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2003~2004年度和2004~2005年度在田间测定了16个小麦品种(系)对小麦白粉菌E20菌株的抗性组分,包括潜育期、侵染几率、产孢量、病斑扩展和传染期。结果表明,小麦慢白粉品种(系)与高感对照品种相比,表现为潜育期长、侵染几率低、产孢量低、病斑扩展慢的特点,且这4个抗性组分与对照的差异都达到了显著和极显著水平,但慢白粉品种的传染期变化无一定规律。参试慢白粉品种的抗性组分参数与病情曲线下面积(AUDPC)的相关分析表明,潜育期与AUDPC呈负相关,但相关性不显著;产孢量和病斑扩展与AUDPC呈正相关,两年数据相关性均达到显著水平;侵染几率与AUDPC呈正相关,但2003~2004年度相关性不显著,而2004~2005年度相关性显著;传染期与AUDPC相关关系不明显。由此可见,在慢白粉品种的病害流行中起主要作用的是产孢量、病斑扩展,而侵染几率、潜育期和传染期作用相对较小。
The resistance components of 16 wheat cultivars (lines) to the powdery mildew of the wheat powdery mildew strain E20 were determined in the field from 2003 to 2004 and from 2004 to 2005, including the incubation period, the infection probability, the sporulation quantity, the spread and spread of the lesion period. The results showed that compared with the high susceptible varieties, the cultivars of slow-white wheat showed the characteristics of long latent period, low infection rate, low spore yield and slow spread of the lesion, and the four resistant components Differences with the control reached significant and extremely significant level, but the slow white powder varieties of infection period changes without certain rules. Correlation analysis between parameters of resistance cultivars and areas under curve (AUDPC) indicated that the incubation period was negatively correlated with AUDPC, but the correlation was not significant. Sporulation and lesion expansion were positively correlated with AUDPC , The correlation between two years reached a significant level; the incidence of infection was positively correlated with AUDPC, but the correlation was not significant from 2003 to 2004, but significant between 2004 and 2005; the correlation between infection and AUDPC was not obvious. Thus, in the slow white powder disease epidemic play a major role in the sporulation rate, lesion expansion, and the probability of infection, latent period and the role of infection is relatively small.