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中国油料作物学报 ›› 2017, Vol. 39 ›› Issue (1): 99-.doi: 10.7505/j.issn.1007-9084.2017.01.015

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Infectious condition of Sphaceloma arachidis and physiological responses to pathogen infection in peanut

  

  1. Plant Protection College, Shenyang Agricultural University, Shenyang 110866, China
  • Online:2017-02-28 Published:2017-05-08

Abstract:

 Peanut scab caused by Sphaceloma arachidis is one of the important leaf diseases of peanut, distributed widely in major peanut production areas in China. In order to explore the mechanism and role of host defensive enzymes in plant-pathogen interaction, the infectious condition of S. arachidis and the dynamic changes of defense enzymes activity in different resistance peanut varieties were investigated. The results showed the incubation period of peanut scab was 120h in susceptible variety Baisha 1016 at 25°C-30°C, was 240h at 15°C. Infection ability of fungi had significant positive correlation with time in moist chamber. The shortest time in moist chamber was about 4h. The optimum condition for infection was 25-30°C and 42-48h in moist chamber respectively. Infection ability of S. arachidis had negative correlation with their culture time. Activities of defense enzymes including phenylalanine ammonia-lyase, peroxidase, polyphenol oxidase, superoxide dismutase and catalase in two peanut varieties all increased after inoculation and then decreased. Enzymes activities in resistant varieties (Fuhua 17) peaked at 24 to 36h post inoculation while in Baisha 1016 was at 48 to 72h post inoculation. The disease severity and infection index of Baisha 1016 were significantly higher than that of Fuhua 17 infected with S. arachidis. 

Key words:  Arachis hypogaea, Sphaceloma arachidis, infection, resistance, host defensive enzymes