小麦条锈菌鉴别寄主尤皮Ⅱ号抗条锈性遗传分析

小麦品种尤皮Ⅱ号是重要的中国小麦条锈菌鉴别寄主.为研究尤皮Ⅱ号的抗条锈性遗传基础,将该品种分别与感病品种铭贤169及其它抗病品种杂交,获得各组合的F1、BC1和F2代群体.在温室对各组合亲本及F1、BC1和F2代群体进行了苗期抗性鉴定.结果表明,尤皮Ⅱ号对CY29菌系的抗性由两对隐性基因独立或重叠遗传控制;对CY23的抗性由两对显性基因互补遗传控制;对CY31的抗性亦由两对显性基因互补遗传控制,而对Su-1的抗性则由一对显性基因控制.抗CY29的两对基因不抗CY23、CY31和Su-1,因此将这两对基因暂定名为YrJu1和YrJu2.抗CY23的两对基因中,其中一对同时抗CY31和Su-1,该基因与Spaldings prolific中的一对基因等位或紧密连锁,将该基因暂定名为YrJu3;另一对则与抗引655中的一对抗性基因等位或紧密连锁,暂定名为YrJu4.YrJu1、YrJu2、YrJu3和YrJu4均与其它供试品种中的已知抗性基因不同.

Inheritance of stripe rust resistance in wheat cultivar Jubeljna Ⅱ

To determine the genetic basis of stripe rust resistance,Jubilejna II,a wheat culti-var used to differentiate races of Puccinia striiformis in China,was crossed with a stripe rustsusceptible cultivar Mingxian169 and the cultivars with genes for resistance to the disease.Seedlings of the parents and F_1,F_2,and BC_1 progeny were evaluated for resistance to Chinesepathotypes or races of P.striiformis.Results showed that Jubilejna II has two recessive genesfor resistance to race CY29,two dominant genes for resistance to race CY23 and CY31,andone dominant gene for resistance to pathotype Su-1.The genes that confer resistance to raceCY29 do not confer resistance to CY23,CY31 and Su-1,which are named as YrJul and Yr-Ju2,respectively.There is a common gene,which confers resistance to CY23,CY31 and Su-1,and this gene is allele or closely linked to the gene in Spaldings prolific that is named as Yr-Ju3.Another gene conferring resistance to CY23 is allele or closely linked to the gene in Kan-gyin 655 and is named as YrJu4.