Does Iodine Biofortification Affect Oxidative Meta

Authors: Begoña Blasco Juan Jose Ríos Rocío Leyva Luis Miguel Cervilla Eva SánchezRodríguez María Mar RubioWilhelmi Miguel Angel Rosales Juan Manuel Ruiz Luis Romero

Publish Date: 2010/09/14

Volume: 142, Issue: 3, Pages: 831-842

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Abstract

Plants produce low levels of reactive oxygen species ROS which form part of basic cell chemical communication however different types of stress can lead to an overexpression of ROS that can damage macromolecules essential for plant growth and development Iodine is vital to human health and iodine biofortification programs help improve the human intake through plant consumption This biofortification process has been shown to influence the antioxidant capacity of lettuce plants suggesting that the oxidative metabolism of the plant may be affected The results of this study demonstrate that the response to oxidative stress is variable and depends on the form of iodine applied Application of iodide I− to lettuce plants produces a reduction in superoxide dismutase SOD activity and an increase in catalase CAT and Lgalactono dehydrogenase enzyme activities and in the activity of antioxidant compounds such as ascorbate AA and glutathione This did not prove a very effective approach since a dose of 80 μM produced a reduction in the biomass of the plants For its part application of iodate IO 3 − produced an increase in the activities of SOD ascorbate peroxidase and CAT the main enzymes involved in ROS detoxification it also increased the concentration of AA and the regenerative activities of the Halliwell–Asada cycle These data confirm the nonphytotoxicity of IO 3 − since there is no lipid peroxidation or biomass reduction According to our results the ability of IO 3 − to induce the antioxidant system indicates that application of this form of iodine may be an effective strategy to improve the response of plants to different types of stress

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