Specific Loci for Adult-Plant Resistance to Stripe Rust in Wheat Founder Parent Fan 6 and Their Genetic Dissection in Its Derivatives
Fan 6 is one of the most important founder parents of common wheat in China.The objective of this study was to reveal the genetic structure of Fan 6 and the transmission of its specific loci for adult-plant resistance to stripe rust (Puccinia striiformis f.sp.tritici,Pst) in 39 derivatives.The resistance was evluated using 80 SSR markers assocated with the consensus QTLs for adult-plant resistance to Pst and the phenotypic assessment was conducted at seedling and adult stages after mixed inoculation with Pst races CYR31,CYR32,and CYR33.Fan 6 and seven derivatives showed resistance to Pst in the whole growth stage.Nine SSR allelles,Xwmc631,Xgwm359,Xwmc407,Xgwm501,Xgwm148,Xgwm539,Xgwm533,Xgwm299,and Xgwm639,were identified to be specific to Fan 6,of which Xwmc631,Xgwm359,Xgwm501,Xgwm299,and Xgwm639 exhibited high inheritability in the four derivate generations of Fan 6.The result of marker-trait association analysis showed that six SSR loci were significantly correlated with adult-plant resistance to Pst in Fan 6 and its derivatives.Among them,alleles from Fan 6 on loci Xgwm539 and Xgwm299 were responsible for disease severity,infection type,incidence,disease index,and area under the disease progress curve (AUDPC).These results indicated that the slow stripe-rusting resistance in Fan 6 has been intensively selected in breeding programs using Fan 6 as the founder parent,which will play an important role in Southwestern wheat area of China.
Fan 6Founder parentStripe rustAdult-plant resistanceAssociation analysis
国家科技期刊平台
NSTL
万方数据
维普
