Submitted to: American Society of Agronomy Meetings
Publication Type: Abstract only
Publication Acceptance Date: 11/6/2000
Publication Date: N/A
Citation: Interpretive Summary:
Technical Abstract: In oat (Avena sativa L.) the demonstrated ability of the crown rust pathogen Puccinia coronata f. sp. avenae to rapidly overcome high level race-specific host resistance has led to a strong interest in breeding oats with partial, race non-specific resistance. To characterize inheritance patterns and to identify molecular markers associated with this quantitatively inherited trait, a population consisting of 158 F6-derived recombinant inbred lines from a cross of an identified partial-resistance line 'MN841801-1' by a susceptible cultivar 'Noble-2' was mapped with 112 RFLP loci. A linkage map was constructed into 17 linkage groups and 23 unlinked loci. Disease resistance was evaluated on adult plants. Three partial-resistance QTLs, termed PRQ1, PRQ2, and PRQ3, were identified in field tests and explained 27% of the phenotypic variance. These QTLs were located on linkage groups C, P, and N, which putatively correspond to linkage groups 17, 36, and 22 in the 'Kanota' x 'Ogle' map. Two of these QTLs (PRQ1 and PRQ2) were also identified in greenhouse tests. This population is currently being screened and mapped with AFLPs to provide more extensive map coverage of the large hexaploid oat genome and to find possible additional QTLs and markers more tightly linked to current QTLs for use in marker-assisted selection for partial crown rust resistance.