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中国玉米小斑病菌(Bipolaris maydis)小种培养滤液含有活性较强的生理活性物质,对供试15个自交系种子根生长具有明显的抑制作用;可诱导幼苗和离体叶片产生典型的小斑病症状,自交系对培养滤液致病作用的抵抗性与幼苗对病菌的致病性密切相关;O小种培养滤液对玉米根冠细胞具有强烈的致死作用,根冠细胞对培养滤液的敏感性与幼苗对病菌的感病性间存在明显的正相关。据此,初步认为O小种滤液中的生理活性物质为O毒素。
Bipolaris maydis culture filtrate contained strong activity of physiological active substances on the test of 15 inbred lines of seedling root growth was inhibited significantly; seedlings and leaves can induce the typical small Leaf spot symptom and resistance of the inbred lines to the pathogenicity of the culture filtrate were closely related to the pathogenicity of the seedlings to the pathogenic bacteria. O-cut culture filtrate had a strong lethal effect on the root cap cells of the corn plants. Sensitivity and seedling on the pathogenic bacteria there is a clear positive correlation between. Based on this, it is preliminarily considered that the physiologically active substance in the O-minor filtrate is O-toxin.