Yellow rust, caused by Puccinia striiformis f. sp. tritici, is one of the most severe wheat disease worldwide. Crop losses have ranged from 10% to 70% and up to 100% in extreme conditions. Eighty‐two resistance genes, designated Yr, have been identified. Among them, Yr17 derived from Aegilops ventricosa and located on chromosome 2A has been widely used in wheat breeding. However, it had been overcome already. Through recombination of the Ae. ventricosa Yr17‐carrying 6N^v chromosome with 2D of wheat, we introduced Yr17 onto chromosome 2D. Then, lines carrying Yr17 on both 2A and 2D were generated. Seedlings of the latter, as well as those carrying a single dose of Yr17 either on 2A or on 2D, were inoculated with virulent or avirulent strains on wheat seedlings. The different genotypes were fully susceptible for the two pathotypes that are virulent on Yr17. In the case of avirulent pathotypes, the Yr17 double dose lines were fully resistant, while those with the Yr17 gene only on either 2A or 2D had intermediate resistance reactions towards one or the other or both pathotypes.

中文翻译：

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面包小麦品系抗黄锈基因Yr17的双剂量效率

黄锈病，由条锈菌引起。sp。小麦是世界上最严重的小麦疾病之一。作物损失在10％至70％的范围内，在极端条件下甚至高达100％。已经鉴定出八十二个抗性基因，称为Yr。其中，位于2A染色体上的源自Aegilops ventricosa的Yr17已广泛用于小麦育种。但是，它已经被克服了。通过重组Ae。带有2D小麦的ventricosa Yr17携带6N ^v染色体，我们将Yr17引入2D染色体。然后，携带Yr17的线在2A和2D上都生成了。将后者的幼苗以及在2A或2D上携带单剂量Yr17的幼苗接种有毒或无毒力的小麦幼苗。不同的基因型完全易受Yr17毒的两种病态。在无毒致病型的情况下，Yr17双剂量系完全耐药，而仅在2A或2D上具有Yr17基因的那些对一种或另一种或两种致病型均具有中等耐药性。