Cultivar disease resistance ratings to nodorum blotch (caused by Parastagonospora nodorum) provide critical information to growers to assist with disease management. However, less has been done in terms of yield losses from diseases under different cultivar resistance scenarios. The purpose of this study was to characterize yield and quality loss responses to wheat nodorum blotch as influenced by variety partial resistance, epidemic intensity, and environment. The trial series includes four site/years in Western Australia. Five varieties, Magenta, Calingiri, Trojan, Janz, and Scout were used for all four trials. These varieties represented resistant/susceptible categories MRMS, MS, MSS, S, and SVS, respectively, and were selected on the basis that they were adapted to the western region, had similar maturities, and were resistant to diseases that were potential contaminants. Trials were sown in a strip‐plot design with three replicates and five disease levels, with intersecting main‐plots of varieties and disease levels, which facilitated comparisons across disease levels within varieties. Current categories of resistance were well reflected in yield and quality responses. A negative exponential relationship was observed between yield and disease, with a nonlinear yield loss function for both flag leaf and glume infection. This indicates that yield is most affected during early stages of disease on flag leaves and glumes. The functional form of yield loss response over four site years was similar among varieties, but varieties differed in their extent of disease expression. Partial resistance in commercial wheat varieties reduced yield loss by 40%–60% of losses observed in susceptible varieties.

中文翻译：

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品种抗性对小麦去瘤斑的产量损失功能的影响

品种对Nodorum斑点的抗病性等级（由Nostum parastagonospora引起）向种植者提供重要信息，以协助疾病管理。但是，就不同品种抗性情况下疾病的产量损失而言，所做的工作很少。这项研究的目的是表征受部分偏抗性，流行强度和环境影响的小麦结节斑点病的产量和品质损失响应。该试用系列包括在西澳大利亚州的四个站点/年。所有四个试验均使用了洋红色，卡林吉里，特洛伊木马，扬兹和侦察兵这五个品种。这些品种分别代表了抗药性/易感性类别MRMS，MS，MSS，S和SVS，并且根据它们适应西部地区，具有相似的成熟度并且对潜在污染物的疾病具有抗性而被选中。试验以带状图设计进行，该设计具有三个重复样本和五个疾病级别，并且与品种和疾病级别相交的主图相交，这有利于在品种内对疾病级别进行比较。当前的抗性类别在产量和质量响应中得到了很好的体现。在产量和疾病之间观察到负指数关系，对于剑叶和颖花感染均具有非线性产量损失函数。这表明在疾病的早期，旗叶和颖间产量受最大影响。品种之间四个位点的产量损失响应的功能形式在品种之间相似，但是品种在疾病表达上的程度有所不同。商业小麦品种的部分抗性使易感品种的单产下降了40％–60％。