Link to home

Identification of Quantitative Loci for Tolerance to Barley Yellow Dwarf Virus in Oat

May 1998 , Volume 88 , Number  5
Pages  410 - 415

Hua Jin , Leslie L. Domier , Frederic L. Kolb , and Charles M. Brown

First, second, third, and fourth authors: Department of Crop Sciences, University of Illinois, 1102 South Goodwin Avenue, Urbana 61801; second author: United States Department of Agriculture, Agricultural Research Service, Crop Protection Research Unit, 1102 South Goodwin Avenue, Urbana, IL 61801

Go to article:
Accepted for publication 15 January 1998.

Molecular markers linked to quantitative trait loci conditioning tolerance to barley yellow dwarf virus (BYDV) were identified in oat (Avena sativa) using amplified fragment length polymorphism (AFLP) analysis. Near-isogenic and recombinant inbred lines (NILs and RILs, respectively) derived from a cross of Clintland64 (BYDV-sensitive) and IL86-5698 (BYDV-tolerant) were evaluated for their responses to an Illinois isolate of the PAV strain of BYDV. Individual markers identified in the analysis of the NILs explained up to 35% of the variability seen in the tolerance response. Single-point analysis of the marker data from the RIL population identified 24 markers in three linkage groups that were associated with tolerance to BYDV infection at P ≤ 0.001. These markers defined three major loci, A, C, and E, that were contributed by the tolerant parent (IL86-5698) and explained 35.0, 20.6, and 17.0% of the variability, respectively. Three minor loci G, H1, and R) were identified at P ≤ 0.01. These loci were contributed by the sensitive parent (Clintland64) and explained 5.8, 5.6, and 5.6% of the variability, respectively. Interval analysis showed that only the loci A, C, and E are associated significantly with BYDV tolerance at log of the likelihood ratio ≥ 3.0. These loci explained about 50% total of the variation in BYDV tolerance in multimarker regression analysis in both years. The BYDV tolerance loci A, C, E, and R were mapped to hexaploid oat restriction fragment length polymorphism linkage groups 2, 8, 36, and 5, respectively, by analyzing the segregation of the AFLP markers in the Kanota × Ogle RIL population.

Additional keywords: comparative mapping .

The American Phytopathological Society, 1998