玉米小斑病菌CI小种侵染特征的病理指标比较研究

试验选用１１套同核异质材料，采用田间鉴定与室内鉴定相结合的方法，依据寄主细胞、组织、个体、群体对ＣＩ小种不同反映，分别对ＨＭＣＩ毒素对玉米根冠细胞致死率、针刺病斑长度、幼根生长抑制率、乳熟期病斑长度和面积、接种２０ｄ及乳熟期病情指数７个病理指标进行了比较研究与筛选。结果表明：（１）乳熟期病斑面积可以作为测定寄主对Ｃ中抗性的单一病理指标；（２）确定了综合评价寄主对ＣＩ小种及其毒素综合抗生的３个主万分

A Comparative Analysis of Different Pathological Traits of the Infective Characters of Helminthosporium Maydis Race CI

In the experiment 11 different genotypes in Cms Rb(Bb),Cms C,Cms Es and normal cytoplasms were used,field test was combined with laboratory test,and the seven pathological traits such as the mortality rate of root cap cell,the lesion area and length,etc.,were investigated,analysised and compared with each other,The recults are as follows:(1)The lesion area can be taken as the only pathological trait to review the resistance of maize to Hel.may disrace CI;(2)Three comprehensive coefficients to review the multiple resistance of maize to Hel.maydis race CI and HMCI torin have been determineel;(3)The mortality rate of root cap cell may act as an indicator to detect the activity of HMCI toxin and the rind of new male sterile cytoplasms.