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用ＪＦ－１２菌株的子囊孢子接种５个不同程度抗感赤霉病的小麦品种，于不同时间对穗组织中脱氧雪腐镰刀菌烯醇（ＤＯＮ）的量进行了测定。结果表明：感病品种（宁麦６号及扬麦３号）穗中的ＤＯＮ量自接种后第４～８天迅速升高，最高可达３７．６４μｇ／ｇｄｗ），抗病品种（望水白）的ＤＯＮ含量较低（≤７．３５μｇ／ｇｄｗ），且自接种后第８天起逐渐下降，中抗（扬麦４号）和中感（宁８０２６）品种的ＤＯＮ含量居于抗、感病品种之间。ＤＯＮ含量与穗发病程度的相关性依品种不同而异，即在感病品种上两者有较显著的相关性（ｒ＝０．９０９～１．００），但在抗病及中抗品种上相关性不显著（ｒ＝０．４６６～０．５３１）。说明抗病品种可能存在降解ＤＯＮ的解毒机制。另外，所有供试品种均在接种后２４小时、尚未表现症状时即可检测到一定量（０．４６～２．４１μｇ／ｇｄｗ）的ＤＯＮ，表明ＤＯＮ可能在病菌与寄主建立寄生关系过程中有重要作用
Inoculation of 5 wheat cultivars with different degrees of resistance to Fusarium head blight was carried out with ascospore of JF-12 strain, and the amount of deoxynivalenol (DON) in the panicle tissue was determined at different times. The results showed that the DON level in susceptible varieties (Ningmai 6 and Yangmai 3) increased rapidly from 4 to 8 days after inoculation (up to 37.64μg / gdw), resistant varieties White) had lower DON content (≤7.35μg / gdw), and decreased gradually from day 8 after inoculation. The DON content of Zhongkang (Yangmai 4) and Zhonggan (Ning 8026) Diseases between varieties. The correlation between DON content and panicle morbidity varies according to breeds, that is, there is a significant correlation between DON content and susceptible varieties (r = 0.909-1.00) The correlation was not significant (r = 0.466 ~ 0.531). It suggested that there may be detoxification mechanism of degrading DON in resistant varieties. In addition, all tested cultivars could detect a certain amount (0.46 ~ 2.41μg / gdw) of DON at 24 hours after inoculation, indicating that DON may be in the process of establishing parasitic relationship between the pathogen and the host Important role