重要抗源京核8811品系抗小麦条锈病主效基因的单体分析

Monosomic Analysis of Resistance to Stripe Rust for Source Wheat Line Jinghe 8811

采用单体分析技术 ,用中国小麦条锈菌优势小种 CY31和埃塞俄比亚菌系 35E134的单孢菌系对重要抗源京核 8811品系进行抗条锈基因分析及定位。结果表明 :京核 8811含有抗 35E134菌系、位于 2 A染色体上和抗 CY31菌系、位于 4 D染色体上的两对显性抗条锈基因 ,二者均控制 0 - 0 ;的侵染型。异同比较显示 ,定位基因不同于国际上已定名的抗条锈基因 ,谓之新基因 ,暂定名为 Yr Jh1和Yr Jh2。 Yr Jh2具有比 Yr Jh1更宽的抗性谱 ,二者同时存在 ,使京核 8811具有较强的抗条锈性 ,抗中国目前所有小种 。

Monosomic analysis of wheat line Jinghe 8811 for resistance to Puccinia striiformis West. pathotype CY31 and 35E134, which were from China and Ethiopia, respectively, was carried out. The results showed that two dominant resistant major genes existed in Jinghe 8811. One was located on chromosome 2A and conferred resistance to pathotype 35E134, the other located on chromosome 4D and resistance to pathotype CY31, and all controlled 0-0 ; infection types (IT). The two genes were different from named genes. We called them YrJh1 and YrJh2 temporarily. The resistance spectrum of YrJh2 was wider than that of YrJh1 , thus Jinghe 8811 has high resistance to Puccinia striiformis West. and can be effectively used in breeding.