Effect of copper excess on superoxide dismutase,catalase, and peroxidase activities in sunflower seedlings (<Emphasis Type="Italic">Helianthus annuus</Emphasis> L.) |
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Authors: | Hager Jouili Ezzeddine El Ferjani |
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Institution: | (1) Laboratoire de Biologie et Physiologie Cellulaires Faculté des Sciences de Bizerte, 7021 Zarzouna, Bizerte, Tunisia |
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Abstract: | The changes in lipid peroxidation, antioxidative and lignifying enzyme activities were studied in leaves and stems of Cu-stressed
sunflower seedlings. In both organs, membrane lipid peroxidation was enhanced by copper treatment. Additionally, catalase
(EC 1.11.1.6) and superoxide dismutase (EC 1.15.1.1) activities were modulated: The activity of superoxide dismutase was enhanced
in both plant organs. Differently, catalase activity was not affected in leaves but significantly reduced in stems. Peroxidase
(EC 1.11.1.7) activities were also changed. Guaiacol peroxidase activity was increased in leaves and stems. In the same way,
electrophoretic analysis of the anionic isoperoxidases involved in lignification (syringaldazine peroxidase) revealed qualitative
and quantitative changes on the isoenzyme patterns. These modifications were accompanied by the increase of the NADH-oxidase
activity in ionically cell wall bound fraction. It appeared that the growth delay caused by copper excess could be related
to the activation of lignifying peroxidases. |
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Keywords: | Catalase Copper Helianthus annuus Peroxidases Superoxide dismutase |
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