Scientia Agricultura Sinica ›› 2006, Vol. 39 ›› Issue (05): 935-940 .

• PLANT PROTECTION • Previous Articles     Next Articles

The Relationship Between BTH-Induced Resistance to Downy Mildew in Cucumber Seedlings and Content of HRGP and Lignin in Cell Wall

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  1. 西北农林科技大学园艺学院
  • Received:2005-04-06 Revised:1900-01-01 Online:2006-05-10 Published:2006-05-10

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Abstract: 【Objective】 The relationship between the activity of phenylalanine ammonia lyase (PAL) or proxidase (POD) and the content of hydroxyproline-rich glycoprotein (HRGP) or lignin and benzothiadiazole (BTH) induced resistance to downy mildew in cucumber seedlings was studied. 【Method】Cucumber seedlings at two-leaf stage were inoculated with spores of Pseudoperonospora cubensis f.sp.cucumerinum before or after treated with BTH. The activities of PAL and POD and the contents of HRGP and Lignin were measured with colorimetric method in the following days. 【Result】BTH treatment not only enhanced the resistance of seedlings to downy mildew, but also increased both enzyme activities and the contents of HRGP and lignin. The accumulation of HRGP and the deposition of lignin synchronized in cucumber leaves after infection of Psedoperonospora cubensis. 【Conclusion】The results suggest that the accumulation of HRGP and the deposition of lignin in cell wall are related to resistant reaction of cucumber to downy mildew, and it is considered a biochemical response of cucumber to downy mildew.

Key words: BTH, Cucumber downy mildew (Pseudoperonospora cubensis f.sp.cucumerinum), PAL, POD, HRGP, Lignin

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