Adult plant and seedling resistance to powdery mildew in a Triticum aestivum x Triticum militinae hybrid line.
In the progeny of a cross between the common wheat cultivar Tähti and Triticum militinae, a member of the timopheevii group of tetraploid wheats, several hybrid lines were selected that are characterized by improved seedling and adult plant resistance (APR) to powdery mildew. An F2 single-seed descendant mapping population segregating for seedling resistance and APR to powdery mildew was analysed for the identification of quantitative trait loci (QTL). The main QTL responsible for APR was detected on the long arm of chromosome 4A tightly linked to the Xgwm160 locus on a T. militinae translocation explaining up to 54% of phenotypic variance. The same translocation influenced seedling resistance to powdery mildew upon inoculation of plants with a synthetic population of Blumeria graminis DC. f. sp. tritici, and explained 28-33% of the phenotypic variance.
Jakobson
Irena
I
Department of Gene Technology, Tallinn University of Technology, Akadeemia tee 15, 19086, Tallinn, Estonia. irena.jakobson@ttu.ee
Peusha
Hilma
H
Timofejeva
Ljudmilla
L
Järve
Kadri
K
D001203:Ascomycota / Q000145:classification / Q000235:genetics / Q000472:pathogenicity*; D002678:Chimera / Q000235:genetics*; D002874:Chromosome Mapping; D032461:Chromosomes, Plant / Q000235:genetics; D003433:Crosses, Genetic; D008040:Genetic Linkage; D005819:Genetic Markers; D007113:Immunity, Innate / Q000235:genetics*; D018895:Microsatellite Repeats; D010935:Plant Diseases / Q000235:genetics / Q000382:microbiology; D040641:Quantitative Trait Loci; D013172:Spores, Fungal / Q000145:classification / Q000302:isolation & purification / Q000472:pathogenicity; D014908:Triticum / Q000235:genetics* / Q000382:microbiology*; D014774:Virulence / Q000235:genetics
D005819:Genetic Markers