用电阻法测定不同抗性的小麦叶组织对麦根腐长蠕孢(Helminthosporium sativum)毒素制备物的电阻变化,可以获得与在自然条件下用病原菌孢子接种鉴定一致的结果.它与通常表示膜伤害程度的电解质外渗密切相关,并能与小麦叶片可见的病害症状和小麦品种间的阶段抗病性相对应. 实验结果表明:小麦抽穗期到乳熟期的电阻值大小与小麦品种对毒素抗性呈正相关. 反映叶组织抗性的电阻大小,除与毒素致病特性有关外,还与小麦本身的生长发育状况、叶龄、部位、组织含水量等有关. 小麦对病菌及其毒素制备物的抗性与电阻动态变化关系的一致性,可以应用于品种的抗病性鉴定.表达品种抗性的电阻值大小,可以用电阻值的比值来表示. Resistance changes of different resistant wheat leaf tissues to Helminthosporium sativum toxin preparations were determined by resistance method to obtain consistent results with inoculation of pathogen spores under natural conditions. Electrolyte extravasation is closely related to injury degree and can be related to the disease symptoms visible to wheat leaves and stage disease resistance among wheat cultivars.The experimental results show that the resistance value between wheat heading stage and milk ripening stage is similar to that between wheat cultivars and toxins Resistance was positively correlated with resistance to leaf tissue resistance size, in addition to the pathogenicity of toxins, but also with the growth and development of wheat itself, leaf age, location, tissue water content, etc. Wheat germs and their toxins The consistency between the resistance of the material and the dynamic change of the resistance can be applied to the identification of the disease resistance of the variety, and the resistance value of the resistance of the expression variety can be expressed by the ratio of the resistance value.