Physiological Changes of Cucumber after Being Infected by Clasosporium cucumerium and Production of Disease Resistance

doi:10.3321/j.issn:1000-7091.2003.03.020

Abstract

Abstract: Cucumber varieties with different disease resistance were inoculated by conidia of Cladosporium cucumerinum.The activity of peroxidase (POD), polyphenol oxidase (PPO) and phenylalanine ammonialyase (PAL), content of lignin, total phenol were investigated before and after inoculation. The results indicated that: no relationships were found between disease resistance with the enzyme activity, lignin content, total phenol content before inoculation; Variations of enzyme activity of POD, PPO and PAL were closely related to disease resistance of cucumber after inoculation. Enzyme activity of resistant variety increased earlier and much more intensively than that of the susceptible one. Variation of lignin content after inoculation was closely related with disease resistance of cucumber. In resistant variety, the maximum value of lignin content was appeared in 24 h after inoculation, whereas it appeared in 96 h after inoculation in susceptible one. More total phenol was produced in resistant variety than that of susceptible one after inoculation. Negative relationship was found between changes of total phenol content and changes of POD and PPO activity.

Key words: Cucumis sativus, Cladosporium cucumerinum, POD, PPO, PAL, Lignin, Total phenol

CLC Number:

S436.421.1

LI Shu-ju, MA De-hua, PANG Jin-an, HUO Zhen-rong. Physiological Changes of Cucumber after Being Infected by Clasosporium cucumerium and Production of Disease Resistance[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2003, 18(3): 74-77. doi: 10.3321/j.issn:1000-7091.2003.03.020.

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