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春小麦品种青春221抗叶锈性遗传分析

, PP. 20-26

Keywords: 小麦,青春221,叶锈病,遗传分析

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Abstract:

为明确青春221中抗叶锈病基因的有效性及其遗传机制,以青春221为父本,分别与感病品种铭贤169和Thatcher以及小麦抗叶锈病近等基因系Lr1、Lr3和Lr23的载体品系杂交,获得F1、F2和F3代群体后,分别在苗期和成株期进行抗病性测定。苗期,青春221对致病类型FGJ/QP、SHJ/GN和PHT/RP的抗病性分别由显性抗叶锈病基因Lr1、Lr3和Lr23控制,对致病类型BGD/HL的抗病性则由上述3对显性抗病基因独立或重叠作用控制,与Thatcher杂交后,青春221中的Lr23趋于隐性遗传并被Thatcher中的1对显性抑制基因抑制;成株期,青春221对优势致病类型PHT/RP和THT/TP混合菌种的抗病性由显性抗叶锈病基因Lr23控制,而Lr1和Lr3均不起作用。

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