Abstract:

The toxin-generated conditions and the pathogenicity mechanism of Cercospora zeae-maydis have been studied in this article. The mensuration of conductivity method was used to examine the effects of C. zeae-maydis toxins statically cultured in the Fries nutrient fluid under different temperature and different time on the conductivity of maize leaves in vitro. The results showed that as processing time prolongs, the conductivity increasing rates on maize leaves in vitro decreases when treated with the C.zeae-maydis toxins (at the concentration of 25% ) cultivated under the same temperature and the same time. Toxins cultivated under different temperature and different time both has a remarkable influence on the conductivity of maize leaves in vitro. This indicated that toxins statically cultured in the Fries nutrient fluid for 15 days under (20±1)℃ have the best effect on the conductivity of maize leaves in vitro.