Abstract：This paper investigates the attenuation mechanism of parsley rotten root extract on Fusarium oxysporum f. sp. cucumerinum (Foc.). Foc. was treated from the first to fifth generation with parsley rotten root extract prepared by ethanol, acetone, and distilled water. The excretive fusarium acid content and cell wall degradation enzyme activity were detected and their correlation with pathogenicity was studied. The results show that the pathogen's fusarium acid content and pectinase enzyme activity were significantly reduced with the increase of treated generations, the cellulose enzyme activity had no apparent change with the increase of treated generations, and the β-glycosidase enzyme activity increased with the increase of treated generations, but all were lower than those in the control group. Correlation analysis shows that there are significant or extremely significant positive correlation between pathogenicity and the pathogen's fusarium acid content, pectinase enzyme activity, and β-glycosidase enzyme activity, but there is no clear relationship between pathogenicity and the cellulose enzyme activity.
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2014, Vol. 32 
