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2012•Journal of Inner Mongolia Agricultural UniversityRequires access

EFFECTS OF DOWNY MILDEW INFESTATION ON THE ACTIVITIES OF FOUR DEFENSIVE ENZYMES IN CUCUMBER LEAVES

Meng Qing

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Abstract

By using the cucumber infested artificially by,this paper investigated the influences of downy mildew infestation on the activities of phenylalnine ammonialyase(PAL),polyphenol oxidase(PPO),peroxidase(POD) and superoxide dismutase(SOD) in cucumber leaf.The activities of four main defense enzymes in cucumber leaf increased in different degrees after infestation.There were significant differences of all four main defense enzymes between serious infestation or its system control and health control(P0.05).Only PAL and POD indicated significant difference between slight infestation or its system control and health control(P0.05) while PPO and SOD showed no significant difference(P0.05).The results indicated that the downy mildew infection induced the cucumber to produce systemic resistance.

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What this paper is about

By using the cucumber infested artificially by,this paper investigated the influences of downy mildew infestation on the activities of phenylalnine ammonialyase(PAL),polyphenol oxidase(PPO),peroxidase(POD) and superoxide dismutase(SOD) in cucumber leaf.The activities of four main defense enzymes in cucumber leaf increased in different degrees after infestation.There were significant differences of all four main defense enzymes between serious infestation or its system control and health control(P0.05).Only PAL and POD indicated significant difference between slight infestation or its system control and health control(P0.05) while PPO and SOD showed no significant difference(P0.05).The results indicated that the downy mildew infection induced the cucumber to produce systemic resistance.

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Available abstract

By using the cucumber infested artificially by,this paper investigated the influences of downy mildew infestation on the activities of phenylalnine ammonialyase(PAL),polyphenol oxidase(PPO),peroxidase(POD) and superoxide dismutase(SOD) in cucumber leaf.The activities of four main defense enzymes in cucumber leaf increased in different degrees after infestation.There were significant differences of all four main defense enzymes between serious infestation or its system control and health control(P0.05).Only PAL and POD indicated significant difference between slight infestation or its system control and health control(P0.05) while PPO and SOD showed no significant difference(P0.05).The results indicated that the downy mildew infection induced the cucumber to produce systemic resistance.

Key concepts: Downy mildew, Infestation, Polyphenol oxidase, Point of delivery, Peroxidase, Biology, Superoxide dismutase, Horticulture

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EFFECTS OF DOWNY MILDEW INFESTATION ON THE ACTIVITIES OF FOUR DEFENSIVE ENZYMES IN CUCUMBER LEAVES — Research Paper | ScholarLens