Quantitative resistance (QR) to crop diseases has usually been much more durable than major-gene, effector-triggered resistance. It has been observed that the effectiveness of some QR has eroded as pathogens adapt to it, especially when deployment is extensive and epidemics occur regularly, but it generally declines more slowly than effector-triggered resistance. Changes in aggressiveness and specificity of diverse pathogens on cultivars with QR have been recorded, along with experimental data on fitness costs of pathogen adaptation to QR, but there is little information about molecular mechanisms of adaptation. Some QR has correlated or antagonistic effects on multiple diseases. Longitudinal data on cultivars' disease ratings in trials over several years can be used to assess the significance of QR for durable resistance in crops. It is argued that published data likely underreport the durability of QR, owing to publication bias. The implications of research on QR for plant breeding are discussed.

中文翻译：

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作物定量抗性的耐久性：大于我们所知道的吗？

对农作物疾病的定量抗性（QR）通常比主要基因，效应触发的抗性要持久得多。已经观察到，随着病原体的适应，某些QR的有效性受到侵蚀，特别是在广泛部署且流行定期发生的情况下，但它的下降通常比效应子触发的耐药性下降得更慢。已经记录了多种病原体在具有QR的品种上的侵略性和特异性的变化，以及有关病原体适应QR适应性成本的实验数据，但是关于适应的分子机制的信息很少。一些QR对多种疾病具有相关或拮抗作用。多年试验中有关品种疾病评级的纵向数据可用于评估QR对作物持久抗性的重要性。有人认为，由于发表偏见，已发表的数据可能未充分报导QR的持久性。讨论了QR研究对植物育种的意义。