QTL Mapping for Adult-Plant Resistance to Stripe Rust in a Common Wheat RIL Population Derived from Chuanmai 32/Chuanyu 12

QTL Mapping for Adult-Plant Resistance to Stripe Rust in a Common Wheat RIL Population Derived from Chuanmai 32/Chuanyu 12

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Stripe rust, caused by Puccinia striiformis f.sp.tritici, is a devastating wheat disease worldwide.

The Chinese wheat cultivar Chuanmai 32 has shown stable resistance to stripe rust for 10 yr in Sichuan Province, a hotspot for stripe rust epidemics.The objective of the present study was to map quantitative trait loci (QTL) for adult-plant resistance (APR) to stripe rust in a population of 140 recombinant inbred lines berness white sneakers (RILs) derived from Chuanmai 32/Chuanyu 12.Field trials were conducted in Chengdu and Yaan, Sichuan, from 2005 to 2008, providing stripe rust reaction data for 6 environments.

797 simple sequence repeat (SSR) markers were screened for association with stripe rust reaction, initially through bulked segregant analysis (BSA).Based on the mean disease values averaged across environments, the broad-sense heritability biomat for sale of maximum disease severity (MDS) was 0.75.

Two QTLs for stripe rust resistance were detected by composite interval mapping (CIM).They were designated QYr.caas-3BL and QYr.

caas-3BS and explained from 6.6 to 20.1%, respectively, of the phenotypic variance across environments.

QYr.caas-3BL came from Chuanmai 32; QYr.caas-3BS with lower effect was from the susceptible parent Chuanyu 12.

Both QTLs appear to be new.