><country xml:lang="fr">Tunisie</country><wicri:regionArea>Laboratoire Interactions Légumineuses‐Microorganismes, Institut National de Recherche Scientifique et Technique, BP 95‐2050 Hammam‐Lif</wicri:regionArea><wicri:noRegion>BP 95‐2050 Hammam‐Lif</wicri:noRegion></affiliation></author><author><name sortKey="Limam, F" sort="Limam, F" uniqKey="Limam F" first="F." last="Limam">F. Limam</name><affiliation wicri:level="1"><country xml:lang="fr">Tunisie</country><wicri:regionArea>Laboratoire Interactions Légumineuses‐Microorganismes, Institut National de Recherche Scientifique et Technique, BP 95‐2050 Hammam‐Lif</wicri:regionArea><wicri:noRegion>BP 95‐2050 Hammam‐Lif</wicri:noRegion></affiliation></author><author><name sortKey="Ghorbel, M H" sort="Ghorbel, M H" uniqKey="Ghorbel M" first="M. H." last="Ghorbel">M. H. Ghorbel</name><affiliation wicri:level="1"><country xml:lang="fr">Tunisie</country><wicri:regionArea>Laboratoire de Physiologie Végétale, U.R. “Nutrition et Métabolisme Azotés et Protéines de Stress”, Département de Biologie, Faculté des Sciences de Tunis, Campus Universitaire, 1060 Tunis</wicri:regionArea><placeName><settlement type="city">Tunis</settlement><region nuts="2">Gouvernorat de Tunis</region></placeName></affiliation></author><author><name sortKey="Chaibi, W" sort="Chaibi, W" uniqKey="Chaibi W" first="W." last="Chaïbi">W. 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Ibiza F1) grown for 10 days in the presence of various concentrations of CdCl2. Different growth parameters, lipid and fatty acid composition, lipid peroxidation, and lipoxygenase activity were measured in the leaves in order to assess the involvement of this metal in the generation of oxidative stress. We first observed that the accumulation of Cd increased with external metal concentration, and was considerably higher in roots than in leaves. Cadmium induced a significant inhibition of growth in both plant organs, as well as a reduction in the chlorophyll and carotenoid contents in the leaves. Ultrastructural investigations revealed that cadmium induced disorganization in leaf structure, essentially marked by a lowered mesophyll cell size, reduced intercellular spaces, as well as severe alterations in chloroplast fine structure, which exhibits disturbed shape and dilation of thylakoid membranes. High cadmium concentrations also affect the main lipid classes, leading to strong changes in their composition and fatty acid content. Thus, the exposure of tomato plants to cadmium caused a concentration‐related decrease in the fatty acid content and a shift in the composition of fatty acids, resulting in a lower degree of fatty acid unsaturation in chloroplast membranes. The level of lipid peroxides and the activity of lipoxygenase were also significantly enhanced at high Cd concentrations. These biochemical and ultrastructural changes suggest that cadmium, through its effects on membrane structure and composition, induces premature senescence of leaves.</div></front></TEI><affiliations><list><country><li>France</li><li>Tunisie</li></country><region><li>Auvergne-Rhône-Alpes</li><li>Gouvernorat de Tunis</li><li>Rhône-Alpes</li></region><settlement><li>Grenoble</li><li>Tunis</li></settlement></list><tree><country name="Tunisie"><region name="Gouvernorat de Tunis"><name sortKey="Djebali, W" sort="Djebali, W" uniqKey="Djebali W" first="W." last="Djebali">W. Djebali</name></region><name sortKey="Chaibi, W" sort="Chaibi, W" uniqKey="Chaibi W" first="W." last="Chaïbi">W. Chaïbi</name><name sortKey="El Kahoui, S" sort="El Kahoui, S" uniqKey="El Kahoui S" first="S." last="El Kahoui">S. El Kahoui</name><name sortKey="Ghorbel, M H" sort="Ghorbel, M H" uniqKey="Ghorbel M" first="M. H." last="Ghorbel">M. H. Ghorbel</name><name sortKey="Limam, F" sort="Limam, F" uniqKey="Limam F" first="F." last="Limam">F. Limam</name><name sortKey="Zarrouk, M" sort="Zarrouk, M" uniqKey="Zarrouk M" first="M." last="Zarrouk">M. Zarrouk</name></country><country name="France"><region name="Auvergne-Rhône-Alpes"><name sortKey="Brouquisse, R" sort="Brouquisse, R" uniqKey="Brouquisse R" first="R." last="Brouquisse">R. Brouquisse</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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