3.褪绿点抗性这种抗性是来自非洲的自交系B1138T,主要表现在幼苗叶片上,但在田间成株期叶片上尚未见到有褪绿点抗性。当病菌孢子不论接种于抗病的或感病的玉米幼苗叶片上2—3天后,开始出现针头大的褪绿点,接种后经5周仍保持原来的大小,不扩大成大形病斑。经组织学研究证明幼苗叶片上接种的病菌孢子均能正常地萌发 3. Resistance to chlorotic spots This resistance is derived from the inbred line B1138T in Africa and is mainly found on seedling leaves, but there is no resistance to chlorotic spots on adult leaves in the field. When the spores were inoculated on resistant or susceptible leaves of maize seedlings for 2-3 days, large needle chlorotic spots began to appear. After 5 weeks of inoculation, the spores maintained their original size and did not expand into large shaped lesions. Histological studies have shown that seedling spores on the seedlings can be normal germination