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首页> 外文期刊>International Journal of Molecular Sciences >Mapping of Powdery Mildew Resistance Gene pmCH89 in a Putative Wheat-Thinopyrum intermedium Introgression Line
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Mapping of Powdery Mildew Resistance Gene pmCH89 in a Putative Wheat-Thinopyrum intermedium Introgression Line

机译：小麦-Thinopyrum intermedium渗入系中抗白粉病基因pmCH89的定位

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摘要

Powdery mildew, caused by Blumeria graminis f. sp. tritici (Bgt), is a globally serious disease adversely affecting wheat production. The Bgt-resistant wheat breeding line CH09W89 was derived after backcrossing a Bgt resistant wheat-Thinopyrum intermedium partial amphiploid TAI7045 with susceptible wheat cultivars. At the seedling stage, CH09W89 exhibited immunity or high resistance to Bgt pathotypes E09, E20, E21, E23, E26, Bg1, and Bg2, similar to its donor line TAI7045 and Th. intermedium. No Th. intermedium chromatin was detected based on genomic in situ hybridization of mitotic chromosomes. To determine the mode of inheritance of the Bgt resistance and the chromosomal location of the resistance gene, CH09W89 was crossed with two susceptible wheat cultivars. The results of the genetic analysis showed that the adult resistance to Bgt E09 in CH09W89 was controlled by a single recessive gene, which was tentatively designated as pmCH89. Two polymorphic SSR markers, Xwmc310 and Xwmc125, were linked to the resistance gene with genetic distances 3.1 and 2.7 cM, respectively. Using the Chinese Spring aneuploid and deletion lines, the resistance gene and its linked markers were assigned to chromosome arm 4BL in the bin 0.68–0.78. Due to its unique position on chromosome 4BL, pmCH89 appears to be a new locus for resistance to powdery mildew. These results will be of benefit for improving powdery mildew resistance in wheat breeding programs.
机译：白粉病，由Blumeria graminis f。引起。 sp。 Tritici（Bgt）是一种严重影响小麦产量的全球性严重疾病。抗Bgt小麦育种品系CH09W89是将Bgt抗性小麦-Thinopyrum intermedium部分二倍体TAI7045与易感小麦品种回交后得到的。在苗期，CH09W89对Bgt型E09，E20，E21，E23，E26，Bg1和Bg2表现出免疫性或高抗性，类似于其供体系TAI7045和Th。中间的。没有基于有丝分裂染色体的基因组原位杂交检测中间染色质。为了确定Bgt抗性的遗传模式和抗性基因的染色体位置，将CH09W89与两个易感小麦品种杂交。遗传分析结果表明，CH09W89中成虫对Bgt E09的抗性由单个隐性基因控制，暂定为pmCH89。两个多态性SSR标记，Xwmc310和Xwmc125，分别与遗传距离为3.1和2.7 cM的抗性基因连锁。利用中国春季非整倍体和缺失系，将抗性基因及其连锁标记分配到0.68-0.78位的4BL染色体臂上。由于其在4BL染色体上的独特位置，pmCH89似乎是抗白粉病的新基因座。这些结果将有助于提高小麦育种计划中的白粉病抗性。

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