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首页> 外文期刊>Plant Disease >Characterization of a Segregation Distortion Locus with Powdery Mildew Resistance in a Wheat-Thinopyrum intermedium Introgression Line WE99
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Characterization of a Segregation Distortion Locus with Powdery Mildew Resistance in a Wheat-Thinopyrum intermedium Introgression Line WE99

机译：小麦-Thinopyrum intermedium渗入系WE99中具有白粉病抗性的分离失真基因座的表征

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摘要

Exploitation of host resistance is important for controlling powdery mildew of wheat (Triticum aestivum L.). In this study, a wheat-Thinopyrum intermedium introgression line, designated WE99, conferred seedling resistance to 47 of 49 Blumeria graminis f. sp. tritici isolates. Genetic analysis demonstrated that the resistance segregation deviated significantly from a single gene Mendelian ratio. However, marker analysis indicated that only a single recessive resistance gene, temporarily designated PmWE99, conferred powdery mildew resistance (Pm). PmWE99 was mapped to chromosome arm 2BS and linked to the three simple sequence repeat markers Gwm148, Gwm271, and Barc55. Using race spectrum analysis, PmWE99 was shown to be significantly different from the documented genes Pm42 and MlIW170 located on chromosome arm 2BS and, thus, appeared to be a new Pm gene. Examination of the genotype frequencies in the F-2:3 families showed that a genetic variation in the PmWE99 interval that favored the transmission of the WE99 allele could be the cause of the deviated segregation. Further investigation revealed that the abnormal segregation only occurred at the PmWE99 interval and was not common at other loci in this population. Identification of PmWE99 will increase the diversity of the Pm genes for wheat improvement.
机译：利用宿主抗性对于控制小麦白粉病很重要。在这项研究中，小麦-Thinopyrum intermedium渗入系，命名为WE99，赋予49个Blumeria graminis f。中的47个幼苗抗性。 sp。小麦分离株。遗传分析表明，抗性分离与单个基因孟德尔比率有显着差异。但是，标记分析表明，只有一个隐性抗药性基因（临时命名为PmWE99）赋予白粉病抗性（Pm）。将PmWE99定位到2BS染色体臂上，并与三个简单的序列重复标记Gwm148，Gwm271和Barc55链接。使用种族谱分析，显示PmWE99与位于染色体臂2BS上的已记录基因Pm42和MlIW170显着不同，因此似乎是一个新的Pm基因。对F-2：3家族的基因型频率的检查表明，PmWE99区间的遗传变异有利于WE99等位基因的传播，这可能是导致偏分离的原因。进一步的调查显示，异常隔离仅在PmWE99间隔内发生，在该人群的其他基因座中并不常见。鉴定PmWE99将增加用于小麦改良的Pm基因的多样性。

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