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Oxalic Acid-induced H_2O_2 Production and Resistance to Downy Mildew in Cucumber Seedlings

DU Hui-fang

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Abstract

The activities of POD、SOD or CAT and H2O2 content were examined in cucumber leaves treated with oxalic acid or inoculated with Pseudoperonospora cubensis f.sp.cucumerinum.Results showed H2O2 content in leaves treated with oxalic acid were increased significantly,and accumulated faster than control after inoculation of Pseudoperonospora cubensis f.sp.cucumerinum.After leaf treated with oxalic acid,the activities of SOD or POD were enhanced while CAT activities were inhibited in leaves.The results showed that H2O2 may be concerned with induced resistance against downy mildew.The increase of H2O2 content may be related to the increase of SOD or POD activities and the decrease of CAT activities.That oxalic acid induced defense gene expression through H2O2 was one of the main mechanism of induced resistance.

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What this paper is about

The activities of POD、SOD or CAT and H2O2 content were examined in cucumber leaves treated with oxalic acid or inoculated with Pseudoperonospora cubensis f.sp.cucumerinum.Results showed H2O2 content in leaves treated with oxalic acid were increased significantly,and accumulated faster than control after inoculation of Pseudoperonospora cubensis f.sp.cucumerinum.After leaf treated with oxalic acid,the activities of SOD or POD were enhanced while CAT activities were inhibited in leaves.The results showed that H2O2 may be concerned with induced resistance against downy mildew.The increase of H2O2 content may be related to the increase of SOD or POD activities and the decrease of CAT activities.That oxalic acid induced defense gene expression through H2O2 was one of the main mechanism of induced resistance.

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Available abstract

The activities of POD、SOD or CAT and H2O2 content were examined in cucumber leaves treated with oxalic acid or inoculated with Pseudoperonospora cubensis f.sp.cucumerinum.Results showed H2O2 content in leaves treated with oxalic acid were increased significantly,and accumulated faster than control after inoculation of Pseudoperonospora cubensis f.sp.cucumerinum.After leaf treated with oxalic acid,the activities of SOD or POD were enhanced while CAT activities were inhibited in leaves.The results showed that H2O2 may be concerned with induced resistance against downy mildew.The increase of H2O2 content may be related to the increase of SOD or POD activities and the decrease of CAT activities.That oxalic acid induced defense gene expression through H2O2 was one of the main mechanism of induced resistance.

Key concepts: Downy mildew, Pseudoperonospora cubensis, Oxalic acid, Point of delivery, Inoculation, Horticulture, Chemistry, Biology

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Oxalic Acid-induced H_2O_2 Production and Resistance to Downy Mildew in Cucumber Seedlings — Research Paper | ScholarLens