Skip to main content
A Database for Triticeae and Avena
GSP: Genome Specific Primers
Query Data Types
Links to Related Sites
Agriculture and Agri-Food Canada (AAFC)
The Triticeae Toolbox
USDA-ARS Small Grains Genotyping Labs
U.S. Wheat and Barley Scab Initiative
Two Point Data
GrainGenes Trait Study Report: Tan spot, Faris95
Tan spot, Faris95
Pathogenic disease reaction
et al. (1997) RFLP mapping of resistance to chlorosis induction by Pyrenophora tritici-repentis in wheat.
Theoretical and Applied Genetics
Trials were conducted in 1994 and 1995, all under greenhouse conditions. Seedlings at the third leaf stage were inoculated in a settling tower with Pyrenophora tritici-repentis isolate Pti2 at a conidia concentration of 3000 spores/ml.
This isolate is (nec+ chl+), which means it is an inducer of tan necrosis and extensive chlorosis. This population segregated for resistance to chlorosis only. The entire population, including both parents, was resistant to tan necrosis.
Plants were scored for reaction to tan spot in two ways: lesion type and percent leaf area diseased. The data are the means of six replicate inoculations, three in 1994 and three in 1995.
Lesion types were rated on a scale from 1 to 5 with 1 being the most resistant and 5 being the most susceptible.
Altar84/Ae. squarrosa (219) CIGM86.940
Lesion type = 1.2; Percent disease = 5
Opata M 85
Lesion type = 4.2; Percent disease = 45
Wheat, Synthetic x Opata
F7 recombinant inbreds
QTL Analysis Method
A subset of 532 markers, all mapping at an LOD of 2.0 or greater, was used for the QTL analysis.
Tan spot, Faris95, % Leaf area
Tan spot, Faris95, Lesion type