春小麦品种沈免2063抗叶锈性遗传分析  

Genetic analysis for leaf rust resistance on spring wheat Shenmian 2063

作　　者：袁军海[1] 沈凤英[1] 吴伟刚[1] 张爱香[1] Yuan Junhai;Shen Fengying;Wu Weigang;Zhang Aixiang(Department of Plant Protection,Hebei North University,Xuanhua 075131,Hebei Province,China)

机构地区：[1]河北北方学院植物保护系,宣化075131

出　　处：《植物保护学报》2018年第4期804-811,共8页Journal of Plant Protection

基　　金：河北省自然科学基金(C2014405014);河北北方学院创新人才项目(CXRC1312)

摘　　要：为明确春小麦品种沈免2063所含抗叶锈病基因的对数、身份、显隐性和互作关系,以沈免2063为父本,分别与感病品种Thatcher及小麦抗叶锈病近等基因系Lr9、Lr19、Lr24、Lr25、Lr28、Lr42和Lr43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。结果表明:沈免2063含有3对显性遗传且相互独立作用的抗叶锈病基因Lr9、Lr19和Lr25,在苗期,沈免2063对致病类型CBG/QQ的抗病性由Lr9和Lr25控制,对PHT/RP的抗病性由上述3对抗叶锈病基因控制;在成株期,沈免2063对优势致病类型PHT/RP和THT/TP等比混合菌种的抗病性由上述3对抗叶锈病基因控制。Lr9、Lr19和Lr25在育成品种中出现频率很低,目前尚很有效,但这3个基因均为典型的垂直抗病性基因,应进行基因布局、基因轮换等科学组配,才能延长其使用寿命。The objective of this study was to determine the number, identity, dominant or recessive and interaction of leaf rust resistance genes in spring wheat Shenmian 2063. Shenmian 2063 was used as the pollen parent and crossed with the leaf rust susceptible cultivar Thatcher and Thatcher backcross lines near-isogenic for leaf rust resistance genes Lr9, Lr19, Lr24, Lr25, Lr28, Lr42 and Lr43 respectively.The F1, F2 and F3 plants were evaluated both as seedlings and at adult-plant stage with different pathotypes of Puccinia triticina that differed for virulence to specific leaf rust resistance genes. The results of inheritance and allelic verification indicated the presence of three dominant and independent genes Lr9, Lr19 and Lr25 in Shenmian 2063. Seedling plant leaf rust resistance of Shenmian 2063 to pathotype CBG/QQ was controlled by Lr9 and Lr25, while the combination of Lr9, Lr19 and Lr25 accounted for the resistance to pathotype PHT/RP. At adult-plant stage, all three leaf rust resistance genes was responsible for the effective field resistance to equal proportion mixing isolate of predominant pathotypes PHT/RP and THT/TP. Lr9, Lr19 and Lr25, typical vertical resistance genes for wheat leaf rust,are all very effective at present because of their low frequency in wheat cultivars in China, and rational rearrangement, such as proper redistribution and alternation, is essential to their resistance prolongation.

关 键 词：小麦 沈免2063 叶锈病 遗传分析 等位性验证 

分 类 号：S512.12[农业科学—作物学]