de Nooij Marianne P, van Damme Jos M M
Department of Dune Research "Weevers' Duin", Institute for Ecological Research, Duinzoom 20a, NL-3233 EG, Ootsoorne, The Netherlands.
Oecologia. 1988 May;75(4):535-538. doi: 10.1007/BF00776417.
Susceptibility toPhomopsis stalk disease ofPlantago lanceolata genotypes, sampled in three different populations with a variable degree of infection by the fungusPhomopsis subordinaria, was determined under greenhouse conditions. Susceptibility of the host varied within, but not among populations. No relationship between the intensity of the disease in the field and the mean susceptibility of the host genotypes sampled at those locations could be established. Host susceptibility appeared to be composed of the host genotypes sampled at those locations could be established. Host susceptibility appeared to be composed of different (uncorrelated) plant characteristics. Determining whether host genotypes are highly or slightly susceptible can only be achieved by field trials, where the plants are exposed to the whole set of disease inducing factors. The relevance of host susceptibility to the intensity of disease in the field is discussed in relation to the variation in pathogenicity of the fungus and the variation in environmental factors prevailing inP. lanceolata populations underP. subordinaria pathogen pressure.
在温室条件下，对三个不同种群中采集的、受亚隔拟茎点霉感染程度不同的窄叶车前草基因型对拟茎点霉茎腐病的易感性进行了测定。寄主的易感性在种群内部存在差异，但在种群之间没有差异。无法确定田间病害的严重程度与在这些地点采集的寄主基因型的平均易感性之间的关系。寄主易感性似乎由不同（不相关）的植物特征组成。只有通过田间试验，使植物暴露于整套致病因素下，才能确定寄主基因型是高度易感还是轻度易感。结合在亚隔拟茎点霉病原体压力下，窄叶车前草种群中真菌致病性的变化和环境因素的变化，讨论了寄主易感性与田间病害严重程度的相关性。
