The difference in toxicity of culture filtrates among the isolates of Pyricularia oryzae
1989
Chen Quanqing | Zhang Fanqin | Yin Liqin (Shanghai Municipal Academy of Agricultural Sciences, Shanghai (China). Inst. of Plant Protection)
Twenty isolates of Pyricularia oryzae cultured in potato sucrose solution were tested for toxicity of their culture filtrates by bioassay of rice radicle growth inhibition. Toxicity among the culture filtrates showed significant differences. According to the inhibitory effect of culture filtrates on the radicle growth, the isolates could be divided into 4 groups (I -IV) whose inhibitory effects were 7.7%, 18.4%, 62.5%, 100% (radicle growth rate), respectively. In addition, the toxicity of culture filtrates would decrease with the increase in mycelial growth and pigmentation of the toxigenic isolates.
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