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Induced resistance of postharvest apples to Botrytis cinerea induced by salicylic acid treatment

SHI Yali;ZHOU Huiling;TANG Yongping;HE Junhua;MA Lijing;College of Horticulture,Northwest A&F University;  
【Objective】This study evaluated the occurrence of gray mold and resistance related indexes of postharvest apples treated by salicylic acid(SA)to research induced resistance mechanism of SA treatment and provide basis for the control of apple postharvest diseases.【Method】Apple fruits were dipped at 150 mg/L SA for 20 minutes before being inoculated with conidial suspension of Botrytis cinerea after two days storage at room temperature.The control was treated with distilled water.Incidence and lesion diameter,the activities of peroxidase,polyphenol oxidase,phenylalanine ammonia-lyase,chitinase,and β-1,3-glucanase,and contents of total phenolic compounds,flavonoids and MDA were measured after inoculation.【Result】Compared to the control,SA treatment effectively reduced the incidence and inhibited the expansion of lesion diameters of apple fruits after inoculation.At the earlier days,SA treatment significantly weakened the development of disease(P0.05).The activities of POD,PPO,and PAL,and activities of resistance related proteins of CHI and GLU were promoted remarkably by SA treatment.The synthesis and accumulation of total phenolic compounds and flavonoids were induced,while MDA content was decreased by SA treatment.【Conclusion】The application of SA enhanced resistance to gray mold by heightening de-fense enzymes,increasing resistance related protein activities and the content of substances related to resistance,and reducing the degree of membrane lipid peroxidation.
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