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首页> 外文期刊>The New Phytologist >Quantitative plant resistance in cultivar mixtures: wheat yellow rust as a modeling case study
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Quantitative plant resistance in cultivar mixtures: wheat yellow rust as a modeling case study

机译：品种混合物中的植物抗性定量研究：小麦黄锈病模拟案例研究

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摘要

Unlike qualitative plant resistance, which confers immunity to disease, quantitative resistance confers only a reduction in disease severity and this can be nonspecific. Consequently, the outcome of its deployment in cultivar mixtures is not easy to predict, as on the one hand it may reduce the heterogeneity of the mixture, but on the other it may induce competition between nonspecialized strains of the pathogen. To clarify the principles for the successful use of quantitative plant resistance in disease management, we built a parsimonious model describing the dynamics of competing pathogen strains spreading through a mixture of cultivars carrying nonspecific quantitative resistance. Using the parameterized model for a wheat-yellow rust system, we demonstrate that a more effective use of quantitative resistance in mixtures involves reinforcing the effect of the highly resistant cultivars rather than replacing them. We highlight the fact that the judicious deployment of the quantitative resistance in two- or three-component mixtures makes it possible to reduce disease severity using only small proportions of the highly resistant cultivar. Our results provide insights into the effects on pathogen dynamics of deploying quantitative plant resistance,and can provide guidance for choosing appropriate associations of cultivars and optimizing diversification strategies.
机译：与赋予对疾病的免疫力的定性植物抗性不同，定量抗性仅使疾病严重性降低，而这可能是非特异性的。因此，将其部署在栽培品种混合物中的结果并不容易预测，因为一方面，它可能会降低混合物的异质性，但另一方面，它可能会引起病原体非专业菌株之间的竞争。为了阐明在疾病管理中成功使用定量植物抗性的原理，我们建立了一个简化模型，描述了通过携带非特异性定量抗性的混合品种传播的竞争病原体菌株的动力学。使用小麦-黄锈病系统的参数化模型，我们证明了在混合物中更有效地使用定量抗性涉及增强高抗性品种的效果，而不是替代它们。我们强调了这样一个事实，即在两组分或三组分混合物中明智地部署定量抗性可以仅使用小比例的高抗性品种降低疾病的严重性。我们的结果为深入了解部署定量植物抗性对病原体动力学的影响提供了指导，并为选择合适的栽培品种协会和优化多样化策略提供指导。

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