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稻白叶枯病菌在人工培养基上毒性降低受多种因素的影响。试验结果表明,营养因素对菌的毒性降低比菌的不同保存方法更为明显,在供试的6种常用培养基中,NA 和 PSA 培养基对菌的毒性降低影响较小。较短的移植间隔期和频繁的移植次数也会影响菌的毒性降低。菌对低浓度氧的敏感性可因菌系而有差异。因此认为冰冻真空干燥和低温保存对抑制菌的毒性降低是较为理想的保存办法。试验还表明粘多糖的产生与菌的毒性之间不存在一定的相关性。
The reduction of the toxicity of rice leaf blight on artificial medium is affected by many factors. The results showed that the toxicity of the nutritional factors on the bacteria is more obvious than that of the different preservation methods. Among the six commonly used media tested, the NA and PSA media had little effect on the reduction of the toxicity of the bacteria. Shorter transplant intervals and frequent transplants also affect the reduction in bacterial toxicity. The sensitivity of bacteria to low concentrations of oxygen may vary depending on the strain. So that the vacuum freeze-drying and low temperature storage to inhibit the toxicity of bacteria is a more ideal preservation. The experiment also showed that there is no certain correlation between the production of mucopolysaccharides and the toxicity of the bacteria.